Vocabulary Skills:  Applying Definitions
        On the diagram below, label correctly each of the following:

                    chemical formula                                            chemical equation
                     coefficient                                                        subscript

Writing Formulas:  Applying the Main Ideas
        The drawing below show molecules of various compounds.  Under each drawing, write the correct formula for the compound.

Completing Equations

    Chemical changes are characterized by the formation of new substances.  The products of a correctly balanced chemical equation represent the number and kind of new substances formed.  There are four general types of reactions : Synthesis, decomposition, single replacement, and double replacement.
    Examine each equation listed below and identify which type of reaction is taking place by filing in the blank space to the right of th equation.
    Then balance the equation.  Remember to use coefficients, not subscripts, to balance the equation.

1.      Al  +  O₂ -->  Al₂O₃                                                    _______________________________________________
 

2.  HgO  -->  Hg  +  O₂                                                        _________________________________________________
 

3.  NaOH +   H₂SO₄  --> Na₂SO₄   +  H₂O                         _________________________________________________
 

4.  Fe  +  O₂  -->   Fe₂O₃                                                    __________________________________________________
 

5.  Pb(NO3)₂  +  K₂CrO₄    -->   PbCrO₄   +   KNO₃      __________________________________________________
 

6.  H₂  +  N₂  -->    NH₃                                                      ___________________________________________________
 

7.  Fe  +  CuCl₂  -->  FeCl₂   +  Cu                                    ___________________________________________________
 

8.  KClO₃  -->  KCl   +   O_{2                                                ____________________________________________________________}
 

9.  Mg  +  HCl  -->  H₂  +  MgCl₂                                    _______________________________________________________