A sealed flask containing 1.0 mole of H₂(g) and a sealed flask containing 2.0 moles of He(g) are at the same temperature. The two gases must have equal

• masses
• volumes
• average kinetic energies
• numbers of molecules

Tags

NGSS.MS-PS3-5

Two basic properties of the gas phase are

• a definite shape and a definite volume
• a definite shape but no definite volume
• no definite shape but a definite volume
• no definite shape and no definite volume

The temperature at which the solid and liquid phases of matter exist in equilibrium is called its

• melting point
• boiling point
• heat of fusion
• heat of vaporization

Tags

NGSS.MS-PS1-4

Which of the following is a quality that only gasses display?

• Spread out to fill all available space
• Take the shape of their container
• Can't be compressed
• All of these

What happens to the average kinetic energy of matter when it is heated?

• It increases
• It decreases 
• It doesn't change
• It cannot be determined

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

In which state of matter are the particles only vibrating?

• Gas
• Liquid
• Solid
• Plasma

The phase change going from a liquid to a solid is called...

• Melting
• Evaporation
• Sublimation
• Freezing

Tags

NGSS.MS-PS1-4

During a phase change, the temperature...

• Increases
• Decreases
• Does nothing

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

100 degrees Celsius is equal to _______ Kelvin. 

• 0 K
• 273 K
• 173 K
• 373 K

True or false: melting and freezing occur at the same temperature!

• True
• False
• I don't know

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4