Paraffin Post Lab

What phase change occurred when the liquid paraffin changed into solid wax?

• Melting

• Freezing

• Condensing

• Evaporation

This is a cooling graph for a substance starting as a gas and cooling to a solid. Between which points is the substance completely a liquid and decreasing in temperature?

• A to B

• B to C

• C to D

• D to E

• E to F

This is a cooling graph for a substance starting as a gas and cooling to a solid. Between which points is the substance completely a gas and decreasing in temperature?

• A to B

• B to C

• C to D

• D to E

• E to F

This is a cooling graph for a substance starting as a gas and cooling to a solid. Between which points is the substance completely a solid and decreasing in temperature?

• A to B

• B to C

• C to D

• D to E

• E to F

This is a cooling graph for a substance starting as a gas and cooling to a solid. Between which points is the substance under going condensation from a gas to a liquid?

• A to B

• B to C

• C to D

• D to E

• E to F

This is a cooling graph for a substance starting as a gas and cooling to a solid. Between which points is the substance undergoing freezing from a liquid to a solid?

• A to B

• B to C

• C to D

• D to E

• E to F

What was happening to the temperature of the wax when freezing was occurring?

• It was staying about the same

• It was increasing rapidly

• It was decreasing rapidly

If the wax was left to sit in the classroom overnight, what temperature would it eventually reach?

• about 0 deg C

• about 5 deg C

• about 20 deg C

• about 50 deg C

This is an example of student data from the wax lab. How would you describe the shape of the line when the phase change is occurring?

• Diagonal with a negative slope

• Diagonal with a positive slope

• Mostly Vertical

• Mostly Horizontal

What happens to the temperature of a substance during a phase change?

• It increases

• It decreases

• It stays the same