AP Chemistry: 3.5-3.8

If a gas has the same temperature throughout, which gas molecule has the highest average velocity?

• O₂

• H₂O

• H₂

• Xe

Tags

NGSS.HS-PS3-2

Which condition is necessary for most gases to behave nearly ideally?

• high pressure

• high temperature

• low compressibility

• low expansion

Which among the following is true about Kinetic Molecular Theory?

• Gases do not move in straight line.

• Most of the volume of gas is empty space.

• Gas particles are not in constant random motion.

• Gas particles attract each other.

Tags

NGSS.HS-PS3-2

Even more so when they're close together, particles in real gases are ___

• attracted to each other

• repelled by each other

• massless

• mystical vapors

Tags

NGSS.HS-PS1-3

What happens to a real gas at high pressure that makes it become less ideal?

• particles lose energy and so exert less pressure

• particles gain energy and so exert more pressure

• container volume decreases so particles occupy significant volume

• container volume increases so particles occupy significant volume

At 25°C, which of the following gases will have the greatest velocity?

• He

• CO₂

• CH₄

• N₂

An ideal gas is heated from 25°C to 80°C in a sealed container at constant volume. Which of the following statements is true?

I The partial pressure of the gas increases

II The average distance between the gas particles decreases.

III The average kinetic energy of the gas particles increases.

IV The number of collisions between the gas particles and the sides of the container decreases.

• I and IV

• I and II

• I, II, and IV

• I and III

Tags

NGSS.HS-PS1-5

The substance that does the dissolving

• Solute

• Solvent

• Solution

• Miscibility

Which of the following would be the MOST soluble in water?

• CH₄

• CO₂

• NH₃

Tags

NGSS.HS-PS1-3

NGSS.HS-ESS2-5

2.45 mole of LiBr is dissolved to make a 0.750 L of solution. What is the molarity?

• 3.27 M

• 0.306 M

• 0.0376 M