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Math in Chemistry II ~ Unit Test PREP

Total questions: 50

Worksheet time: 2hrs 39mins

Name
Class
Date
1.
Which of the following is considered an empirical formula?
a)
CH3COOH
b)
C6H12O6
c)
H2O
2.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
3.
A formula with the lowest whole # ratio of elements in a compound is called
a)
Molecular Formula
b)
Chemical Formula
c)
Empirical Formula 
d)
Distance Formula
4.

What is the empirical formula for hydrogen peroxide which has a molecular formula of H2O2?

a)

HO

b)

H2O2

c)

H2O

5.

Which of the following is NOT an empirical formula?

a)

FeCl2

b)

C8H18

c)

C4H8O

d)

C3H8

6.

A compound with an empirical formula of CH2 has a molar mass of 70 g/mol. What is its molecular formula?

a)

C5H10

b)

C2H4

c)

CH2

d)

C4H8

7.
What is the percent composition by mass of oxygen in the compound MgSO4 (gram formula mass = 120 g/mol)?
a)
20%
b)
27%
c)
46%
d)
53%
8.
What is the molecular formula if the empirical formula is CH2O and the molecular molar mass is 180.18?
a)
CH2O
b)
C2H4O2
c)
C4H8O4
d)
C6H12O6
9.

Magnesium bromide (one magnesium atom with two bromine atoms) has a chemical formula of MgBr2. If you look at the total atomic mass of MgBr2, does magnesium or bromine make up more of the mass?

a)

bromine

b)

magnesium

c)

they are exactly the same

d)

it is impossible to tell

10.
What is the percent by mass of magnesium in MgO?
a)
20%
b)
40%
c)
50%
d)
60%
11.
Find the percent composition of Cu2S?
a)
%Cu= 67.987 %S= 32.013
b)
%Cu= 79.854   %S= 20.145
c)
%Cu= 35.946   %S= 64.054
12.

What is the ?

a)

1

b)

2

c)

3

d)

4

13.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
14.
Which of the following has the most number of O?
a)
2Mg3(PO4)2
b)
4AlPO4
c)
3Al(NO3)3
d)
15KOH
15.
Balance this equation.
_SnO2 +_H2-->_Sn +_H2O
a)
1,1,2,1
b)
1,2,1,1
c)
1,2,1,2
d)
1,2,2,1
16.
Balance this equation
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
17.

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?

__Ca + __H2O --> __Ca(OH)2 + __H2

a)
2,1 --> 2,1
b)
1,2 --> 1,1
c)
1,2 --> 2,4
d)
1,2 --> 2,1
18.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__CO + __Fe2O3--> __Fe + __CO2
a)
3,1 --> 2,3
b)
3,2 --> 1,1
c)
3,2 --> 2,4
d)
3,2 --> 2,1
19.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
20.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
6
c)
8
d)
24
21.
Balance this equation,            
Al2O3 --> Al + O2 
a)
Cannot be balanced
b)
2Al2O3 --> 2Al+3O2 
c)
2Al2O3--> 4Al+3O2 
d)
3Al2O3--> 2Al+O2 
22.

Given the following chemical equation:

4 Al + 3 O2 → 2 Al2O3

How many moles of aluminum oxide will be produced if 12 moles of aluminum are consumed?

a)

12

b)

4

c)

8

d)

6

23.

Given the following chemical equation:

CH4 + 2 O2 → 2 H2O + CO2

How many moles of oxygen must be consumed in order to produce 5 moles of carbon dioxide.

a)

10

b)

5

c)

8

d)

15

24.

For the Balanced Reaction:

3 Mg + 1 Fe2O3 → 3 MgO + 2 Fe

What is the ratio of moles of MgO to moles Fe?

a)

3 mol Mg : 2 mol Fe

b)

2 mol Mg : 3 mol Fe

c)

1 mol Fe : 2 mol Fe

d)

3 mol MgO : 2 mol Fe

25.

Given the equation

2KClO3 → 2KCl + 3O2

How many moles of oxygen are produced when 6.7 moles of KClO3 decompose completely?

a)

6.7 mol

b)

1.0 mol

c)

10.1 mol

d)

4.5 mol

26.
What is the first thing you must do to solve a stoichiometry problem?
a)
Write a Balanced Equation
b)
Panic
c)
Write an Unbalanced Equation
d)
Avogadro's Number
27.

2Al + 3H2SO4 --> Al2(SO4)3 + 3H2

How many grams of aluminum sulfate would be formed if 250 g H2SO4 completely reacted with aluminum?

a)
0.85 g
b)
290 g
c)
450 g
d)
870 g
28.

2 Na(s) + 2 H2O(l) → 2 NaOH(aq)+ H2(g)

How many grams of hydrogen gas are produced if 120 g of Na are available?

a)

5.2 g

b)
2.6 g
c)
690 g
d)
45 g
29.

CH4 + 2 O2 → CO2 + 2 H2O

How many grams of water are produced from the combustion of 110. g of CH4?

a)

247 g

b)

0.761 g

c)

61.8 g

d)

49.0 g

30.
One reactant into several products.
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
31.
Si + S8 --> Si2S4
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
32.
Pb(NO3)2 --> PbO + NO2 + O2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
33.

What is the correct way of representing hydrogen gas alone, in a reaction?

a)

2H

b)

H

c)

H2

34.

Predict the products of this synthesis reaction: H2 + Cl2 →

a)

HCl

b)

H2Cl2

c)

H2Cl

d)

HCl2

35.
4Si + S8 --> 2Si2S4
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Double displacement
36.
2Pb(NO3)2 --> 2PbO + 4NO2 + O2
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Combustion
37.
Which reaction type is the following: C5H10O4 + O2 --> CO2 + H2O
a)
Decomposition
b)
Single Replacement
c)
Combustion
d)
Double Replacement
38.
Which of the following is the general formula for a decomposition reaction?
a)
A + B  → AB
b)
AB → A + B
c)
AB + C → AC + B
d)
AB + CD → AC + BD
39.
When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced
a)
charge
b)
subscript
c)
random number
d)
coefficient
40.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
41.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
42.

Which of the following correctly describes a single replacement reaction?

a)

two elements combine to form a compound

b)

oxygen is necessary for the reaction to occur

c)

elements from two compounds replace each other

d)

one element replaces another element in a compound

43.

What type of reaction is this?

2 C6H14 + 19 O2 → 12 CO2 + 14 H2O

a)

Single Replacement

b)

Double Replacement

c)

Combustion

d)

Decomposition

44.

What type of reaction occurs between an element and a compound?

Zn + 2HCl --> ZnCl2 + H2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

45.

What type of reaction is the following:
BaCl2+2KI  → 2KCl + BaI2BaCl_2+2KI\ \ \rightarrow\ 2KCl\ +\ BaI_2  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

46.

The following reaction is an example of what reaction type?

CoCO3 → CoO + CO2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

47.
2 RbNO3 + BeF2 --> Be(NO3)2 + 2 RbF
a)
single displacement
b)
double displacment
c)
decomposition
d)
synthesis
48.
Which of the following is an example of synthesis?
a)
Na + Br2 --> NaBr
b)
KClO3 --> KCl + O2
c)
HgO + Cl2-->HgCl + O2
d)
Cl2 + NaBr --> NaCl + Br2
49.
2 AgNO3 + Cu --> Cu(NO3)2 + 2 Ag 
a)
single displacement
b)
double displacement
c)
decomposition
d)
synthesis
50.

When balancing equations what does the symbol →\rightarrow   mean?

a)
subscript
b)
equals
c)
it is just an arrow
d)

yields

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