1. Chemical Reactions

2. Chemical Reaction- a well- defined example of a chemical change
Chemical Reaction- a well- defined example of a chemical change. One or more substances are changed into new substances.

3. What makes up a chemical reaction?
Reactants- substances you start with
2. Products- substances you end with
Reactants → Products

4. Balanced chemical equation- same number of atoms of each element on both sides of the equation.
Remember atoms are rearranged but never lost or destroyed.

5. Writing a balanced chemical equation
Reactant on left side and products on the right side.
Check for atom balance
Choose coefficients that balance the equation.

6. Coefficients- numbers that represent the number of units of each substance taking part in a reaction.

7. Ex:
Reactants Products
_LiF + _Br2 → _LiBr +_ F2

8. Reactants Products
2LiF + _Br2 → _LiBr +_ F2

9. Reactants Products
2LiF + _Br2 → 2LiBr +_ F2

10. _Mg + _O2 → _MgO
_AgNO3 + _NaCl → _AgCl + _NaNO3
_MgCl2 + _Na2CO3 → _MgCO3 + _NaCl

11. 4. _NaBr + _Cl2→_NaCl +_Br2
5. _Cu + _S → _Cu2S
6. _Al(OH)3 + _CO2 → _Al(HCO3)3

12. 7. _Na + _H2O → _NaOH + _H2