1. By: Angelique and Sharlanae

2. A formation of a percipitate can be a clue that a ______ ________ has taken place.

3.  Chemical reaction

4.  In a endothermic reaction, more _______ is absorbed than relesed.

5.  energy

6.  Many _______ makes up a chemical equation.

7.  Molecules

8.  What can increase the reaction rate in some chemical reactions?

9.  Stirring

10.  Give a clue to know how a chemical reaction has happened?

11.  Change in color  Change in temperature  Formation of a gas  Form of light

12.  What substances undergo a chemical change in a reaction?

13.  Reactants

14.  Adding heat can ______ reaction rates in most reactions.

15.  increase

16.  In a ________ there is not ________ in a compostition.

17.  Physical change  change

18.  What is needed to break chemical bonds?

19.  energy

20.  What ______ are listed after the arrow in a chemical equation?

21.  products