Heating/Cooling Curves

The melting point of the sample is

• -60 ºC

• -100 ºC

• 60 ºC

• 100 ºC

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

NaCl(s) was heated up starting at an initial temperature of 0°C. The heating curve is shown in the picture. What is the melting point of this substance?

• 0°C

• 801°C

• 1000°C

• 1465°C

Given the heating curve of water, what is happening to potential and kinetic energy during segment CD?

• the potential energy and kinetic energy both increase

• the potential energy increases while the kinetic energy decreases

• the potential energy is constant while the kinetic energy increases

• the potential energy increases while the kinetic energy is constant

In which region(s) does temperature increase?

• Region 1, 3, & 5
• Region 2 & 4
• Region 1 only
• Region 1 & 2

Between which points is the substance changing its state of matter?

• A-B only. 
• A-B, C-D, E-F
• B-C only. 
• B-C, D-E

Describe the substance between letters A and B. 

• Solid
• Liquid
• Melting
• Evaporating

freezing

• change of state from solid to liquid
• change of state from liquid to solid

melting

• change of state from solid to liquid
• change of state from liquid to solid

The freezing and melting points of water are the same.

• True
• False