Chemical Reactions

2. substance that speeds up the rate of a chemical reaction
7. A representation of a chemical reaction that uses symbols to show the relationship between the reactants and the products
8. The elements or compounds produced by a chemical reaction.
10. A reaction in which energy is absorbed
13. the principle stating that matter is not created or destroyed during a chemical reaction
15. A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
17. A chemical substance that is present at the start of a chemical reaction

1. A system in which no matter is allowed to enter or leave
3. A reaction in which one element replaces another in a compound or when two elements in different compounds trade places
4. A solid that forms from a solution during a chemical reaction.
5. A reaction that releases energy in the form of heat
6. Energy needed to get a reaction started
9. the process by which one or more substances change to produce one or more different substances
11. A system in which matter can enter from or escape to the surroundings.
12. A chemical reaction that breaks down compounds into simpler products.
14. combination
16. A substance that slows down or stops a chemical reaction