When a protein molecule is generated as a complex of many polypeptide chains, the entire structure is referred to as the quaternary structure. The overall three-dimensional organization of a polypeptide chain.
What does a polypeptide chain look like?A polypeptide chain's structure is a linear arrangement of amino acids. Peptide bonds hold each amino acid to the one before it. In cells, there are 20 different kinds of amino acids. The core carbon of each amino acid is joined to an amino group, a carboxyl group, and a variable called the R group.
What protein possesses a tertiary structure?Proteins are frequently classified as globular or fibrous forms based on their tertiary structure. Fibrous proteins feature long, rope-like structures that are robust and hydrophobic, like -keratin. Immunoglobulins and plasma proteins are more hydrophilic and spherical than globular proteins.
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Which toxic substance is often used to extract gold and results in harmful environmental effects?
a. acid mine drainage
b. carbon dioxide
c. sulfur dioxide
d. cyanide
e. fluoride
Cyanide is the poisonous substance used to extract gold (d).
What is cyanide?The extraction of metals and electroplating are two industrial procedures that commonly involve the highly poisonous chemical compound cyanide. Sodium cyanide, potassium cyanide, hydrogen cyanide gas, potassium ferrocyanide, and ferricyanide salts are some of the different forms it can take.
Cyanide is a poisonous compound that is frequently used to extract gold and has a negative impact on the environment. In order to remove gold particles from ore, the very poisonous chemical cyanide is employed in the gold mining process. Despite its effectiveness, cyanide leaking can have negative impacts on the ecosystem and neighboring plants and animals. Animal and fish deaths as well as contaminated water sources have been connected to cyanide releases from mining operations.
In addition, chronic exposure to low concentrations of cyanide can harm human health and result in headaches, vertigo, and nausea. Despite the fact that many nations have laws governing the use of cyanide in gold mining, its widespread usage and a lack of effective management and containment techniques continue to raise concerns.
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6. vinegar is a solution of acetic acid, ch3cooh (60.05 g/mol), dissolved in water. it can be neutralized by ca(oh)2. if it took 30.10 ml of 0.100 m ca(oh)2 solution to react with all of the acetic acid in 11.1 g of vinegar, what is the mass percent of acetic acid in the vinegar
The vinegar is a solution of the acetic acid with the molar mass of 60.05 g/mol . The mass percent of the acetic acid in the vinegar is 3.33 %.
The chemical equation is :
2CH₃COOH + Ca(OH)₂ ----> Ca(CH₃COO)₂ + 2H₂O
The molarity of Ca(OH)₂ = 0.100 M
The volume of Ca(OH)₂ = 0.03110 L
The number of moles = molarity × volume
= 0.100 × 0.03110
= 0.00311 mol
The moles of acetic acid = 2 × 0.00311
= 0.0062 mol
The mass of the acetic acid = moles × molar mass
= 0.0062 × 60.05
= 0.37 g
The mass of the vinegar = 11.1 g
The mass percent of acetic acid = (0.37 / 11.1 ) × 100 %
= 3.33 %
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If we triple the number of moles in the gas vessel at constant pressure, what would the new volume be?Group of answer choicesa. 40 Lb. 20 Lc. 10 Ld. 30 L
We may infer that the new number of moles was tripled, therefore our assumption is sound. 30 L is the same as the new volume.
To determine the factor, the final volume will be divided by the initial volume. As a result, when the amount of gas triples in moles, the volume also triples. The volume will quadruple when the amount of gas is increased by three times. According to Boyle's law, a gas's volume and pressure are inversely related. We therefore anticipate a 13-fold drop in volume at constant temperature if the pressure increases by a factor of 3 (tripled).
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a 3.8 g sample of sodium hydrogen carbonate is added to a solution of acetic acid weighing 10.5 g. the two substances react, releasing carbon dioxide gas to the atmosphere. after the reaction, the contents of the reaction vessel weigh 12.0 g. what is the mass of carbon dioxide released during the reaction?
Given: mass of sodium hydrogen carbonate = 3.8 g
mass of acetic acid = 10.5 g
Mass of reactants = mass of sodium hydrogen carbonate & mass of acetic acid = 3.8 + 10.5 = 14.3 g
Mass of reactants = Mass of products in reaction vessel + mass of carbon dioxide (as it escapes)
Mass of carbon dioxide = 14.3 - 12.0 =2.3 g
Thus the mass of carbon dioxide released during the reaction is 2.3
Mass cannot be created or destroyed, under the law of conservation of mass. As a result, the mass of reactants and products must be equal. Each element must have an equal number of atoms on both the reactant and product sides of the reaction. Chemical equations are balanced as a result.
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you are given an irregularly shaped lump of a material and determine that it has a mass of 16.9245 g. when placed in a graduated cylinder that initially contains exactly 20.00 ml of water, the water level rises to 29.73 ml. what is the density of the unknown material? (show all your calculations.)
The density of the unknown material is approximately 1.74 g/cc
To find the density of the unknown material, we need to first calculate its volume. We can do this by finding the volume of the water that was displaced by the lump. The volume of the displaced water is given by the difference in volume of water in the cylinder before and after adding the lump.
The volume of the displaced water is equal to the final volume of water in the cylinder minus the initial volume of water in the cylinder:
V = 29.73 ml - 20.00 ml
=> 9.73 ml
Next, we'll convert the volume from milliliters to cubic centimeters (cc) since the density of the unknown material is usually expressed in g/cc:
V = 9.73 ml x (1 cc/1 ml)
=> 9.73 cc
Finally, we can calculate the density of the unknown material by dividing its mass by its volume:
density = mass / volume
density = 16.9245 g / 9.73 cc
density = 1.74 g/cc
So the density of the unknown material is approximately 1.74 g/cc.
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how much water should be added to 1 gallon of pure antifreeze to obtain a solution that is 95% antifreeze
Answer:
0.0526 gallons
Explanation:
Here is another way to set up the solution. (It will give the same answer as Michael's solution.) w = number of gallons of pure waterYou have 1 gallon of pure antifreezeYou want 95% antifreeze in 1+w gallons You can do a weighted combination of concentrations of antifreeze. (0%)(w) + (100%)(1) = (95%)(1 + w) 100 = 95(1 + w) w = 100/95 - 1 ≅ 0.0526 gallons
what is the predominant intermolecular force in the liquid state of each of these compounds: ammonia ( nh3 ), carbon tetrabromide ( cbr4 ), and methyl chloride ( ch3cl )?
Part-A
In the liquid form of NH[tex]_{3}[/tex], hydrogen bonding is the main force.
The main forces in the dispersion forces of CBr4
Dipole-dipole forces are the most common types of forces in CH[tex]_{3}[/tex]CL.
Part B:
The compounds' boiling points are listed in decreasing order.
NaF > CH[tex]_{2}[/tex]O > C[tex]_{2}[/tex]H[tex]_{2}[/tex] gas (less boiling point)
These are ionic chemicals :. (more boiling point)
A chemical compound is any material that consists of identical molecules having atoms from two or more different chemical elements.
Atoms from more than 100 different chemical elements, both in their pure forms and when mixed to form chemical compounds, make up all matter in the universe.
Only the atoms that are unique to that element are present in a pure element sample, and each element has its own unique atoms. For instance, the atoms that make up carbon differ from those that make up iron, which differ from those that make up gold. Every element has a distinctive symbol that is made up of one, two, or three letters that either come from the element's present name or from its original (typically Latin) name.
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Q) Part A:
What is the predominant intermolecular force in the liquid state of each of these compounds: ammonia (NH3 ), carbon tetrabromide (CBr4 ), and methyl chloride (CH3Cl )?? [options: dipole-dipole forces, hydrogen bonding, or dispersion forces]
Part B:
Rank the following compounds in order of decreasing boiling point: sodium fluoride (NaF ), acetylene (C2H2 ), and formaldehyde (CH2O )
How many moles of carbon dioxide would be contained in 6.0 L at 132.0 kPa and 47°C?
2 moles of carbon dioxide would be contained in 6.0 L at 132.0 kPa and 47°C. This law is a generalization that includes both Boyle's and Charles' laws.
What is ideal gas?The ideal gas, sometimes known as the perfect gas, is a gas that, in physical behavior, corresponds to a certain idealized connection between pressure, volume, speed temperature known as the perfect, or general, gas law.
This law is a generalization that includes both Boyle's and Charles' laws as special instances, and it asserts that for a given quantity of gas, the product of volume V and pressure P is proportional to absolute temperature T; that is, PV = kT, where k is a constant. This type of relationship for a material is known as its equation of state, and it is adequate to define its gross behavior.
P×V= n×R×T
substituting all the given values in the above equation, we get
132.0×6.0 = n×8.314×47
n = 2 moles
Therefore, 2 moles of carbon dioxide would be contained in 6.0 L at 132.0 kPa and 47°C.
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A tank of compressed helium contains 50.0 g helium. How many moles of helium are in the tank?
A tank of compressed helium contains 50.0 g helium. 12.49 moles of helium are in the tank.
What do you mean by mole ?The term mole is defined as the amount of substance of a system which contains as many elementary entities.
One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.
The mole concept can be used to convert between mass and number of particles.
Number of moles = Mass / molar mass
= 50.0 / 4.003
= 12.49 moles
Thus, A tank of compressed helium contains 50.0 g helium. 12.49 moles of helium are in the tank.
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which of the following aqueous solutions has the lowest freezing point and the highest boiling point? which of the following aqueous solutions has the lowest freezing point and the highest boiling point? 0.05 m na3po4 0.050 m nacl 0.100 m sucrose 0.050 m cacl2
The aqueous solution with the lowest freezing point and highest boiling point is 0.100 M sucrose.
Freezing point depression and boiling point elevation are directly proportional to the molality (moles of solute per kilogram of solvent) of a solution. Since 0.100 M sucrose has the highest concentration of solute, it will also have the greatest effect on both freezing point depression and boiling point elevation. NaCl, CaCl2, and Na3PO4 have similar molalities, so they will have similar effects on freezing point depression and boiling point elevation.A colligative property is a physical characteristic that depends on the quantity of solute supplied rather than the type of solute; for example, the freezing point will be lowered by the same amount of degrees Celsius whether we add 1000 sugar or salt particles to water.
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what mass (in g) of potassium chlorate is required to supply the proper amount of oxygen needed to burn 131.8 g of methane? assume 100% yield for both reactions. enter to 0 decimal places. are the equations balanced?
The balanced chemical equation for the complete combustion of methane is: CH4 + 2O2 -> CO2 + 2H2O. the mass of potassium chlorate needed to burn 131.8 g of methane is 999.47 g.
The number of moles of methane can be calculated as follows:
131.8 g methane / 16.04 g/mol = 8.22 moles
From the balanced chemical equation, we can see that 2 moles of oxygen are required to burn 1 mole of methane, so the number of moles of oxygen needed to burn 8.22 moles of methane is 2 * 8.22 moles = 16.44 moles.
The balanced chemical equation for the decomposition of potassium chlorate to produce oxygen is: 2KClO3 -> 2KCl + 3O2
So, for every 2 moles of potassium chlorate decomposed, 3 moles of oxygen are produced. Hence, to produce 16.44 moles of oxygen, we need 16.44 moles / 3 moles/2 moles of KClO3 = 8.22 moles of KClO3.
The mass of potassium chlorate required can be calculated as follows:
8.22 moles * 122.55 g/mol = 999.47 g
So, the mass of potassium chlorate required to supply the proper amount of oxygen needed to burn 131.8 g of methane is 999.47 g.
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which scenario represents the experimental portion of the scientific method? please choose the correct answer from the following choices, and then select the submit answer button. answer choices a student is in the lab working with a chemical compound and he notices that it is a powder and smells like rotten eggs. using the results of many tests, a scientist proposes a mechanism of action for a new anti-cancer drug. a chemist analyzes a substance and compares the results to those of several known compounds that were analyzed the same way. a scientist provides a tentative explanation for a reaction she has observed.
Scenario A represents the experimental portion of the scientific method.
In scientific research, the experimental portion of the scientific method involves collecting data through observation and experimentation. In scenario A, the student is observing and testing a chemical compound in the lab. By noticing its physical properties, such as its appearance as a powder and smell like rotten eggs, the student is gathering data. This information will then be used to make conclusions and develop hypotheses. In this scenario, the student is gathering data and making observations that will ultimately be used to test and support or refute scientific theories. The experimental portion of the scientific method is a crucial step in the scientific process and helps to increase understanding and generate new knowledge.
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Chemistry help please and thank you so much
In a chemical equation, reactants are substances before the reaction, subscripts are numbers added in front of chemical formula, chemical formula is representation of elements in compound,products are substances present after chemical reaction, coefficients are numbers showing the amount of individual atoms.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
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in which one of the following pairs will the first system have a higher entropy than the second? assume p and t are the same for each pair, unless stated otherwise. group of answer choices 1 mole he(g); 1 mole kr(g) 1 mole xe(g) at 1 atmosphere; 1 mole xe(g) at 0.5 atmosphere 1 mole ch4(g); 1 mole c2h6(g) 1 mole o2(g); 2 mole o(g) 2 mole o(g); 1 mole o2(g) flag question: question 2
20 one-dollar dollars were randomly distributed among 20 people, or 20 one-dollar bills were randomly divided among 10 entropy .
Which reaction has a higher entropy?Compared to solids or liquids, gases possess higher entropies because of their chaotic mobility.This implies that entropy will alter during a process in which the quantity of gas molecules present changes.
How can you tell if entropy is rising or falling?Entropy increases as a substance transitions from a solid to a liquid to a gas, and by observing the phases of a reactants and products, you can determine if an entropy change was positive or negative.Entropy rises whenever the number of gas moles rises.
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Name example where someone would create a model as part of a scientific investigation, and explain why they would need to use this model instead of working with the actual thing.
Scientific models are used to easily understand and interpret complex processes and natural phenomenon. For example, there are models for explaining water cycles, volcanic eruptions etc.
What are scientific models ?Scientific models are visual representations or simplified mathematical expressions used to interpret and understand complex process. There are theoretical models, dynamic models, still models as well advanced computer simulation models.
For example, the liquid drop model was used to explain the nuclear fission. Similarly, there are different atomic models to explain the structure of atoms. These are theoretical models.
There are advanced computer simulations nowadays to visualize many natural phenomenon's, like, volcanic eruptions, tectonic movements etc. Similarly still or working models of human organs etc. are examples of scientific models.
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you titrate a 200 ml hbr solution with 0.5 m koh. if it takes 150 ml of koh to reach the equivalence point, what was the concentration of the original acid solution?
the HBr solution has a concentration of 0.375 M.
What is the purpose of KOH solution?Lye, commonly known as potassium hydroxide, is an inorganic substance having the composition KOH.
Is KOH a basic or an acid?KOH is a reliable base. It often has a pH between 10 and 13.
The unidentified HBr solution has a concentration of 0.375 M.
Where M1 = Molar mass of HBr = and M2 = V1 x2 x2
V1 = Molar mass for KOH = 0.5 M2 = Volumes of Hyder = 200 ml x1 = n-factor for HBr = 1
V2 = Amount pf KOH Equals 150 ml x 2 = KOH's n-factor = 1
The numbers are now M1 200 1 = 0.5 150 1 M1 = 0.5 150 1 / 200 1 M1 =0.375 M.
Therefore, the HBr solution has a concentration of 0.375 M.
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A 300 kg car is moving with an acceleration of 10 m/s/s. What is the force of this car?
The force of the 300kg car moving with an acceleration of 10m/s² is 3000N.
How to calculate force?Force in physics refers to a physical quantity that denotes ability to push, pull, twist or accelerate a body.
The force of a body can be estimated by multiplying the mass of the body by its acceleration as follows:
Force = mass × acceleration
In this question, a 300kg car is said to be moving at an acceleration of 10m/s². The force is estimated as follows:
Force = 300kg × 10m/s²
Force = 3000N
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a solution of cacl2 in water forms a mixture that is 37.0% calcium chloride by mass. if the total mass of the mixture is 449.8 g, what masses of cacl2 and water were used?
The mass of calcium chloride and water used are 166.426 g and 283.374 g respectively.
A solution containing two or more different components is termed as a solution mixture.
The percentage of calcium chloride in the mixture is 37.0% by mass.
This means that in each 100g of the mixture, the mass of calcium chloride = 37.0 g
if the total mass of the mixture = 449.8g
the mass of calcium chloride and water used is calculated as:
mass of calcium chloride
= 37/100 × 449.8g
=166.426 g
And, the mass of water
=( 449.8- 166.426)g
= 283.374 g
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what is the ratio of conjugate base to acid for a weak acid at a ph of 5.0? the pka of the acid is 6.0.
The ratio of the conjugate base to the weak acid is 10:1 at a pH of 5.0.The pH of a solution is defined as the negative logarithm of the hydrogen ion (H+) concentration, so pH = -log[H+].
In a weak acid solution, the hydrogen ion concentration is proportional to the degree of dissociation of the weak acid, which can be expressed as follows:
HA + H2O -> H3O+ + A-
where HA is the weak acid, A- is the conjugate base, H3O+ is the hydronium ion, and the arrow indicates the direction of the equilibrium.
The degree of dissociation of a weak acid can be expressed in terms of the acid dissociation constant (Ka), which is given by:
Ka = [H3O+][A-] / [HA]
At the equivalence point of a weak acid, the pH is equal to the pKa of the acid, which is defined as the negative logarithm of the Ka value. In this case, the pKa of the acid is 6.0, so at a pH of 5.0, which is less than the pKa, the weak acid is only partially dissociated.
To calculate the ratio of the conjugate base to the weak acid, we can use the following expression:
[A-] / [HA] = [H3O+] / Ka
Since the pH = -log[H+], we can substitute [H+] for [H3O+] in the above expression.
At a pH of 5.0, [H+] = 10^-5, so:
[A-] / [HA] = 10^-5 / Ka
The value of Ka can be calculated using the pKa:
Ka = 10^(-pKa) = 10^(-6.0) = 1.0 x 10^-6
So, the ratio of conjugate base to acid at a pH of 5.0 is:
[A-] / [HA] = 10^-5 / 1.0 x 10^-6 = 10
So, the ratio of the conjugate base to the weak acid is 10:1 at a pH of 5.0.
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which bond is a weak bond that arises usually between a hydrogen and either an oxygen or nitrogen atom?
Solution: The bond between a hydrogen and nitrogen atom is weak bond as compared to the bond between hydrogen and oxygen atom is because of more electronegative nature of oxygen.
Bond strength depends upon the atomic size, electronegativity and bond length. The size of Oxygen atom is larger as compared to Nitrogen because of the stable electronic configuration of nitrogen. The electronegativity of oxygen is higher as compared to Nitrogen due to which the bond between Hydrogen and Oxygen is more polar than bond between Hydrogen and Nitrogen. Higher the bond polarity stronger the bond. This is the reason why the bond between Hydrogen and Nitrogen is weak bond as compared to the bond between Hydrogen and Oxygen.
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Calculate the percent composition of the elements in each compound. mgso4 c6h12o6
Composition within C6H12O6 compound is 40%, compared to 53.33% in MgSO4 compound.
Compound? What do you mean?A compound is anything created when two or more separate chemical reactions are mixed together in a specific proportion. Chemical connections that are challenging to break are created when the constituents interact with one another. These bonds occur as a byproduct of atoms sharing or trading electrons.
In MgSO4,
MgSO₄ = 120 g/mole.
Mass of Mg = 24 g.
Mass of S = 32 g.
Mass of O = 16.
Mass of O₄ = 16 × 4
= 64 g.
= 24/120 × 100 %
% comp. = 20 %
= 32/120 × 100%
= 0.266 × 100%
% comp. of S = 26.66 %
comp. of O₄ = Mass of O₄/Mass of MgSO₄ × 100 %
= 64/120 × 100 %
= 0.533 × 100 %
∴ % comp. of O₄ = 53.33 %
In C6H12O6,
Molar mass of compound = 6(12.0)+12(1.01)+6(16.0)
=180g/mol
Mass due to carbon =6(12.0)
=72.06g/mol
% composition of C =72/180×100
=40%
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An organic compound contains 75% carbon and 25% hydrogen. The empirical formula of the compound would be:
A. CH4
B. CH
C. C2H3
D. CH2
The given sentence indicates that the compound's empirical formula is CH2.
What is the name of a ch2 group?Any portion of a molecule and consists of 2 hydrogen atoms bonded to a carbon, which is related to the rest of the protein by two bonds, is known as a methylene group in organic chemistry. The group can be written as CH 2, with the two bonds denoted by the ".
ch2 and h2c can we write?why we occasionally write ch2 and occasionally h2c. CH2 and H2C are identical to one another. Although they both relate to the same entity, CH is sometimes written as H in molecular structures.
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Hello can someone please help me
1) Multiply the model’s weight by 123 to see what the real house would weigh.
The model weighs _____ lbs.
The real house would weigh ____________ lbs.
2) A regular balloon can lift 0.036 lbs. How many balloons would it take to lift the model house and the real house? Divide your answers from question 1 by 0.036 to find out.
The model would need _____________ balloons.
The real house would need _________________ balloons.
3) A regular balloon holds 0.52 cubic feet of helium. How many cubic feet of helium (the volume) would we need to lift the model and the real house? Multiply your answers from question 2 by 0.52 to find out.
The model: _________ cu. ft.
The real house: ______________ cu. ft.
4) Imagine instead of lots of little balloons, we used one big one! The radius of a sphere can be found using the following formula: R=3√((.75V)/(π)). Double check you’re using cube root. What is the radii (and diameters) of the giant balloons for the model and the real house?
On a TI 83, cube root is #4 under the “Math” menu. Then type in the rest using the cu. ft. as volume.
On a phone, type the cu. ft. x .75=... ÷ 3.14 =... then turn the calculator sideways and hit “3√x”
On a windows computer, use the phone steps, but press “view scientific” to find the “3√x” button.
The radius of the balloon for the model: _________ feet.
The diameter of the balloon for the model: _________ feet.
Radius of the balloon for the real house: _________ feet.
The diameter of the balloon for the real house: _________ feet.
5) An extra large helium tank can fill 600 balloons. How many tanks would I and Carl Fredricksen from “Up!” need? Divide your answers from question 2 by 600 to find out.
I would need _______ tanks.
Carl Fredricksen from “Up!” would need __________ tanks.
6) I can rent an extra large tank for $250. How much would it cost to buy the helium to lift the model and the real house? Multiply your answers from question 5 by 250 to find out.
Helium to lift the model costs $____________.
Helium to lift the real house costs $________________.
7) Empty balloons cost money, too. A balloon bought in bulk costs $0.125. How much do the empty balloons cost to lift the model and the real house? Multiply you answers from question 2 by 0.125 to find out.
The empty balloons for model would cost $_____________
The empty balloons for the real house would cost $____________________
The evaluation of the model and the real house using unit rate indicates that we get;
The model weighs 3,333 lbs. The real house weighs 409,959 ibsThe model would need 85,462 balloons. The real house would need 11,387,750 balloonsThe model: 44440.24 cu.ft. The real house 5,921,630 cu. ft.The radius of the balloon model: 21.97 feet. Diameter of the balloon for the model: 43.85 feet. The radius of the balloon for the real house: 112.23 feet. The diameter of the balloon for the real house: 224.46 feetI would need 143 tanks. The number of tanks needed for the real house is: 18980 tanksHelium to lift the model costs: $35,750. Helium to lift the real house costs: $4,745,000The empty balloons for the model would cost $10,682.75. The empty balloon for the real house would cost. $1,423,468.75What is a unit rate?A unit rate is the rate at which one item of a product or service is valued.
1) The model's weight that will be used to calculate the weight of the real house is required
Whereby the model weight is 3,333 lbs, we get
Model weight = 3,333 lbs
The number of models that are equivalent to the real house = 123 model units
Weight of the real house = 123 × 3,333 lbs = 409,959 lbs
2) The weight a regular balloon can lift = 0.036 lbs
The number of balloons that would lift the model is therefore;
3,333 lbs ÷ 0.036 lbs/balloon ≈ 85,462 balloons
The number of balloons that would lift the house is therefore;
409,959 lbs ÷ 0.036 lbs/balloon = 11,387,750 balloons
3) The volume of helium in one balloon = 0.52 cubic feet
The volume of helium that would be needed to lift the model is therefore;
85,462 balloons × 0.52 cu. ft./balloon = 44440.24 cu. ft.
The volume of helium that would be needed to lift the real house can be found as follows;
11,387,750 balloons × 0.52 cu. ft./balloon = 5921630 cu. ft.
4) The formula for the radius of the sphere is; R = ∛(0.75·V/π), where;
V = The volume of the balloon or the gas it contains
Therefore, for the model, we get;
V = 44440.24 cu. ft., therefore;
R = ∛(0.75 × 44440.24/π) ≈ 21.97 feet
The radius for the balloon for the model: 21.97 feet
The diameter = 2 × 21.97 ≈ 43.95
The diameter for the balloon for the model is about 43.95 feet
The values for the balloon for the real house are;
R = ∛(0.75 × 5921630/π) ≈ 112.23
The radius of the balloon for the real house: 112.23 feet
Diameter ≈ 2 × 112.23 = 224.46
The diameter for the balloon for the real house is about 224.46 feet
5) The number of balloons that an helium tank can fill = 600 balloons
The number of tanks of helium needed to fill the balloons that will lift the model are therefore;
85,462 balloons/(600 balloons/tank) ≈ 143 tanks
(The above value is obtained by rounding up)
The tanks needed to lift the model = 143 tanks of helium
The number of tanks needed for the real house is found as follows;
11,387,750 balloons/(600 balloons/tank) ≈ 18979.53 tanks
6) The cost of the renting the extra large tank of helium to lift the model and the real house can be found as follows;
The unit rate for the cost of renting one tank = $250
The cost of helium to lift the model is therefore;
143 tanks × $250/tank = $35,750
The cost to lift the real house can be found as follows;
18979.53 tanks ≈ 18980 tanks
Cost ≈ 18980 tanks × $250/tank = $4,745,000
The cost to lift the real house is about $4,745,000
7) The cost per balloon = $0.125
Cost of the empty balloons to lift the model is therefore;
Cost of balloons ≈ $0.125/balloon × 85,462 balloons = $10,682.75
The cost of balloons to lift the model is about $10,682.75
Cost of the empty balloons to lift the real house is therefore;
Cost ≈ $0.125/balloon × 11,387,750 balloons ≈ $1,423,468.75
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which salt would lower the freezing point of a solvent the most? group of answer choices 0.20m na3po4 0.50m cacl2 0.30m na2so4 0.7m nacl
Considering the number of the particles and the molality 0.20m Na3PO4 would lower the melting point the most.
What are colligative properties?Colligative properties are the physical properties of solutions that depend on the number of solute particles in a given amount of solvent, but not on their chemical nature. Examples of colligative properties include boiling point elevation, freezing point depression, osmotic pressure, and vapor pressure lowering.
Since 0.20m Na3PO4 has the most number of particles then it would lower the melting point the most.
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a responder can protect himself/herself from radiation by using shielding as a response action. what materials are best for protecting against beta particles? select one: a. heavy elements (e.g., lead and steel) b. any material (e.g., paper and plastic) c. lighter elements (e.g., acrylic, plastic, and aluminum) d. hydrogenous material (i.e., high in hydrogen content)
A responder can protect himself/herself from radiation by using shielding as a response action. Lighter elements (e.g., acrylic, plastic, and aluminum) are best for protecting against beta particles. Therefore, option c is the right choice.
Aluminum with a thickness of just a few millimeters provides the best protection against beta particles. However, low-atomic-mass materials such as plastic, wood, water, and acrylic glass are suitable for shielding high-energy beta-particle radiation.
The use of these materials in personal protective equipment, which includes all of the clothes that can be worn to avoid any injury or disease that may be caused by exposure to radiation, is another possible application of these materials.
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The formula for Boyle’s Law is P subscript 1 V subscript 1 equals P subscript 2 V subscript 2 where P subscript 1 is the initial pressure, V subscript 1 is the initial volume, P subscript 2 is the final pressure, and V subscript 2 is the final volume. To solve these problems: (1) identify all that is known; (2) identify what is unknown; (3) write the equation; (4) isolate the unknown; and, (5) calculate the answer.
Boyles's law is one of the gas laws that describe the relationship between the pressure and volume of a given mass of gas at a constant temperature.
What is Boyle's law?According to Boyle's law, a gas's pressure is inversely proportional to its volume when the gas is of a certain mass and maintained at a constant temperature. In other words, as long as the temperature and volume of the gas remain constant, the relationship between a gas's pressure and volume is inverse.
The equation of Boyle's law is given below:
P₁V₁ = P₂V₂
where;
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What is the maximum number of bonds phosphorous can form?
Five covalent bonds are possible with phosphorus, as in PCl₅.
Two chlorides are produced by phosphorus: PCl₃ and PCl₅. Depending on the amount of chlorine present, both products are created when phosphorus burns in chlorine. The diagram of PCl₃ and PCl₅ is attached
Not a noble gas structure, as the phosphorus now possesses 5 pairs of electrons in the outer level. Phosphorus is a chemical element with the symbol P and atomic number 15.
Phosphorus is a mineral that naturally occurs in many foods and is also available as a supplement.
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You mix 2 moles of HBr with 3 moles of KOH in enough water to make 1 L of solution. How much KBr do you expect to make?a. 2 molesb. 5 molesc. 3 molesd. 1 moles
c. 3 moles. The three moles of KBr we can expect when You mix 2 moles of HBr with 3 moles of KOH in enough water to make 1 L of solution.
How can you tell whether a solution is simple?The pH of a solution will range from 0 to 14. Solutions having a pH of 7 are referred to as neutral. If the pH is lower than 7, the solution is acidic. When the pH level is higher than 7, the solution is basic.
What is the pH of the buffer solution?When a weak base and its salt are combined with a strong acid, basic buffer—which has a basic pH—is created. The pH of an equal mixture of ammonium hydroxide and ammonium chloride in water is 9.25. They contain the weak base and the weak base salt.
Does lactate serve as a buffer for pH?During prolonged, high-intensity exercise, lactate acts as a temporary "neutralizer" or "buffer" to the cell's increased proton accumulation. Since increased lactate synthesis and acidity go hand in hand, lactate testing is a great "indirect" indicator of the cell's metabolic state.
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when 18.02 g of water is decomposed by electrolysis, 16.00 g of oxygen and 2.02 g of hydrogen are formed. according to the law of definite proportions, what masses, in grams, of (a) hydrogen and (b) oxygen
According to the law of definite proportions, the ratio of the masses of elements present in a chemical compound is always constant and does not vary with the amount of the compound.
Given that 18.02 g of water is decomposed by electrolysis to form 16.00 g of oxygen and 2.02 g of hydrogen, we can calculate the ratio of the masses of oxygen and hydrogen in water.
(a) The mass of hydrogen in water can be expressed as 2.02 g.
(b) The mass of oxygen in water can be expressed as 16.00 g.
Therefore, the masses, in grams, of (a) hydrogen and (b) oxygen in water are 2.02 g and 16.00 g, respectively.
In the case of water, the law of definite proportions states that the ratio of the masses of hydrogen and oxygen in water is always 1:8. This means that, for every 1 gram of hydrogen, there are 8 grams of oxygen in water. This ratio can be determined through experiments such as electrolysis, as described in the previous answer.
The law of definite proportions has important implications for our understanding of chemical compounds and their behavior. It helps us to identify and characterize different compounds and to predict their properties based on the elements they contain. It also forms the basis for the development of the atomic theory and the periodic table of elements.
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which of the following is an accurate description of ionic bonding? group of answer choices atoms of two different elements share electrons and protons; the resulting compound is bonded together by the strong, binding energy of shared protons. atoms of different elements, having gained or lost electrons, form negative and positive ions that are bonded together by attractive forces between ions with opposite charges. nuclei of bonding atoms exchange electrons; the resulting ions are bonded together by the attractive forces between the negative and positive nucleons. nuclei of two different atoms share electrons, and the resulting compound is tightly bonded by the very strong, induced, electronuclear bonds.
An accurate description of ionic bonding is atoms of different elements, having gained or lost electrons, form negative and positive ions that are bonded together by attractive forces between ions with opposite charges (B).
The answer choices should have as follow :
A. atoms of two different elements share electrons and protons; the resulting compound is bonded together by the strong, binding energy of shared protons.
B. atoms of different elements, having gained or lost electrons, form negative and positive ions that are bonded together by attractive forces between ions with opposite charges.
C. nuclei of bonding atoms exchange electrons; the resulting ions are bonded together by the attractive forces between the negative and positive nucleons.
D. nuclei of two different atoms share electrons, and the resulting compound is tightly bonded by the very strong, induced, electronuclear bonds.
Ionic bondingThe ionic bonding is formed from electrostatic attraction between the two ions which oppositely charged. In specific, there is a transfer of some electrons (outermost) from one atom to another. If the atom loses the electrons, it results in a positively charged ion or cation. Meanwhile, if the atom gaining one or more electron, it becomes an anion or a negatively charged ions.
Sodium chloride (NaCl) is an example of ionic bonding. An atom of sodium (Na) donates one of its electrons to an atom chlorine (Cl) and resulting positive ion (Na+) and negative ion (Cl-) become a stable compound.
Thus, the correct option is B, because only electrons that are shared.
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