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Review Conservation of Atoms and Equilibrium

Total questions: 92

Worksheet time: 6hrs 30mins

Name
Class
Date
1.

Number placed in front of a chemical formula that tells how many molecules are present.

a)

product

b)

coefficient

c)

reactant

d)

subscript

2.

Substances that form as the result of a chemical reaction found on the right hand side of the chemical equation

a)

products

b)

reactants

c)

coefficients

d)

subscripts

3.

How many iron (Fe) atoms are in

FeNO3

a)

1

b)

2

c)

3

d)

6

4.

How many oxygen atoms are in

FeNO3

a)

1

b)

2

c)

3

d)

6

5.

Where do we see carbon in the following chemical reaction? (Choose all that apply)

A
B
C
D
E
F
G
H
I
J
6.

Where do we see oxygen in the following chemical reaction? (Choose all that apply)

A
B
C
D
E
F
G
H
I
J
7.
In the reaction AB-----> A + B reactant AB has 12g and product B has 5g. How many grams should product A have?
a)
17g
b)
2g
c)
7g
d)
None of the above
8.
__Na + __Cl2 --> __NaCl
a)
1,1,2
b)
2,1,2
c)
2,1,1
d)
already balanced
9.
__NaClO3 --> __NaCl + __O2
a)
2,2,2
b)
2,2,3
c)
3,2,2
d)
1,2,3
10.
__C6H12O6 + __O2 --> __H2O + __CO2
a)
1,6,6,6
b)
already balanced
c)
1,6,1,6
d)
2,12,12,12
11.
Balance this equation:
MgCl2 --> Mg4+ Cl2
a)
It's already balanced.
b)
4MgCl2 --> Mg4+ 4Cl2
c)
4MgCl2 --> Mg4+ 5Cl2
12.
Fill in the blanks with coefficient:
PCl5+_ H2O→_ HCl+H3PO4
a)
4, 5
b)
1, 6
c)
3, 8
d)
2,2
13.

For the following chemical reaction, which substance is a reactant?

2HBr + Mg(OH)2 → MgBr2 +2H2O2HBr\ +\ Mg\left(OH\right)_2\ →\ MgBr_2\ +2H_2O  

a)

MgBr2MgBr_2  

b)

BrBr  

c)

Mg

d)

HBr

14.

How many oxygen atoms do I have in the following compound?

2(NH4)3PO42\left(NH_4\right)_3PO_4  

a)

4

b)

6

c)

8

d)

24

15.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
16.

What are the coefficients that would properly balance this 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

17.

What are the coefficients that would properly balance this equation?

__AgNO3 + __H2S --> __Ag2S+ __HNO3

a)

2,1 --> 1,2

b)

1,2 --> 1,1

c)

1,2 --> 1,2

d)

1,2 --> 2,1

18.

What are the coefficients that would properly balance this equation?

__Al + __O2--> __Al2O3

a)

4,1 --> 2

b)

4,3 --> 4

c)

3,4 --> 1

d)

4,3 --> 2

19.

Determine the coefficients to make the following equation balanced?

__N2 + __O2--> __NO

a)

1, 1, 1

b)

1, 1, 2

c)

2, 2, 2

d)

1, 2, 2

20.

Balance the the following equation.

__Zn+__HCl -->__ZnCl2 +__H2

a)

1,1,2,1

b)

1,1,1,2

c)

1,2,1,1

d)

2,1,1,1

21.
Which number should go in the blank?
Al(NO3)3 + _  NaOH -> Al(OH)3 + 3 NaNO3
a)
1
b)
2
c)
3
d)
0
22.
The numbers needed to balance the equation are:
a)
2, 7, 6, 4
b)
2, 1, 3, 2
c)
1, 1, 3, 2
d)
2, 3, 1, 3
23.

How many HCl molecules do you need to balance this equation?

2Mg + ​ (a)   HCl ---> 2MgCl2 + 2H2

Choose from the below words
4
1
2
3
24.

Drag and drop the coefficients that balance this equation 2 FeFe   + ​ (a)   Cl2Cl_2  ---->  ​ (b)     FeCl3FeCl_3  

Choose from the below words
3
2
25.

Balance this equation. _CF4 + _Br2 → _CBr4 + _F2

a)

3,1,2,1

b)

1,2,1,2

c)

2,2,2,2

26.
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

27.

What's unbalanced about this equation? 

Al + O2 --> Al2O3

a)

Oxygen (O) only

b)

Aluminum (Al) only

c)

Both oxygen and aluminum

d)

Nothing; it is balanced.

28.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number in front of a chemical formula.
c)
The number in between the chemical symbols.
d)
The number behind a chemical formula.
29.

Determine the coefficients to balance the equation.

__Al +__HCl --> __H2 +__AlCl3

a)

2,6,3,2

b)

it's already balanced

c)

4,12,3,4

d)

2,1,4,5

30.
Is the following equation balanced?
4Fe + 3O2 --> 2Fe2O3
a)
yes
b)
no
31.

Balance the equation.

__Mg + __Cl2 --> __MgCl2

a)

1, 2,1

b)

already balanced

c)

2,1,1

d)

1,1,2

32.

How many Hydrogen atoms are in 4H2O?

a)

6

b)

8

c)

2

d)

4

33.

How many Nitrogen atoms are in (NH₄)₂CrO₄?

a)

1

b)

2

c)

8

d)

6

34.

A subscript is the small number below the element symbol that tells the number of _______ of that element.

a)

atoms

b)

valence electrons

c)

protons

d)

elements

35.

Balance this equation:

HgO ---> Hg + O2

a)

It is balanced.

b)

2HgO ---> 2Hg + O2

c)

2HgO ---> Hg + O2

d)

HgO ---> Hg + 2O2

36.
Balance this equation:
P4+O2  -->  P2O3
a)
3 P4+ O2 --> 2 P2O3
b)
 P4+ O2 --> 2 P2O3
c)
 P4+ 3 O2 --> 2 P2O3
d)

 P4 + O2 --> P4O2

37.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
38.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
39.
In balancing chemical equations, we change
a)
Coefficients
b)
Subscripts
c)
Both can be changed
d)
None can be changed
40.
How many hydrogen atoms are in 2 H2?
a)
1
b)
2
c)
3
d)
4
41.
Which number should go in the blank?
2 Na+ _ Cl2 -> 2 NaCl
a)
1
b)
2
c)
3
d)
0
42.
Which number should go in the blank?
Al(NO3)3 + _  NaOH -> Al(OH)3 + 3 NaNO3
a)
1
b)
2
c)
3
d)
0
43.
How many oxygen atoms are present in the following? 
4Ca(OH)2
a)
4
b)
6
c)
8
d)
1
44.
How many Iron (Fe) atoms are in this chemical formula?
a)
2 iron atoms
b)
6 iron atoms
c)
5 iron atoms
d)
4 iron atoms
45.

What physical state symbol should be included for carbon dioxide?

a)

(s) - solid

b)

(l) - liquid

c)

(g) - gas

d)

(aq) - aqueous

46.

What physical state symbol should be included for oxygen?

a)

(s) - solid

b)

(l) - liquid

c)

(g) - gas

d)

(aq) - aqueous

47.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
48.
How many Mn atoms are found in the following compound?
3Cr(MnO4)6
a)
3
b)
4
c)
6
d)
18
49.

Balance the following equation:

___ SeCl6+ ___ O2→___ SeO2+____Cl2

a)

1, 1, 1, 3

b)

2, 1, 2, 1

c)

1, 2, 1, 2

d)

2, 2, 2, 4

50.
Balance this equation
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
51.

Which equation is balanced?

a)

PbO2 + 2H2

b)

SO2 + H20 --> H2SO4

c)

2Na + 2H2O --> 2NaOH + H2

52.
The following factors affect the position of equilibrium EXCEPT
a)
Concentration
b)
Pressure
c)
Temperature
d)
States of matter
53.

2SO2(g)+O2(g) ⇌ 2SO3(g) + Heat


Increasing the temperature will...

a)

shift equilibrium right

b)

shift equilibrium left

c)

increase pressure

d)

have no change

54.

2SO2(g)+O2(g) ⇌ 2SO3(g) + Heat


Adding SO3(g) will

a)

shift equilibrium right

b)

shift equilibrium left

c)

increase K

d)

have no change

55.

2SO2(g)+1O2(g) ⇌ 2SO3(g) + Heat


Increasing the pressure on the system will...

a)

shift equilibrium right

b)

shift equilibrium left

c)

slow rate of reaction

d)

have no change

56.

CoCI42- +6H2O →Co(H2O)62+ + 4CI-.


What would happen when H2O is added?

a)

Position of equilibrium will shift to left (and become more blue)

b)

Position of equilibrium will shift to right (and become more pink)

c)

Keq will increase as H2O is added

d)

Position of equilibrium will shift to left to reduce the added H2O

57.

1N2 + 3H2 →2NH3


When the pressure on the system is increased, the equilibrium position shifts to the right. Why?

a)

To increase the amount of products

b)

To reduce the pressure, as the right side has fewer molecules of gas

c)

Keq will increase when it is shifted to the right

d)

To increase the pressure, as the right side has more molecules of gas

58.

CoCI42- +6H2O →Co(H2O)62+ + 4CI-


What will happen when CI- ions are added?

a)

Position of equilibrium will shift to left and become more pink

b)

Color of system will turn to all pink

c)

Concentration of reactants and products remain unchanged

d)

Position of equilibrium will shift to left to reduce the added CI- ions

59.

Heat + 1 N2O4 → 2 NO2


What will happen when the temperature is increased?

a)

Position of equilibrium will shift to left and become lighter in color

b)

Position of equilibrium will shift to right and become more brown

c)

No change in position of equilibrium

d)

Position of equilibrium will shift to right and become lighter in color

60.

2CrO42- + 2H+→Cr2O72- + H2O


What will happen when OH- ions are added to the system? HINT: They remove the H+ ions.

a)

Position of equilibrium will shift to right and become more orange

b)

Position of equilibrium will shift to left and become more yellow

c)

Position of equilibrium will shift to right and become more yellow

d)

OH- ions will not react, and thus no change is seen.

61.

2SO2(g)+O2(g) ⇌ 2SO3(g) + Heat


Adding SO2(g) will

a)

shift equilibrium right

b)

shift equilibrium left

c)

increase rate of reaction

d)

have no change

62.

2SO2(g) + O2(g) ⇌ 2SO3(g) + Heat


Removing O2(g) will

a)

shift equilibrium right

b)

shift equilibrium left

c)

increase pressure

d)

have no change

63.

2SO2(g)+1O2(g) ⇌ 2SO3(g) + Heat


Increasing the volume of the container will...

a)

shift equilibrium right

b)

shift equilibrium left

c)

slow rate of reaction

d)

have no change

64.

What happens to the equilibrium if we remove water (H2O)?

a)

It shifts left, towards the reactants

b)

It shifts right, towards the products

c)

It does not shift

65.

What happens to the equilibrium if we add hydrogen (H2)?

a)

It shifts left, towards the reactants

b)

It shifts right, towards the products

c)

It does not shift

66.

What happens when sodium ions (Na+) are added?

a)

The reaction shifts left, towards the reactants

b)

The reaction shifts right, towards the products

c)

There is no shift

67.

What is the effect of increasing concentration of a reactant on equilibrium?

a)

It shifts the equilibrium to the left, favoring the formation of reactants.

b)

It has no effect on the equilibrium position.

c)

It shifts the equilibrium to the right, favoring the formation of products.

d)

It causes the equilibrium to become unstable.

68.

What is the effect of adding a catalyst to a reaction at equilibrium?

a)

It changes the position of equilibrium favoring the products.

b)

It slows down the reaction rate of both forward and reverse reactions.

c)

It speeds up the rate of both the forward and reverse reactions equally, but does not change the position of equilibrium.

d)

It only affects the forward reaction, increasing its rate.

69.

How does increasing temperature affect an exothermic reaction at equilibrium?

a)

Increasing temperature shifts the equilibrium to the right, favoring the products.

b)

Increasing temperature shifts the equilibrium to the left, favoring the reactants.

c)

Increasing temperature has no effect on the equilibrium position.

d)

Increasing temperature increases the rate of the reaction without affecting equilibrium.

70.

What is the effect of adding OH- ions to a reaction that produces H+ ions?

a)

Adding OH- ions will shift the equilibrium to the right, favoring the formation of products, as it removes H+ ions.

b)

Adding OH- ions will shift the equilibrium to the left, favoring the formation of reactants, as it increases H+ ions.

c)

Adding OH- ions will have no effect on the equilibrium position of the reaction.

d)

Adding OH- ions will increase the concentration of H+ ions, thus shifting the equilibrium to the right.

71.

What happens to equilibrium when a product is added?

a)

The position of equilibrium shifts to the left, favoring the formation of reactants.

b)

The position of equilibrium shifts to the right, favoring the formation of products.

c)

The position of equilibrium remains unchanged.

d)

The position of equilibrium shifts to the left, favoring the formation of both reactants and products equally.

72.

What happens to equilibrium when a reactant is added?

a)

The position of equilibrium shifts to the right, favoring the formation of products.

b)

The position of equilibrium shifts to the left, favoring the formation of reactants.

c)

The position of equilibrium remains unchanged.

d)

The position of equilibrium shifts to the right, but does not favor any side.

73.

What is the effect of decreasing concentration of a product on equilibrium?

a)

It shifts the equilibrium to the left, favoring the formation of reactants.

b)

It has no effect on the equilibrium position.

c)

It shifts the equilibrium to the right, favoring the formation of products.

d)

It causes the equilibrium to become static.

74.

What happens to the equilibrium if we add methane (CH4)?

a)

It shifts left, towards the reactants

b)

It shifts right, towards the products

c)

It does not shift

75.

What happens to the equilibrium if we remove heat?

a)

It shifts left, towards the reactants

b)

It shifts right, towards the products

c)

It does not shift

76.

What happens to the equilibrium if we remove carbon monoxide (CO)?

a)

It shifts left, towards the reactants

b)

It shifts right, towards the products

c)

It does not shift

77.

Which of the following statements is false about a system in equilibrium?

a)

The concentration of reactants and products may differ

b)

The rates of the forward and reverse reactions may differ

c)

The rates of the forward and reverse reactions must be equivalent

78.
What is the molar mass of C6H12O6?
a)

180.18 g/mol

b)

180.12 g/mol

c)

180.24 g/mol

d)

180.06 g/mol

79.
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
80.
N2 +  3H2 → 2NH3 
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
a)

6 mol H

b)

2 mol H

c)

3 mol H

d)

1 mol H

81.
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
82.
2 NaClO3 (s) --> 2NaCl (s) +3 O2 (g)  
12.00 moles of NaClO3 will produce how many grams of O2?
a)
256 g of O2
b)
576 g of O2
c)
288 g O2
83.
B2H6 + 3O2 -->2 HBO2 + 2 H2O
 What mass of O2 will be needed to burn 36.1 g of B2H6?
a)
13.8 g O2
b)
3.86 mol of O2
c)
124 g O2
84.
4 Al + 3 O2 –> 2 Al2O3  How much aluminum would be needed to completely react with 45 grams of O2?
a)
1.05 moles
b)
3.75 moles
c)
1.875 grams
d)
1.875 moles
85.
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
How many grams of aluminum sulfate would be formed if 250g H2SO4 completely reacted with aluminum?
a)
0.85 g
b)
290 g
c)
450 g
d)
870 g
86.
 CaC₂(s) + 2H₂O(l)   -->   C₂H₂(g)   + Ca(OH)₂(aq)
how many grams of Ca(OH)₂ would be formed with 3.20 moles of CaC₂?
a)
119 g
b)
21.2 g
c)
114 g
d)
237 g
87.
Using the following equation:
4NH3(g) + 5O2(g) --> 4NO(g) + 6H2O(l)
How many grams of oxygen gas are needed to react with 56.8 grams of ammonia?
a)
45.08 g O2
b)
133.33 g O2
c)
260.77 g O2
d)
75.92 g O2
88.
2Na + 2H2O → 2NaOH+ H2
How many grams of hydrogen are produced if 120 g of Na are available?
a)
5.2 g
b)
2.6 g
c)
690 g
d)
45 g
89.
 SiO2 + 3C → SiC + 2CO
I need to add 8 moles of Carbon to the reaction. How many grams of Carbon should I weigh?
a)
96 g
b)
0.67 g
c)
2.67 g
d)
48 g
90.
Cl2 + 2 KBr → Br2 + 2 KCl
How many grams of potassium chloride can be produced from 356 g of chlorine and 356 g of potassium bromide?
a)
749 g
b)
223 g
c)
479 g
d)
814 g
91.
CH4 + 2 O2 → CO2 + 2 H2O
How many moles of carbon dioxide are produced from the combustion of 110 g of CH4?
a)
13.7 mol
b)
2.75 mol
c)
6.11 mol
d)
6.85 mol
92.
Fe (s) + S (l) --> FeS (s)  

In the experiment above, 7.62 g of Fe are allowed to react with 8.67 g of S.
How much FeS is formed?
a)
14.8 g
b)
12.2 g
c)
13.7 g
d)
19.9 g

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