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The melting point of the sample is

• -60 ºC

• 20 ºC

• 60 ºC

• 100 ºC

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

• Constant, changing

• Changing, constant

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

When water boils

• It gives off energy

• It absorbs energy

• Neither gives off nor absorbs energy

Which process takes the longest to occur?

• melting
• boiling
• freezing
• heating the solid

This type of graph is called a:

• Phase diagram
• Heating curve
• State of matter
• Temperature chart

If you boil water in a pot, some of the water becomes...

• water vapor

• precipitation

• evaporation

When a solid reaches the temperatures of its ___, it can become a liquid.

• melting point
• freezing point
• boiling point
• density

What is happening at water melting point?

• liquid to gas
• solid to liquid
• gas to liquid
• liquid to soild

What is happening at the boiling point?

• liquid to gas
• gas to liquid
• solid to liquid
• liquid to solid