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15 questions
Which of the following is an example of a chemical change?
water freezes to form ice
sugar dissolves in water
gasoline burns in a car engine
a piece of metal expands when it is heated
A change in the shape of an object is an example of _________________.
a chemical change
energy
an endothermic change
a physical change
Which one shows that a chemical reaction has occurred?
dissolving
melting
formation of a gas
bending
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