Fill in the blanks.
7. When a chemical reaction occurs, atoms are rearranged to form a .
8. Water is not a because it has two kinds of elements that are chemically combined, and its molecules cannot be easily separated.
9. The production of gas when two substances are combined is evidence of a reaction.
11. Mirror turning foggy after a shower is an example of a change.
13. In a(n) chemical reaction, temperature increases.
14. Evidence that a chemical change or chemical reaction has occurred is the production of one or more .
15. In a(n) chemical reaction, temperature decreases.
16. Hydrogen peroxide bubbles when you put it on a cut which is evidence of a change and a reaction.
17. Baking a cake is an example of a(n) reaction.
19. Dripping ketchup on your shirt is a change.
20. Making a fruit salad is a change.
21. The first thing to happen in a chemical reaction is a substance is reversed to its parts.
22. When a new substance is formed with different properties than the original substance it is called a .
23. The factor that was changed when firewood is cut into small pieces which makes lighting a fire easier is increasing the .
24. If the reactants are heated in a chemical reaction, the reaction usually happens .
25. changes occur when bonds form between atoms, or when bonds break and new bonds form.
26. What kind of changes happen when you light a candle in a dark room?