In a chemical process, hydrogen metals cannot take the place of iron (Fe). Hence option 'c' is correct.
Describe a metal.Metals are bright, opaque materials that easily conduct electricity and heat. Most metals are malleable and ductile, and they frequently have a higher density than other elements.
What distinguishes metals from nonmetals and metalloids?In general, metals are elements that are hard, lustrous, fusible, malleable, ductile, and have good electrical & thermal conductivity. An element without the characteristics of a metal is referred to as a nonmetal. The metalloid is a element with characteristics that are halfway between those of metals and nonmetals.
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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 )
calculate the vapor pressure of water above this solution at 338 k . the vapor pressure of pure water at this temperature is 0.2467 atm .
The vapor pressure of a non-volatile solute at 338 K
is 0.176 atm.
Calculate The value of the elevation in boiling point :
∆Tb= 384.6 K – 373.15 K = 11.45 K
Then calculate molality :
molality =∆ТЬ /Kb =11.45/ 0.51 = 22.45 m
A solution of 22.45 molal thus includes 22.45 moles of the solute in 1000 g of the solvent (water). The following step is to determine how many moles of water are present using the molar mass of water and the previously mentioned figure of 1000 g water:
Moles= 1000g /18g/mol=
The mole fraction of water solution :
mole of H20 solution= 55.6 : (55.6+22.45) =0.71
Then calculate The vapor pressure of a non-volatile solute at 338 K :
vapor pressure (at 384.6K) =0.2467 atm
vapor pressure (at 338K) = vapor pressure of pure water (at 384.6K) x Mole fraction of water
vapor pressure (at 338K) 0.2467 atm x 0.7123 = 0.176 atm
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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
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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how many kilojoules of heat are released when 38.7 g of ch4(g) reacts completely with o2(g) to form ch3oh(g) at constant pressure?
The reaction between 38.7 g of CH4(g) and O2(g) to form CH3OH(g) releases 890 kJ of heat at constant pressure.
Calculation of Heat of Reaction for CH4 and O2 CombinationWhen 38.7 g of CH4(g) reacts completely with O2(g) to form CH3OH(g), the reaction releases a certain amount of heat. This amount of heat can be calculated by using the balanced chemical equation for the reaction and the heat of the reaction (ΔH). The balanced equation for the reaction is CH4(g) + 2O2(g) -> CH3OH(g) + heat. The heat of reaction, which represents the amount of heat released or absorbed in a chemical reaction, can be found in a thermochemistry table or calculated using other thermochemical relationships. In this case, the heat of the reaction is 890 kJ. This means that when 38.7 g of CH4(g) reacts completely with O2(g) to form CH3OH(g), 890 kJ of heat is released at constant pressure.
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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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what is the total pressure exerted by a mixture containing two gases if the partial pressure of one gas is 70 torr and the partial pressure of the other gas is 30 torr?
The mixture exerts a 100 torr total pressure.
What is pressure?The force applied to a surface in relation to its area is measured as pressure. The force applied to a unit of area is measured in units of force per unit of area, such as Newtons per square metre (N/m2) or pounds per square inch (psi).
A gas mixture's total pressure is equal to the sum of the partial pressures of its constituent gases. The pressure that a gas would have if it were the only one in the container is known as the partial pressure of a gas.
How do you determine it?The sum of the partial pressures of the two gases= 70 torr + 30 torr = 100 torr ,gives the total pressure of the combination of two gases.
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n iodometric titration is performed on a 5.00 ml aliquot from a 100.0 ml volumetric flask containing a solution of vitamin c. the titrant volume is 5.50 ml when the solution turns a dark blue color. how many milligrams of vitamin c is contained in the aliquo
The milligrams of vitamin c is contained in the aliquot is 74.45mg
The following equation may be used to determine the amount of vitamin C in the aliquot:
Concentration (mg/L) is calculated as follows:
[tex]\frac{(Titrant Volume (mL) x Normality x Vitamin C Molecular Weight (mg/mol)) }{Aliquot Volume (mL)}[/tex]
As a result, the amount of vitamin C in the aliquot is as follows:
[tex]\frac{5.00 mL }{ (5.50 mL x 0.1 x 176.12 mg/mol) }\\\\= 14.89 mg/L[/tex]
The aliquot's vitamin C content is therefore:
[tex]14.89 mg/L x 5.00 mL\\ \\= 74.45 mg[/tex]
74.45mg of vitamin c is contained in the aliquot
A precise part of a sample or the whole amount of a liquid, as used in chemistry or other sciences (e.g. exactly 25 mL of water taken from 250 ml)
In pharmaceutics, an aliquot is a proportionate dilution of known inactive compounds that is used to measure chemicals below the sensitivity of a scale.
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complete question:An iodometric titration is performed on a 5.00 ml aliquot from a 100.0 ml volumetric flask containing a solution of vitamin c. the titrant volume is 5.50 ml when the solution turns a dark blue color. how many milligrams of vitamin c is contained in the aliquot
what is the correct lewis structure for the molecule in the box, including the formal charge(s), if any? hno3
The best way to conceptualize the HNO3 Lewis structure is as the NO3 with a H linked to one of the oxygen atoms.
This pattern is typical of several acids. Calculate the total number of valence electrons in the HNO3 molecule using its Lewis structure.
The valence shell electrons in a molecule are depicted in an extremely simplified manner by a Lewis Structure. It is used to demonstrate how the electrons in a molecule are positioned around particular atoms. When two atoms are bonded together, electrons are depicted as "dots" or as a line.
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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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gases behave most ideally at choose... temperatures and choose... pressures.
Gases are most ideal at high temperature and low pressure. We can infer that intermolecular forces are to blame for the real gas's lower pressure than the ideal gas's pressure.
At a specific temperature and pressure, which gases are predicted to perform most optimally?Helium is the actual gas that behaves the most like an ideal gas. This is due to the fact that helium, unlike the majority of gases, only consists of a single atom, which minimizes the van der Waals dispersion forces.
Which gas exhibits the ideal behavior?Helium
The real gas that acts most like an ideal gas is helium. This is because helium has the lowest possible van der Waals dispersion forces because, unlike most gases, it only contains one atom. Another feature is that, like other noble gases, helium has an entirely full outer electron shell.
What is an ideal gas?An ideal gas is one whose molecular volume and molecular force ratios are both so minimal that they have no impact on the behavior of the gas.
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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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the density of solid fe fe is 7.87 g/cm3. 7.87 g / cm 3 . how many atoms are present per cubic centimeter (cm3) ( cm 3 ) of fe?
The correct answer is
The 8.48 X 10^-24 atoms/cm^3 of Fe particles are present.
A solid will have a certain density at ambient temperature and atmospheric pressure. The material's mass per unit volume is used to determine density. You may calculate it by dividing the object's total mass, M, by its total volume, V: =M/V. Simply said, solid masses have a high density due to the close proximity of their particles, liquid masses have a little lower density, and gas masses have a very low density due to the distance between their particles.
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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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which of the components of the atomic symbol format xza can be used alone to determine the identity of an element? select all that apply
The atomic symbol format "xza" consists of three components:
X: The element's chemical symbol, which is typically a one- or two-letter abbreviation of the element's name.
Z: The atomic number of the element, which is the number of protons in its nucleus.
A: The atomic mass of the element, which is the total number of protons and neutrons in its nucleus.
Of these three components, only the atomic number (Z) can be used alone to determine the identity of an element, as it uniquely defines the element and its place in the periodic table. The chemical symbol (X) can also be used to identify an element, but only in conjunction with a periodic table, as some elements have similar symbols. The atomic mass (A) provides information about the mass of the element's nucleus, but does not allow for a unique determination of the element's identity.
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Complete question:
Which of the components of the atomic symbol format xza can be used alone to determine the identity of an element? select all that apply
A. The letter "x"
B. The letter "z"
C. The letter "a"
D. None of the above
which of the interactions makes the largest contribution to the stability of a folded protein?
About equal amounts are contributed by each encounter. The hydrophobic effect, or the of unsaturated R groups inside the protein core and away from the solvent water, is a crucial factor in protein stability.
Explain what water is.Water is a material that exists in gaseous, liquid, and solid phases and is made up of the essential elements hydrogen and oxygen. One of the prevalent and necessary substances is it. It is a colorless, odorless liquid at room temperatures with the crucial property of dissolving several other compounds.
What makes water wet?Due to its low viscosity, which is caused by the relatively weak connections between its molecules, water is moist in the sense that it flows readily.
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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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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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at a constant temperature and pressure, there are initially 0.200 moles of a gas at a volume of 300.0 ml. the volume changes to 650.0 ml. calculate the moles of gas in this new volume.
To find the number of moles of gas in the new volume of 650.0 ml, we need to use the Ideal Gas Law equation. Therefore, the number of moles in the new volume of 650.0 ml is 0.200 moles.
Ideal Gas Law and Moles of GasThe Ideal Gas Law states that the pressure, volume, and temperature of a gas are directly proportional to the number of moles of gas present, as long as the temperature is kept constant. Mathematically, this can be represented as PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin. Since the temperature and pressure are constant in this problem, we can use the Ideal Gas Law to calculate the number of moles of gas present in the new volume.
By substituting the known values into the equation, we can solve for the new number of moles:
PV = nRT
(P)(650.0 ml) = (0.200 moles)(R)(T)
Dividing both sides by RT gives:
V = (n/P)RT
V = (0.200 moles/P)RT
V = (0.200 moles/P)(650.0 ml)
Hence, the number of moles in the new volume of 650.0 ml is 0.200 moles.
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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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A steel plaque is attached to a block of wood. The steel and the wood have the same mass. After the steel plaque and the wooden block were left outside in the sun for a period of time, both the steel and the wood had increased in temperature, but the steel had a higher temperature than the wood.It’s possible that the steel plaque had a higher temperature than the wooden block because it________ its surroundings.
If the steel and the wood received the same amount of energy from the Sun, then the specific heat capacity of the steel must be_______ the specific heat capacity of the wood.
Answer:
Explanation:
A steel plaque is attached to a block of wood. The steel and the wood have the same mass. After the steel plaque and the wooden block were left outside in the sun for a period of time, both the steel and the wood had increased in temperature, but the steel had a higher temperature than the wood.It’s possible that the steel plaque had a higher temperature than the wooden block because it__absorbed more heat from______ its surroundings.
If the steel and the wood received the same amount of energy from the Sun, then the specific heat capacity of the steel must be_less than
______ the specific heat capacity of the wood.
The steel plaque had a higher temperature than the wooden block because it has a lower specific heat capacity than wood.
What is specific heat capacity?Specific heat capacity is the amount of energy required to raise the temperature of one unit of mass of a substance by one degree Celsius. Substances with a lower specific heat capacity require less energy to raise their temperature than substances with a higher specific heat capacity.
Therefore, even if both the steel plaque and the wooden block received the same amount of energy from the sun, the steel plaque would still have a higher temperature because it required less energy to raise its temperature than the wood did.
In summary, the steel plaque had a higher temperature than the wooden block because it absorbed heat more efficiently from its surroundings, and the specific heat capacity of steel is lower than the specific heat capacity of wood.
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submitting work based on data that you did not collect yourself
The use of another person's information without properly citing and recognizing it within your own work is known as plagiarism.
What exactly does data mean?In technology, the term "data" refers to information that has been formatted in a way that makes it effective for transmission / processing. Data is information that has been binary-digitally changed for usage with modern computers and transmission technologies. The topic data may be expressed in both the plural and singular forms.
What functions do data serve?Information that has been transformed it into format that can be transmitted or processing is referred to as data in computing. Data is information that has been binary-digitally changed for usage with modern computers and transmission technologies.
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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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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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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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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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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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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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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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If we triple the temperature and double the volume, what would the new pressure of the system be? a. 20 atmb. 15 atmc. 7.5 atmd. 10 atm
The correct option is A. If we triple the temperature and double the volume, what would the new pressure of the system be 20 atm.
Stress is pressure according to the unit region of the surface; the SI unit for strain is the pascal (Pa), described as 1 newton consistent with a square meter (N/m2). The pressure exerted by using an object is proportional to the force it exerts and inversely proportional to the vicinity on which the pressure is exerted.
The pressure applied is perpendicular to the floor of items per unit location. The simple system for pressure is F/A (force in step with the unit region). The unit of pressure is Pascals (Pa). whilst sipping liquids from a straw, have you ever noticed that you honestly suck the air out of the straw at the same time as you sip the beverage, you’re honestly making use of ‘stress’. the quantity of force exerted (thrust) on a surface in step with the unit region is defined as ‘strain’. it may additionally be described as the ratio of the force to the region (over which the pressure is acting).
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