Boiling and Freezing Points

What unit of measurement is used when recording the temperature of boiling water?  5.2c

• milliliter
• degrees Celsius
• gram
• millimeter

A glass beaker is placed on a hot plate.  Five hundred milliliters of room temperature water are added to the beaker.  If the temperature continues to increase, the water in the beaker will most likely - 

• turn into a solid
• become more dense
• turn into a gas
• show no change in temperature

Each of the following scenarios demonstrates (shows) freezing point EXCEPT - 

• a liquid changing into a solid
• the temperature reaching 100 degrees Celsius
• liquid precipitation turning into freezing rain
• the temperature reaching 0 degrees Celsius

Water changes its state of matter when heat is added or taken away.  When water reaches its boiling point the particles-

• are closer together
• stay the same
• are moving more rapidly
• are moving more slowly

Is the temperature, 0 degrees Celsius, show the melting, freezing, or boiling point of water?

• freezing point
• melting point
• boiling point
• both freezing point and melting point

Students make ice cream to investigate matter and its properties.  The students add salt to the ice cream maker so that the mixture will change from a liquid to a solid.  Which conclusion provides the most important reason salt is used to make ice cream solidify?  5.2f

• Salt dissolves in water.
• Salt adds flavor to the ice cream.
• Salt evaporates in water.
• Salt lowers the freezing point of water.

The temperature of water in a beaker measures 87 degrees Celsius.  How many more degrees must the temperature increase to reach the boiling point?

• 23 degrees Celsius
• 212 degrees Celsius
• 13 degrees Celsius
• 100 degrees Celsius

Which safety precaution must be taken when investigating the boiling point of water?

• Report any changes in temperature
• Make sure to record your data
• Always wear goggles
• Only use gloves and an apron