Velocities of Gases

The graph above shows the velocity distribution for a gas at 400 K. Which of the following graphs correspond to the same gas at 800 K?

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Tags

NGSS.HS-PS3-4

A high-temperature gas is compared to the same gas at lower temperature. Which of the following statements is true?

• Every molecule in the high-temperature gas is moving faster than every molecule in the low-temperature gas.

• The average molecular speed in the high-temperature gas is faster than the average molecular speed in the low temperature gas.

• Both A and B are true.

• Neither A nor B is true.

Tags

NGSS.HS-PS3-2

What Celsius temperature is closest to 431 K?

• A. 150°C

• 250°C

• 450°C

• 700°C

The graph above represents the velocity distribution of helium atoms at 800 K. The molar mass of helium gas is 4.009 g/mole. The molar mass of nitrogen gas is 28.014 g/mole. Which of the following graphs represents the velocity distribution of nitrogen molecules at 800 K?

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Tags

NGSS.HS-PS2-1

The formula for Kinetic energy is KE = 1/2 mv². How does raising the temperature of a gas affect the gases mass and velocity?

• mass goes up, velocity goes up

• mass goes down, velocity goes up

• mass is unchanged, velocity goes up

• mass is unchanged, velocity goes down

Tags

NGSS.HS-PS3-2