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 ___ AlBr3 TYPE:

 

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

 

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

 

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

 

14.) ___ NaHCO3 ___ 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

 

16.) ___ Al(NO3)3 + ___K3PO4

 

17.) ___ ZnCrO4 + ___ Fe

 

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

 

19.) ___ LiCl + ___ F2

 

20.) ___ AgNO3 + (NH4)2CO3

 

 

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