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5                                                                                                     6






                                   How many atoms of Hydrogen                                                                              How many atoms of Carbon


                                 are found on the reactant side?                                                                        are found on the product side?








                                       H   2       +   O         2            →               H O                                       CO + 3H                 2       → H O  +  CH                              4
                                                                                                   2
                                                                                                                                                                                        2









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                                                                                                      7                                                                                                      8






                                     Identify the reactants in the                                                                            Identify the products in the


                                                   equation below.                                                                                        equation below.







                                         HgO   → Hg   +   O                                         2                                  HCl + NaOH → H O + NaCl
                                                                                                                                                                                         2











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