Chapter 3.4 Review

2. the number that is placed in front of a chemical formula
8. describes how fast a reaction occurs
9. the process in which atoms are rearranged to produce new substances
11. more reactants in a given volume
12. uses chemical symbols and numbers to represent a given substance
14. states that matter is neither created nor destroyed in ordinary physical and chemical changes
15. energy released to the surroundings, reation mixtures often feel warm
16. numbers written below and to the right of a chemical symbol
18. an arrow that points from reactants to the products
19. substances that participate in a chemical reaction

1. particles move faster when this is higher which allows for more particle collision and a higher rate of reaction
3. an expression that uses symbols to show the relationship between the starting substances and the substances that are produced by a chemical reaction
4. states that energy cannot be created or destroyed, energy can change form
5. what you would do to a chemical equation in order to ensure that the reactants and products contain the same number of atoms of each
6. substances formed in a reaction
7. a solid that can be formed during a chemical reaction, a sign that a chemical reaction has occurred
10. requires an input of energy, energy taken in from surroundings, reactions mixtures often feel cold
13. subsatnce that changes the rate of a chemical reaction without being used up or changed very much
17. to increase this, you can crush or grind solids