1. Compounds

2. Compound – a substance made up of two or more elements. It can be broken down into other substances. Could be two of the same element! Could be from two or more different elements.

3. Compounds are identified by chemical formulas oxygen hydrogen H2OH2O HH O CHEMICAL FORMULA

4. Once the formula is decided upon then it is given a name. oxygen hydrogen H2OH2O HH O CHEMICAL FORMULA Water

5. How to write compounds. If there is a Carbon atom it will be listed first, then all others in ABC order. If there is a Carbon and Hydrogen, Carbon will be listed first then the Hydrogen, then others in ABC order. If there are no Carbon atoms then the elements will be listed in ABC order.

6. Hydrogen Carbon Oxygen Nitrogen H2OH2O CO 2 NH 3 What is the formula for the following compounds

7. How to balance chemical equations Chemical equations are like math equations, in that they need to be equal on both sides of the = sign. ie 2+2 = 4 Chemical equations are seperated by a arrow instead of an equal sign. ie H + O HO 2H + O H 2 O 4H + O 2 2H 2 O

8. 2N 2 O 5 4NO 2 + O 2 Which of the following equation is balanced? Cl+ Ag 2AgCl