chapter 5

1. releases heat, causing the temperature of the immediate surroundings to rise
4. developed the modern system of naming chemical substances
10. a character, usually a letter or number, that's printed slightly below and to the side of another character
11. the construction of complex chemical compounds from simpler ones
12. the minimum amount of energy that is required to activate atoms or molecules
14. a substance that delays slows or prevents a chemical reaction
16. an equation for a chemical reaction in which the number of atoms for each element in the reaction
18. is when parts of two ionic compounds are exchanged, making two new compounds

2. a representation of a chemical reaction using symbols of the elements to indicate the amount of substance
3. mass is neither created nor destroyed in chemical reactions
5. is a chemical reaction in which one reactant breaks down into two or more products
6. substances initially present in a chemical reaction are consumed during the reaction to make products
7. is a chemical reaction accompanied by the absorption of heat
8. a process that involves the rearrangement of the molecular or ionic structure of a substance
9. when oxygen combines with an element or a compound, forming an oxide
10. is a reaction in which one element is substituted for another element
13. proteins that help speed up metabolism, or the chemical reactions in our bodies
15. an insoluble solid that emerges from a liquid solution
17. A number placed in front of a formula to balance a chemical equation
19. a substance that is formed as the result of a chemical reaction
20. any substance that increases the rate of a reaction without itself being consumed