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22 ~ Math in Chemistry Practice

Total questions: 120

Worksheet time: 2hrs 26mins

Name
Class
Date
1.

In a chemical equation elements or compounds that are produced and are located the right side are called...

a)

reactants

b)

products

2.

In a chemical equation elements or products that enter a chemical equation and are located on the left side are called...

a)

reactants

b)

products

3.

The following tells us the number of molecules that are present in an equation.

a)

coefficient

b)

subscripts

c)

elements

4.

A ___________________ uses chemical formulas, plus signs, and an arrow to represent a chemical reaction

a)

chemical formula

b)

chemical equation

c)

element symbol

d)

inventory

5.

What is the correct "inventory" for KClO3

a)

K = 1 Cl = 3 O = 3

b)

K = 3 Cl = 3 O = 3

c)

K = 1 Cl = 1 O = 3

d)

K = 1 C = 1 l = 1 O = 3

6.

What is the coefficient in the formula?

a)

2

b)

N

c)

H

d)

3

7.
Identify the reactant(s) and product(s) of the reaction.
a)
All three are reactants and none are products.
b)
Hydrogen and water are the reactants, and oxygen is the product.
c)
Water and oxygen are the reactants, and hydrogen is the product.
d)
Hydrogen and oxygen are the reactants, and water is the product.
8.
In a reaction A + B ----> C,  reactant A has 5g and product  C has 9g. How many grams does reactant B should have? 
a)
4g
b)
5g
c)
9g
d)
14g
9.
Which of the following is considered an empirical formula?
a)
CH3COOH
b)
C6H12O6
c)
H2O
10.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
11.

A substance has an empirical formula of CH2 and a molar mass of 56 grams per mole. The molecular formula for this compound is

a)

CH2

b)

C4H6

c)

C4H8

d)

C8H4

12.
A formula with the lowest whole # ratio of elements in a compound is called
a)
empirical formula
b)
chemical formula
c)
covalent formula
d)
molecular formula
13.

What is the molecular formula of a compound that has a molecular mass of 54 and the empirical formula C2H3?

a)

C2H3

b)

C6H9

c)

C4H6

d)

C8H12

14.

What is the empirical formula of a compound with the molecular formula N2O4?

a)

NO

b)

N2O

c)

N2O3

d)

NO2

15.

Which pair consists of a molecular formula and its corresponding empirical formula?

a)

C2H2 and CH3CH3

b)

C6H6 and C2H2

c)

P4O10 and P2O5

d)

SO2 and SO3

16.
A formula with the lowest whole # ratio of elements in a compound is called
a)
empirical formula
b)
chemical formula
c)
covalent formula
d)
molecular formula
17.
A chemical formula that shows the actual # and kinds of atoms present in one molecule of a compound is called_________
a)
ionic formula
b)
covalent formula
c)
empirical formula
d)
molecular formula
18.
C2H6
a)
Empirical
b)
Molecular
19.
KMnO4
a)
Empirical
b)
Molecular
20.
What is the empirical formula for the following molecular formula: C5H12
a)
C5H12
b)
CH3
c)
CH2
d)
C2.5H6
21.
Which pair has the same empirical formula?
a)
NaCrO4 and Na2Cr2O7
b)
C2H4O2 and C6H12O6
c)
C3H6O3 and C2H6O2
d)
CH4 and C2H6
22.
What is the best definition for subscript?
 
a)
The big number that tells you the number of molecules.
b)
The atomic number
c)
The little number that tells the number of atoms for each element.
23.
What is the best definition for coefficient?
 
a)
The big number that tells you the number of molecules.
b)
The little number that tells the number of atoms for each element.
c)
The atomic number
24.
What is the molecular formula for a compound with the empirical formula: K2SO4 and a molecular mass of 696g.
a)
K2SO4 
b)
K8SO16
c)
K8S4O8 
d)
K8S4O16 
25.

Given two formulas representing the same compound:

a)

Formulas A and B are both empirical.

b)

Formulas A and B are both molecular.

c)

Formula A is empirical, and formula B is molecular.

d)

Formula A is molecular, and formula B is empirical.

26.

What is the percent composition by mass of nitrogen in NH4NO3 

(gram-formula mass = 80.0 grams/mole)?  Show all your work

4 lines
27.
Which represents the greatest mass of sulfur?
a)
1 gram of sulfur
b)
1 molecule of sulfur
c)
0.5 mole of sulfur
d)
6.02 x 1023 atoms of sulfur
28.
What is the mass of one mole of aluminum?
a)
27 g
b)
13 g
c)
54 g
d)
14 g
29.
What is the molar mass of CO2?
a)
12
b)
16
c)
32
d)
44
30.

How many moles of Al2O3 [aluminum oxide] is in a 40g sample?

a)
40%
b)
0.39
c)
4080
d)
2.55
31.

Determine the mass of one mole of Mg(OH)2 [magnesium hydroxide].

a)
58g
b)
42g
c)
82g
d)
41g
32.
Avogadro's number of representative particles is equal to one_____.
a)
kilogram
b)
gram
c)
kelvin
d)
mole
33.

The mass of one mole of an element is equal to

a)

its atomic number from the periodic table, but in amus.

b)

its atomic mass from the periodic table, but in amus.

c)

its atomic mass from the periodic table, but in grams.

d)

its atomic number from the periodic table, but in grams.

34.

What is a mole?

a)

We're in chemistry, so we are not talking about the little creature that digs holes , live underground and eats worms.

b)

A BIG number

c)

6.02 x 1023 of anything

d)

All of these

35.

You try it. One mole of NaF, sodium fluoride, will have a mass of

a)

41.99g

b)

20g

c)

41.99 amu's

d)

20amu's

36.

What is the gram formula mass for Mg(OH)2?

a)

41.3g

b)

58.32g

c)

65.6g

37.

Determine the amount of moles in CuBr that are in 276.9 g of the compound.

a)

3.2 mol

b)

1.7 mol

c)

2.1 mol

d)

1.9 mol

38.

Determine the number of moles of Mg3P2 that are in 583 g of the compound.

a)

2.9 mol

b)

6.1 mol

c)

4.3 mol

d)

1.7 mol

39.
What is the mass of 0.75 moles of (NH4)3PO4?
a)
101.75 g
b)
121.75 g
c)
111.75 g
d)
131.75 g
40.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
41.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
2
c)
8
d)
24
42.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
43.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
44.
Balance this equation...
HgO --> Hg + O2
a)
It is balanced 
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
d)
I don't know...Oh well!
45.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
46.
Which coefficients balance this equation:
NH3  +  O2 ---->   NO  + H2O
a)
2,3,5,6
b)
5,5,4,6
c)
4,6,4,5
d)
4,5,4,6
47.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
a)
1,2,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
0,2,0,2
48.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
49.
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
50.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
51.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
52.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
53.
How many Mn atoms are found in the following compound?
3Cr(MnO4)6
a)
3
b)
4
c)
6
d)
18
54.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
55.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
56.
What is the number before a chemical formula called?
Ex: 2H2 + O2 --> 2H2O
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
57.
How many aluminum atoms are in Al2(SO4)3?
a)
1
b)
2
c)
3
d)
4
58.
How many atoms are in the neurotransmitter serotonin? The formula for serotonin is C10H12N2O
a)
10
b)
20
c)
25
d)
23
59.
Which of the following equations are correctly balanced?
a)
12CO2 +H2O --> C6H12O6 + O2
b)
CO2 + 9H2O --> C6H12O6 + O2
c)
CO2 + H2O --> 3C6H12O6 + O2
d)
6CO2 + 6H2O --> C6H12O6 + 6O2
60.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
61.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
62.
What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?__FeCl3 + __Ca(OH)2 --> __Fe(OH)3 + __CaCl2
a)
4,3--> 2,1
b)
3,2 --> 3,1
c)
2,3 --> 2,2
d)
2,3 --> 2,3
63.

A chemical reaction occurs when one or more _____ change into one or more new substances called ______ .

a)

products / reactants

b)

chemicals / reactants

c)

reactants / chemicals

d)

reactants / products

64.

A representation of a chemical reaction is called a(n) _____________ .

a)

chemical change

b)

chemical equation

c)

physical change

d)

physical reaction

65.

In the equation:

Li + Br2 -----> LiBr

What are/is the reactant(s)

a)

Li and Br2

b)

Li

c)

Br2

d)

LiBr

66.

In the equation:

Li + Br2 -----> LiBr

What are/is the product(s)

a)

Li

b)

Br2

c)

LiBr

d)

Li and Br2

67.

A ____________ is a new material produced as the result of a chemical reaction.

a)

catalyst

b)

reactant

c)

product

d)

element

68.

A catalyst is NOT used up in a chemical reaction

a)

True

b)

False

69.

Which of the following does NOT contain a type of chemical reaction?

a)

sythesis / decomposition

b)

single replacement / double replacement

c)

synthesis / combustion

d)

molecular / empiricle

70.

The presence of a + sign between reactants is a characteristic of a __________ reaction

a)

decomposition

b)

synthesis

c)

single replacement

d)

double replacement

71.

Rapid decomposition reactions can cause __________ as a result of the formation of gases and heat.

a)

explosions

b)

tarnishing

c)

freezing

d)

boiling

72.

A _____________ equation is one in which the relative amounts of the materials is NOT represented (it may not be balanced)

a)

skeleton

b)

decomposition

c)

synthesis

d)

chemical

73.

A + B -----> C

a)

synthesis reaction

b)

decomposition reaction

c)

single replacement reaction

d)

double replacement reaction

74.

A + O2 yields B + CO2

a)

synthesis reaction

b)

decomposition reaction

c)

combustion reaction

d)

single replacement reaction

75.

AB + C -----> AC + B

a)

synthesis reaction

b)

single replacement reaction

c)

decomposition reaction

d)

double replacement reaction

76.

AB + CD yields AD + CB

a)

decomposition reaction

b)

combustion reaction

c)

double replacement reaction

d)

single replacement reaction

77.

AB -----> A + B

a)

synthesis reaction

b)

decomposition reaction

c)

single replacement reaction

d)

double replacement reaction

78.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
79.
CaCO3 represents a chemical
a)
Symbol
b)
Formula
c)
Subscript
d)
Reaction
80.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
81.
How many Oxygen (O) atoms are in 2C2HO8Cl2
a)
2
b)
16
c)
8
d)
5
82.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
83.

The red numbers in the image below represent ________

a)

subscripts

b)

coefficients

c)

exponents

d)

None of the answers are correct

84.

The blue numbers in the image below represent ________

a)

exponents

b)

coefficients

c)

subscripts

d)

none of the answers are correct

85.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
86.
In a chemical reaction, everything to the rightof the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
87.
This pictures simulates what type of reaction?
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
88.
What type a reaction is taking place in this picture?
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
89.

When balancing equations what does

----> mean?

a)

subscript

b)

equals

c)

it is just an arrow

d)

yield

90.

A substance that exists before a chemical reaction takes place and changes as a result of the reaction.

a)

product

b)

reactant

c)

property

d)

chemical

91.

4Si + S8 → 2Si2S4

a)

Synthesis (combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

92.

3Ca + 2AlCl3 → 3CaCl2 + 2Al

a)

Synthesis (combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

93.

Classify the following unbalanced equation...

KOH + H3PO4 → K3PO4 + H2O

a)

Synthesis (combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

94.
What is this reaction?
Zn + CuCl2--> ZnCl2 + Cu
a)
synthesis
b)
single replacement
c)
double replacement
d)
decomposition
95.
In the equation,          2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
96.
What type of chemical reaction is this one?
C2H2 + O2 --> CO2 + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
97.

How many atoms of aluminum are on each side of the following equation:

4Al + 3O2 --> 2Al2 O3

a)

2

b)

6

c)

1

d)

4

98.

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

99.

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

100.
Given the following chemical equation: 4 Al  +  3 O2  →  2 Al2O3. How many moles of aluminum oxide will be produced if 12 moles of oxygen are consumed?
a)
8
b)
12
c)
4
d)
6
101.

Given the following chemical equation:

2 Al + 3 CuCl2 → 3 Cu + 2 AlCl3

How many moles of copper (II) chloride must be consumed in order to produce 12 moles of aluminum chloride?

a)

14

b)

6

c)

12

d)

18

102.

In the reaction

2RbNO3 → 2RbNO2 + O2

how many moles of O2 are produced when 5.0 mol of RbNO3 decompose?

a)

1.0 mol

b)

2.5 mol

c)

3.0 mol

d)

7.5 mol

103.

Given the equation

N2 + 3H2 --> 2NH3

what is the total number of moles of NH3 produced when 10 moles of H2 reacts completely with N2?

a)

6.7

b)

2.0

c)

3.0

d)

15.0

104.

Balance the following reaction and determine the mole ratio

CaC₂(s) + H₂O(l) ---> C₂H₂(g) + Ca(OH)₂(aq)

a)

1:2 --> 2:2

b)

1:2 --> 1:1

c)

2:1 --> 1:1

d)

2:1 --> 2:1

105.
2H2   +   O2  →  2H2O
How many moles of water can be produced if 8 moles H2 are used?
a)
4 moles
b)
8 moles
c)
16 moles
d)
2 moles
106.
N2 +  3H2 → 2NH3 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
a)
6
b)
2
c)
3
d)
1
107.

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

108.

In the equation

2Al2O3 --> 4Al + 3O2

what is the mole ratio of aluminum to oxygen?

a)

10:6

b)

3:4

c)

4:3

d)

2:3

109.

Given the equation

2Na + S -->Na2S

What is the total number of moles of S that reacts when 4.0 moles of Na were completely consumed?

a)

1

b)

2

c)

0.5

d)

4

110.

Given the equation

4NH3 + 5O2-->4NO + 6H2O

What is the total number of moles of H2O produced when 12 mole of NH3 is completely consumed?

a)

15

b)

18

c)

20

d)

24

111.

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

112.
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
113.

In the reaction

2H2 + O2 → 2H2O

what is the mole ratio of oxygen to water?

a)

1:2

b)

2:1

c)

3:4

d)

4:3

114.
6CO2 + 6H2O --> C6H12O6 + 6O2 
What is the total number of moles of water needed to make 2.5 moles of C6H12O6?
a)
2.5
b)
6
c)
12
d)
15
115.

What is the mole ratio of H2O to H3PO4 in the following chemical equation?  

P4O10 + 6 H2O --> 4 H3PO4 

a)
6:4
b)
4:6
c)
1:3
d)
3:1
116.
Using the following equation:
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(l)
How many moles of iron can be made from  6 moles H2? 
a)
4 moles Fe
b)
6 moles Fe
c)
9 moles Fe
d)
2 moles Fe
117.

Mole ratios are obtained from a

a)

balanced chemical equation

b)

periodic table

c)

molar mass

118.

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

119.
What is the molar mass of Mg(NO3)2
a)
148.313g/mol
b)
134.306g/mol
c)
54.311g/mol
120.
Molar mass is in units of ________.
a)
grams
b)
grams/mole
c)
mole
d)
moles/gram

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