2.2 What Burns? What Melts? Quiz

What is the phase change from the solid phase to the liquid phase called?

• Melting

• Condensation

• Evaporation

• Freezing

Tags

NGSS.MS-PS1-4

What happens to the molecules in a solid chocolate bar when energy is added to it?

• They become smaller

• They turn into gas

• They stop moving

• They gain energy and move around more

Tags

NGSS.MS-PS1-4

What is burning also known as?

• Freezing

• Evaporation

• Combustion

• Condensation

Tags

NGSS.MS-PS1-5

At what temperature do wood molecules begin to break down and react with oxygen?

• 200°C

• 150°C

• 250°C

• 100°C

Tags

NGSS.MS-PS1-4

What is left behind as ash when wood burns?

• Oxygen

• Unburned wood residue

• Carbon dioxide

• Water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What causes the fire to go out?

• Running out of oxygen

• Running out of fuel

• Decrease in temperature

• Adding new logs

What is the temperature at which a material melts called?

• Freezing point

• Melting point

• Boiling point

• Flash point

What is the temperature at which a material burns called?

• Melting point

• Boiling point

• Flash point

• Freezing point

Tags

NGSS.MS-PS3-4

Why does wood burn while chocolate melts near a campfire?

• Wood has a lower melting point than chocolate

• Wood has a lower flash point than chocolate

• Chocolate has a lower flash point than wood

• Chocolate has a lower melting point than wood

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is the cause of combustion?

• Addition of water

• Decrease in temperature

• Molecules reacting with oxygen

• Increase in pressure