Physical Science - Chapter 9

When a substance changes from a liquid to a gas, it is said to ___.

• condense

• expand

• evaporate

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Which of the following best describes a calorie?

• a unit of heat

• 1 gram of water

• a unit of measurement on a temperature scale

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Heat can travel through space by a means of ___.

• contraction

• condensation

• radiation

Metal bridges are build with expansion joints because in the summer ___.

• the hot metal evaporates

• metal contracts in the sun

• some metals can reach the boiling point.

What happens at the melting point?

• solid substance change to water

• solid changes to liquid

• most liquids change to ice

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How much heat is added when 22 grams of water are heated from 10 degrees Celsius to 15 degrees Celsius?

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How much heat is given off when 10 grams of water are cooled from 50 degrees Celsius to 37 degrees Celsius?

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How much heat is given off when 22 grams of water are cooled from 80 degrees Celsius to 37 degree Celsius?

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How much heat is added when 10 grams of water are heated from 5 degrees Celsius to 100 degrees Celsius?

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Under normal conditions, water boils at ___.

• 100 degree Fahrenheit

• 212 degrees Fahrenheit

• 212 degrees Celsius

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