UNITS 7B & 8 REVIEW SHEET

Part 1 – Oxidation Numbers – Find the oxidation number of the underlined element in each compound.

 

1.)  NO2

 

2.)  Ca(ClO)2

 

3.)  K2C2O4

 

Part 2 – Percent Composition – Find the percent by mass of the underlined element in each compound.

 

4.)  (NH4)2SO4

 

5.)  Ca(ClO)2

 

6.)  K2C2O4

 

Part 3 – Empirical and Molecular Formulas – Solve the following problems.

 

7.)  What is the empirical formula of a compound that contains 40.5 % zinc, 19.9 % sulfur, and 39.6 % oxygen?

 

 

8.)  A compound contains 43.7 % phosphorus and 56.3 % oxygen.  What is the empirical formula for this compound?  If this compound has a molar mass of 243 g/mole, what is its molecular formula?

 

 

9.)  Complete the following data table.

 

 

Trial 1

7

Moles of water

 

1

Mass of empty test tube (g)

7.35

8

Molar mass of anhydrous salt: MgSO4

 

2

Mass of hydrate & test tube (g)

7.84

9

Mass of anhydrous salt (g)

 

3

Mass after 1st heating (g)

7.61

10

Moles of anhydrous salt

 

4

Mass after 2nd heating (g)

7.59

11

Mole ratio between H2O and anhydrous salt

 

5

Constant mass of anhydrous salt & test tube (g)

 

12

Experimental empirical formula

 

6

Mass of water driven off (g)

 

13

Theoretical empirical formula

MgSO4 . 7 H2O

 

Part 4 – Equations – Balance and identify the type of equation for the following reactions.

 

10.)  ___ Al  +  ___ Br2  à  ___ AlBr3                                                       TYPE:

 

11.)  ___ Na3PO4  +  ___ ZnSO4  à  ___ Na2SO4  +  ___ Zn3(PO4)2               TYPE:

 

12.)  ___ Zn  +  ___ HCl  à  ___ ZnCl2  +  ___ H2                                      TYPE:

 

13.)  ___ C2H4  +  ___ O2  à  ___ CO2  +  ___ H2O                                    TYPE:

 

14.)  ___ NaHCO3  à  ___ Na2O  +  ___ CO2  +  ___ H2O                            TYPE:

 

Part 5 – Predicting Products – Decide if the following reactions happen or not.  If a reaction does occur, write the formula(s) for the products and balance the equation.

 

15.)  ___ Na  +  ___ MnO2  à

 

16.)  ___ Al(NO3)3  +  ___K3PO4  à

 

17.)  ___ ZnCrO4  +  ___ Fe  à

 

18.)  ___ Mg(C2H3O2)2  +  ___ BaCl2  à

 

19.)  ___ LiCl  +  ___ F2  à

 

20.)  ___ AgNO3  +  (NH4)2CO3  à

 

 

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