Phase Changes

A gas condenses to a liquid at its boiling point.

• The process is exothermic

• The process is endothermic

The phase change from water vapor to liquid water is known as...

• evaporation
• precipitation
• condensation
• sublimation

Between which points is the temperature of the substance remaining constant?

• A-B only

• A-B, C-D, and E-F

• B-C only

• B-C and D-E

The energy transferred between objects that are at different temperatures is called

• Heat

• Temperature

• Energy

• Friction

In a heating curve, diagonal lines indicate temperature is __________, while flat lines indicate temperature is __________.

• Constant, changing

• Changing, constant

Heat (q) __________ depend on the amount of substance, while temperature __________.

• Does not, does

• Does, does not

Given the heating curve of a solid being heated at a constant rate, what is the boiling point of this substance?

• 20°C

• 50°C

• 110°C

• 170°C

What happens to particle movement/speed when energy is added?

• Particles slow down

• Particles go faster

• Particles don't move

• Particles stay the same speed

Two cups of water, one at 100^oC and the other at 50^oC are poured into a larger container. What would be the final temperature of the water?

• Less than 50^oC.

• Greater than 100^oC.

• Between  50^oC and 100^oC.

• The water temperature will rise and fall continually.

A measure of the average kinetic energy of the particles in a substance

• Enthalpy

• Energy

• Heat

• Temperature