Chemical Reactions

4. a chemical reaction that requires thermal energy in order to proceed
6. substance used to speed up a chemical reaction
9. two or more substances combine to form another substance
11. SI unit for quantity of a substance that equals 6.022 X 10(23)
14. a shorthand method to describe a chemical reaction
16. thermal energy is given off during a chemical reaction
17. when the positive ion of one compound replaces the positive ion of another to create 2 new compounds
19. chemical reactions that release energy
20. a state of balance, in which forward and reverse processes occur at equal rates
21. represent the number of units of each substance taking part in a reaction
24. the chemical reaction in which one element replaces another element
25. states that ions, atoms, and moles must collide in order to react

1. the rate at which reaction turn into products
2. an insoluble compound that comes out of a solution during a chemical reaction
3. to gain electrons
5. energy absorbed during a chemical reaction usually in the form of thermal energy, light or electricity
7. when a substance reacts with oxygen to produce energy in the form of heat or light
8. when when substance breaks down to form or decomposes into 2 or more substances
10. loss of electrons
12. substances used to slow down chemical reactions
13. when an equation has the same of of atoms of an element on each side of the arrow
15. the mass in grams of 1 mole of a substance
18. the new substances produced in a chemical reaction
22. a change in which one or more substances change into new substance(s)
23. the starting substances that react