Answer:
A
Explanation:
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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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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The Law of Conservation of Mass states that
a.
matter cannot be created or destroyed.
b.
matter is destroyed through fire.
c.
matter is converted into energy.
d.
matter cannot move at the speed of light.
Answer:
The answer is A I think sorry if I'm wrong
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 pile of firewood is more stable as ash and smoke than firewood.
Why does this pile of firewood not immediately release the energy in
Its chemical bonds? (use the word activation energy in your answer)
The pile of firewood does not immediately release the energy in its chemical bonds because activation energy is higher in case of solids where forces of attraction is maximum.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
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howmanyliters of a 25% saline solution must be added to 3 liters of a 10% saline solution to obtain a 15%saline solution
2 liters of a 25% saline solution must be added to 3 liters of a 10% saline solution to obtain a 15% saline solution.
To obtain a 15% saline solution, you must add 2 liters of a 25% saline solution to 3 liters of a 10% saline solution. This is calculated using the following equation:
(3 x 0.10) + (x x 0.25) = (x + 3) x 0.15Where x is the number of liters of the 25% saline solution. Solving for x, we get x = 2. Therefore, 2 liters of a 25% saline solution must be added to 3 liters of a 10% saline solution to obtain a 15% saline solution.
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If you were to complete a mass balance on a coffee roaster, which of these would NOT be a material stream exiting out of the roaster? a. Spent coffee grounds b. Chaff c. Roasted coffee beans d. Water vapor, carbon dioxide, and other VOCs
Out of the options listed, "Water vapor, carbon dioxide, and other volatile organic compounds (VOCs)" would not be considered a material stream exiting the roaster.
A material stream is a flow of a physical substance, such as a solid, liquid, or gas, that enters and exits a system or process. In the context of a chemical or process plant, a material stream is a stream of raw materials, intermediate products, or final products that are being produced, transported, or processed.
To perform a mass balance on a coffee roaster, you would consider all the material streams that enter and exit the system. These are gaseous emissions resulting from the roasting process and are not a physical material. The other options, "Spent coffee grounds," "Chaff," and "Roasted coffee beans" are physical materials that can be weighed and measured, and would be considered as material streams exiting the roaster.
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what is the maximum number of bonds phosphorous can form?
Phosphorus (P) having atomic number 15 can only make a maximum of five bonds.
Describe phosphorus.A mineral called phosphorus is found in many foods naturally and can also be taken as a supplement. It has a number of functions in the body. It is a crucial component of cell membranes, bones, and teeth. It maintains a normal range of blood pH and aids in the activation of enzymes.
What foods are phosphorus-rich?Many meals naturally contain phosphorus, but dairy, poultry, shellfish, legumes, and nuts are the largest sources. These foods contain what is referred to as organic phosphorus. Animal foods absorb it more effectively than plant foods do.
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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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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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Rank the following ions in order of increasing basicity. Be sure to answer all parts. CH3CH2 CH3NH CH3O intermediate basicity highest basicity lowest basicity ? Rank the following ions in order of increasing basicity. Be sure to answer all parts. SI CI lowest basicity intermediate basicity highest basicity
The basicity hierarchy is CH3CH2 CH3NH CH3O, where CH3O has the highest basicity, CH3NH has a middle basicity, and CH3CH2 has the lowest basicity.
What is base?In order to raise the concentration of hydroxide ions (OH-) in a solution, a chemical must be able to receive hydrogen ions (protons).
An ion's basicity is determined by its capacity to transfer electrons to an acidic species like a proton (H+), which is an acidic species. An atom's ability to transfer electrons decreases with increasing electronegativeness, which also lowers its basicity. Because CH3CH2 is a non-polar alkane without any functional groups that can transfer electrons, it has a low basicity. Because nitrogen is more electronegative than carbon and can take part in reactions that donate electrons, CH3NH is more basic than CH3CH2. Because oxygen is much more electronegative than nitrogen and can take part in more powerful electron-donating reactions, CH3O is the most basic of the three.
CI has a lower basicity than SI, whereas SI has a higher basicity. If an ion can receive a proton (H+) to form a bond, it is said to be basic. The lower the basicity and less probable an atom is to receive a proton, the more electronegative it is. CI is less basic than SI because carbon has a lower electronegative potential than silicon.
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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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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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Water is a liquid at room temperature. this is due to?
Solution: Water is liquid at room temperature because the molecules of water are bound by H bonding so the water molecules are not able to move freely and behave as a liquid.
Solid, liquid and gases differ in their densities, their arrangement of atoms/ molecules and their bonding or force of attraction between the atoms/ molecules. Water is liquid because molecules of water have medium intermolecular space between them and weak force of attraction which allow the molecules of water to move within the limit so it can only flow. Another reason for the liquid nature of water is presence of H bonding which hold the water molecules and don’t let them move freely. The energy needed to break the H bond is moderate and not available at room temperature. Hence water is liquid at room temperature.
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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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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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compound a has a boiling point of 200 oc, while compound b has a boiling point of 100 oc. which is more of a safety concern?
Compound B should raise more safety concerns than compound A because the vapour pressure of the bottle of the liquid with a low boiling point will be higher than that of the liquid with a high boiling point.
What causes a compound's vapour pressure to rise? Higher intermolecular forces?The average energy of the particles present increases as the temperature rises. That implies that a greater number of them are probably energetic enough to break off from the liquid's surface. The vapour pressure will likely rise as a result.
What causes a compound's vapour pressure to be higher?Types of Molecules: A solid's or liquid's vapour pressure is determined by the kinds of molecules that make up the substance. The vapour pressure will be relatively low if the intermolecular interactions between molecules are quite strong. The vapour pressure will be high since the substance is relatively weak.
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why is it important to make sure that water does not unintentionally get into the t-butyl alcohol solvent when determining the freezing temperature of t-butyl alcohol?
Tert-butyl alcohol (TBA), the solvent, has a practical melting point (23–26 °C)1 and a relatively high value for kf, 8.09 kg/C/mol.
Tert-butyl is a tertiary alcohol, right?The tertiary alcohol having the simplest formula, (CH3)3COH, is tert-butyl alcohol . Tertiary alcohol, formula, and 1-butanol are some of its isomers. Tert-butyl alcohol is still a colourless solid that melts at or just below room temperature with a smell similar to that of honey.
What is the purpose of TBA?
To be announced (TBA), to just be confirmed (TBC), to really be determined or decided upon (TBD), to be declared (TBD), or other variations are placeholder terms use it very broadly throughout event management to indicate that while something will be scheduled or expected to occur, a specific detail of that is still to be fixed or set.
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Jennifer performed an experiment to see how temperature affects the rate of breathing. Group A will have their rate of breathing measured in 350 F and Group B will have their rate of breathing measured in 700 F. (IM LOOKING FOR THE HYPOTHESIS STATEMENT)
Group A will have their rate of breathing measured in 350 F and Group B will have their rate of breathing measured in 700 F.Jennifer performed an experiment that if the temperature increases then the rate of breathing will also decrease.
What is the measurement for breathing rate?Your breathing rate is another name for your respiratory rate. This is how many breaths you take per minute. You can calculate your breathing rate by counting the number of breaths you take in one minute while at rest.
This is because the increase in body temperature will increase the heart rate making it harder to breathe.
Thus, the temperature increases then the rate of breathing will also decrease.
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Who were the first people to attempt to explain chemical changes?
Democritus and Aristotle, Greek philosophers who proposed early theories on the matter's nature and the changes it experiences, are credited with making the first attempt at explaining chemical processes.
In science, what exactly is a chemical change?A chemical change, often known as a chemical reaction, is the activity whereby an one or more materials are converted chemically into another. A drug combining with another substance may be necessary in this situation. It might also entail a substance disintegrating into other substances.
Does burning sheets cause a chemical change?Because ash is created throughout the burning process as an unique chemical substance, scorching paper results in a chemical change. Carbon reacts with nitrogen and oxygen during combustion to produce carbon dioxide (CO2) and water. substance.
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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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4Fe+ 3O2 > 2Fe2O3 To produce 3 moles of Fe2O3 how many moles of Fe must be reacted?
Answer: 6 mol Fe
Explanation: For every 2 mol of Fe2O3, 4 mol of Fe react. That means for every mol of Fe2O3, 2 mol of Fe react. 3 mol Fe2O3 require 6 mol Fe.
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 )
nacl [table salt] made up of na and cl ions dissolves in water but not in paint thinner. it is therefore a:
It is therefore an ionic compound, if NaCl is made up Na and Cl ions.
NaCl is an ionic solid. It dissociates into [tex]Na^{+}[/tex] and [tex]Cl^{-}[/tex] ions when it dissolves in water. By creating ion-dipole interactions, water molecules solvate these ions. The chemical equation for the dissociation of sodium chloride into [tex]Na^{+}[/tex] ions and [tex]Cl^{-}[/tex] ions when salt is dissolved in water is:
NaCl (s) → [tex]Na^{+} (aq) + Cl^{-} (aq)[/tex]
As a result, adding salt to water causes a chemical change. The products differ from the reactant (sodium chloride, or NaCl), which (sodium cation and chlorine anion). Therefore, a chemical change would occur in any ionic molecule that is soluble in water.
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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
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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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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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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