2. 1. 2. 3.

3. 1. What is a chemical formula? 2. View examples of chemical formulas. 3. What is a coefficient? 4. What is a subscript? 5. Differentiate between a subscript and a coefficient in a chemical formula. 6. Identify reactants and products in a chemical equation? 7. Identify and count the number of atoms in a chemical equation. 8. Define the law of conservation of mass. 9. Observe examples balanced chemical equations. 10. Balance chemical equations.

4.  Chemical symbols are representations of elements on the periodic table.

5.  A chemical formula shows the elements that make up the compound and the number of atoms of each element in that compound.

6. CO 2 H2OH2O CO H3OH3O NaCl

7. H2OH2O H is the symbol for Hydrogen O is the symbol for Oxygen The subscript means the molecule of water has two atoms of hydrogen No subscript after oxygen means the molecule of water has only one atom of oxygen.

8. Coefficient H2OH2O 3 Molecule of Water The coefficient shows the number of molecules of the compound.

9. Identify the coefficient and or subscript. CO 2 H2OH2O 2MgO 2 2KOH 3AgNO 3 2AgNO 3 1. 2. 3. 4. 5. 6.

10.  A chemical equation is a representation of a chemical reaction on paper.

11.  2H 2 + O 2 2H 2 O  CaO + H 2 O Ca(OH) 2  C + O 2 CO 2

12.  Chemical equations area split up into two parts:  Reactants -the starting materials on the left side of the arrow  Products -the new substance or substances produced on the right side of the arrow.  Reactants Products

13. C + O2O2 CO2CO2 REACTANTS are the starting materials on the left side of the arrow. PRODUCT is the new substance or substances produced and are on the right side of the arrow. yields or produces

14.  Identify the reactants and products. 1. CH 4 + O 2 CO 2 + 2H 2 O 2. 3H 2 + N 2 2NH 3 3. 2H 2 + O 2 2H 2 O 4. CaO + H 2 O Ca(OH) 2

15.  Count the number of atoms in the chemical equation.  C + O 2 CO 2  How many carbon (C) atoms on each side?  How many oxygen (O) atoms on each side?

16.  Count the number of atoms in the chemical equation.  3H 2 + N 2 2NH 3  How many hydrogen (H) atoms on each side?  How many Nitrogen (N) atoms on each side?

17.  Count the number of atoms in the chemical equation.  2H 2 + O 2 2H 2 O  How many hydrogen (H) atoms on each side?  How many carbon (C) atoms on each side?

18.  Count the number of atoms in the chemical equation.  2Mg + O 2 2MgO  How many magnesium (Mg) atoms on each side?  How many oxygen (O) atoms on each side?

19.  Identify and count the number of atoms in the chemical equations. 1. CH 4 + 2O 2 CO 2 + 2H 2 O 2. 4Al + 3O 2 2Al 2 O 3 3. 2K + 2H 2 O 2KOH + H 2

21.  Mass (atoms) cannot be created nor destroyed in a chemical reaction.  What does that mean for us?  There must be the same number and kinds of atoms on each side of the chemical equation.

22. 10 atoms of O PP 4 O 10 O2O2 + 4 5 4 atoms of P 10 atoms of O = balanced

23. H + O 2  H 2 O H =1 atom O =2 atoms H =2 atoms O =1 atom = H + O 2  H 2 O2 O =2 atoms H =4 atoms 4 H =4 atom =

24. Mg + O 2  MgO Mg =O = 11 2 1 2 2 2 2 2

25. Ca + O 2  CaO Ca =O = 11 2 1 2 2 2 2 2

26. N 2 + H 2  NH 3 N = H = 12 2 3 2 6 2 3 6

27. Cu 2 O + C  Cu+ CO 2 Cu = O = C = 1 2 1 2 4 2 44 2 1 1

28. H 2 O 2  H 2 O + O 2 H =O = 22 2 3 2 4 4 2 4 4

29. 1. Mg + O 2 MgO 2. H 2 + N 2 NH 3 3. CH 4 + O 2 CO 2 + H 2 0 ? ? ?? ? ?