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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