Thermochemistry

In what way does heat flow when solid A at 80 ℃ is placed in contact with solid B at 30 ℃?

• Heat rises, so it depends which solid was on top

• Heat flows from solid A to B. Solid A increases in temperature

• Heat flows from solid B to A. Solid B decreases in temperature

• Heat flows from solid A to B. Solid B increases in temperature

While the temperature increases

• Particles move slower

• Particles move faster

• The phase changes

• None of the above

This heat curve shows

• a sample decreasing in temperature

• a sample increasing in temperature

• a phase change

• more than one of the above

In this heat curve

• water would be warming up

• water would be losing energy

• water is gaining energy

• water is changing phase

Which heat curve would be an example of rain falling to the ground and then freezing

• 
• 
• 
• 

Where on the graph is the substance a solid?

• A to B

• B to C

• C to D

• D to E

• E to F

Where on the graph is the substance a gas?

• A to B

• B to C

• C to D

• D to E

• E to F

Where on the graph is the substance a liquid?

• A to B

• B to C

• C to D

• D to E

• E to F

Where on the graph is the kinetic energy remaining constant?

• A to B

• B to C

• C to D

• D to E

• E to F

What is happening from point "E to D" on the graph?

• The substance is condensing

• the substance is cooling down

• the substance is boiling

• The substance exists solely as a gas