8th Chemical reactions

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In a chemical reaction, the sum of the masses of the products is equal to the sum of the

A change in matter that produces new substances is called a

Which of the following is not evidence of a chemical reaction

The rate of reaction can be decreased by increasing

which of the following cannot be used to put out a small fire?

When two or more substances combine to form a complex compound this process is called

If a reaction absorbs energy, it is called

A number that is written smaller and lower than the letter symbols in a chemical formula and that shows how many atoms of a substance are in a molecule is called