8th Science Ch. 6

Which is an example of a physical property?

• ability to burn

• ductile

• ability to react with metals

A change in matter that produces new substances is called a

• chemical reaction

• physical change

• physical property

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Chemical equations must be balanced because chemical reactions obey the principal of

• activation

• conservation of matter

• decomposition

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In a chemical equation, the number in front of a chemical formula that tells how many atoms take part in the reaction is called the

• symbol

• concentration

• coefficient

When two or more substances combine to make a more complex substance, the process is called

• decomposition

• replacement

• synthesis

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In an exothermic reaction, the products have

• less energy than the reactants

• more energy than the reactants

• the same energy as the reactants

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Most inhibitors work by

• preventing reactions from coming together

• increasing the surface area of the reactants

• bringing reactants together

Which provides the activation energy to start a fire?

• fuel

• oxygen

• heat

Which cannot be used to put out a small fire?

• water

• oxygen

• baking soda

Reactions that release energy are called

• endothermic

• exothermic

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