1. Equations

2. Chemical Reaction When a substance goes through a reaction and changes into another substance.

3. Chemical Equations A formula which shows how elements or compounds react to form new compounds

4. 2H + + O -2  H 2 O

5. Parts of a chemical equations Reactants Yield Sign Products

6. Reactants The elements or compounds that are found on the left side of the yield sign

7. Yield Sign An arrow found in the equation which works like an equal sign

8. Products The elements or compounds that are found on the right side of the yield sign

9. Coefficient Is the number found in front of an ion or compound. It tells the number of that ion or compound you have

10. Balanced Equation For each element in a chemical equation, the same number of each element must be found on the left side of the arrow as on the right side

11. All chemical equations must be balanced.

12. To balance an equation, you can change the coefficient. However, you can never, never, never change the subscript.

13. Symbols used in Chemical Equations (l) The chemical is a liquid. (s) The chemical is a solid. (g) The chemical is a gas. (aq) The chemical is aqueous (dissolved in water).

14. Synthesis Reactions A reaction where the reactants combine to form a bigger compound (also known as combination)

15. Synthesis Reactions 2H + + O -2  H 2 O

16. Decomposition Reaction A reaction where the reactants break down (decompose)

17. Decomposition Reaction H 2 O  2H + + O -2

18. Single Displacement Reaction A reaction where one element replaces another element in a compound

19. Single Displacement Reaction 2Al 3+ + 3Ag 2 S  Al 2 S 3 + 6Ag 2+

20. Double Displacement Reactions A reaction where the positive ion of two compounds switch, which forms two new compounds

21. Double Displacement Reactions HCl + NaOH  NaCl + H 2 O

22. Combustion A reaction in which a compound (often carbon) reacts with oxygen

23. Combustion C + O 2  CO 2 CH 4 + 2O 2  CO 2 + 2H 2 O C 3 H 8 + 5O 2  3CO 2 + 4H 2 O C 6 H 12 O 6 + 6O 2  6CO 2 + 6H 2 O

24. Redox Reactions A reaction where one compound loses electrons and becomes a smaller compound, while another compound gains electrons and becomes a bigger compound.

25. Redox Reactions C 6 H 12 O 6 + 6O 2  6CO 2 + 6H 2 O

26. Oxidized Compound The compound that loses electrons and becomes a smaller compound

27. Reduced Compound The compound that gains electrons and becomes a bigger compound

28. Oxidation-Reduction Reaction Another name for the Redox Reaction