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

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

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

What line segment represents only the solid state?

• A-B
• B-C
• C-D
• D-E

In which segment is the kinetic energy remaining constant?

• A-B
• B-C
• C-D
• E-F

Which process takes the longest to occur?

• melting
• boiling
• freezing
• heating the solid

What state(s) of matter are present at D-E?

• Solid-liquid
• Liquid
• Liquid-gas
• Gas-Solid

Between which points is the temperature of the substance increasing?

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

NaCl was heated 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

In which region(s) does temperature increase?

• Region C only

• Regions B and D

• Regions A, C, and E

• Regions A and B