Average Kinetic Energy

Which of the following substances is made up of particles with the highest average kinetic energy?

• Fe(s) at 35ºC

• Br₂(l) at 20ºC

• H₂O() at 30ºC

• CO₂(g) at 25ºC

Tags

NGSS.HS-PS3-2

At which temperature would the molecules in a one gram sample of water have the lowest averagekinetic energy?

• 5ºC

• –100ºC

• 5 K

• 100 K

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NGSS.HS-PS3-2

As ice cools from 273 K to 263 K, the average kinetic energy of its molecules will

• increase

• decrease

• remain the same

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NGSS.HS-PS3-2

As a substance undergoes a change from the solid to the liquid phase, at constant temperature, the average kinetic energy of its molecules

• decrease

• increase

• remain the same

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NGSS.HS-PS3-2

The average kinetic energy of the molecules of a gas is directly proportional to the

• number of moles present

• volume occupied by individual gas molecules

• temperature measured on the Kelvin scale

• pressure at standard temperature

Different masses of copper and iron have the same temperature. Compared to the average kineticenergy of the copper atoms, the average kinetic energy of the iron atoms is

• less

• greater

• the same

At which conditions of temperature and pressure would the molecules of a gas have the greatest average kinetic energy?

• 0°C and 3 atm

• 10°C and 2 atm

• 50°C and 4 atm

• 100°C and 1 atm

The temperature of a substance is a measure of its particles

• average potential energy

• average kinetic energy

• specific heat

• total energy

Tags

NGSS.HS-PS3-2

As ice at 0ºC changes to water at 0ºC, the average kinetic energy of the ice molecules

• increase

• decrease

• remain the same

Tags

NGSS.HS-PS3-2

At which temperature does an aqueous solution of LiCl have the highest average kinetic energy?

• 100°C

• 200°C

• 273 K

• 373 K

Tags

NGSS.HS-PS3-2