Combined Gas Law Online Quiz

2.

What type of relationship is shown between temperature and pressure?

Direct
Indirect (inverse)
Exponential
Logarithmic

Correct Answer

A. Direct

Explanation

The relationship between temperature and pressure is direct, meaning that as temperature increases, pressure also increases. This is because as temperature rises, the average kinetic energy of the gas molecules increases, leading to more frequent and forceful collisions with the container walls, resulting in an increase in pressure.

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3.

Which of the following terms is used to describe the average kinetic energy of the molecules in a sample?

Manometer
Temperature
Pressure
Volume

Correct Answer

A. Temperature

Explanation

Temperature is the correct answer because it is the term used to describe the average kinetic energy of the molecules in a sample. Temperature is a measure of the average speed and energy of the particles in a substance. It is directly related to the kinetic energy of the molecules, with higher temperatures corresponding to higher average kinetic energies.

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4.

Carbon dioxide occupies a 2.54 L container at STP. What will be the volume when the pressure is 150 KPa and 26 C?

1.89 L
42300 L
0.163 L
14.1 L

Correct Answer

A. 1.89 L

Explanation

At STP (Standard Temperature and Pressure), the volume of carbon dioxide in a 2.54 L container is given. To find the volume at a different pressure and temperature, we can use the ideal gas law equation, PV = nRT. Since the amount of gas (n) and the gas constant (R) are constant, we can rearrange the equation to solve for the new volume. By plugging in the given values for pressure, temperature, and the initial volume, we can calculate the new volume, which is 1.89 L.

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5.

If the pressure exerted on a gas is tripled, what will happen to the volume (assuming the temperature and amount of gas remains constant)?

X2
X3
X 1/2
X 1/3

Correct Answer

A. X 1/3

Explanation

When the pressure exerted on a gas is tripled, the volume of the gas will decrease by a factor of 1/3. This is because according to Boyle's Law, there is an inverse relationship between the pressure and volume of a gas when the temperature and amount of gas remain constant. As the pressure increases, the volume decreases proportionally. Therefore, if the pressure is tripled, the volume will decrease by a factor of 1/3.

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6.

Which of the following is not a standard pressure measurement?

101.3 kPa
1 atm
760 mm Hg
273 K

Correct Answer

A. 273 K

Explanation

The given options consist of different units used to measure pressure. 101.3 kPa, 1 atm, and 760 mm Hg are all standard pressure measurements commonly used in various fields. However, 273 K is not a standard pressure measurement. It is actually a standard temperature measurement in Kelvin. Pressure and temperature are two different physical properties, and therefore, 273 K cannot be considered a standard pressure measurement.

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7.

A balloon is inflated to a volume of 130 ml at a pressure of 690 mmHg. If the pressure is increased to 1000 mmHg, what will the new volume be?

188 ml
98.8 ml
89.7 ml
40300 ml

Correct Answer

A. 89.7 ml

Explanation

When the pressure of a gas increases, its volume decreases, assuming the temperature and amount of gas remain constant. This relationship is described by Boyle's Law. In this question, the initial volume of the balloon is 130 ml at a pressure of 690 mmHg. When the pressure is increased to 1000 mmHg, the new volume can be calculated using Boyle's Law equation: P1V1 = P2V2. Plugging in the values, we get (690 mmHg)(130 ml) = (1000 mmHg)(V2). Solving for V2, we find that the new volume is 89.7 ml.

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8.

The volume of a gas is increased from 150.0 mL to 350.0 mL by heating it. If the original temperature of the gas was 25.0 °C?

-146 C
10.7 C
426.85 C
150 C

Correct Answer

A. 426.85 C

Explanation

To solve this problem, we can use Charles's Law, which states that the volume of a gas is directly proportional to its temperature when pressure and the number of moles of gas are constant.
The equation for Charles's Law is:
V₁/T₁ = V₂/T₂
Where: V₁ = Initial volume T₁ = Initial temperature V₂ = Final volume T₂ = Final temperature
Given: V₁ = 150.0 mL T₁ = 25.0 °C = 25.0 + 273.15 K = 298.15 K (converting Celsius to Kelvin) V₂ = 350.0 mL
We need to find T₂.
Using Charles's Law:
150.0 mL / 298.15 K = 350.0 mL / T₂
Now, let's solve for T₂:
T₂ = (350.0 mL * 298.15 K) / 150.0 mL T₂ = 700.0 K
Now, we need to convert the temperature back to Celsius:
T₂ = 700.0 K - 273.15 T₂ ≈ 426.85 °C

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9.

How many mm Hg is equal to 121 kPa?

1.19
16.1
636
908

Correct Answer

A. 908

Explanation

121 kPa is equal to 908 mm Hg. This conversion is based on the fact that 1 kPa is equal to 7.5 mm Hg. Therefore, to convert kPa to mm Hg, you multiply the value in kPa by 7.5. In this case, 121 multiplied by 7.5 equals 908 mm Hg.

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10.

In which of the following sets of conditions would a gas most act as a real gas?

High temperature and low pressure
High temperature and high pressure
Low temperature and high pressure
Low temperature and low pressure

Correct Answer

A. Low temperature and high pressure

Explanation

At low temperature and high pressure, the gas particles are closer together and have less kinetic energy. This means that the intermolecular forces between the particles become more significant, causing the gas to deviate from ideal gas behavior and behave more like a real gas. In contrast, at high temperature and low pressure, the gas particles have greater kinetic energy and are more spread out, minimizing the effect of intermolecular forces and promoting ideal gas behavior.

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Combined Gas Law Online Quiz

What is the name of the phase change that exists when a solid turns into a liquid?

Quiz Preview

What type of relationship is shown between temperature and pressure?

Which of the following terms is used to describe the average kinetic energy of the molecules in a sample?

Carbon dioxide occupies a 2.54 L container at STP. What will be the volume when the pressure is 150 KPa and 26 C?

If the pressure exerted on a gas is tripled, what will happen to the volume (assuming the temperature and amount of gas remains constant)?

Which of the following is not a standard pressure measurement?

A balloon is inflated to a volume of 130 ml at a pressure of 690 mmHg. If the pressure is increased to 1000 mmHg, what will the new volume be?

The volume of a gas is increased from 150.0 mL to 350.0 mL by heating it. If the original temperature of the gas was 25.0 °C?

How many mm Hg is equal to 121 kPa?

In which of the following sets of conditions would a gas most act as a real gas?