Free Printable Unit Review: Chemical Reactions

1.

Na₃PO₄+ (a) KOH → (b) NaOH + K₃PO₄

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2

1

3

2.

MgF₂ + Li₂CO₃ → MgCO₃ + (a) LiF

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2

1

3

3.

P₄ + (a) O₄ → (b) P₂O₃

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1

3

2

4.

(a) RbNO₃ + BeF₂ → Be(NO₃)₂ + (b) RbF

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2

1

3

5.

(a) AgNO₃ + Cu → Cu(NO₃)₂ + (b) Ag

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2

1

3

6.

CF₄ + (a) Br₂→ CBr₄ + (b) F₂

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2

1

3

7.

(a) HCN + CuSO₄→ H₂SO₄ + Cu(CN)₂

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2

1

3

8.

GaF₃ + (a) Cs→ (b) CsF + Ga

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1

2

3

9.

N₂ + (a) F₂→ (b) NF₃

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2

1

3

10.

(a) NaF + Br₂ → (b) NaBr + F₂

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2

1

3

11.

Pb(OH)₂+ (a) HCl → (b) H₂O + PbCl₂

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2

1

3

12.

(a) AlBr₃+ (b) K₂SO₄→ (c) KBr + Al₂(SO₄)₃

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2

1

3

6

13.

CH₄+ (a) O₂→ CO₂ + (b) H₂O

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1

2

3

14.

(a) Na₃PO₄+ (b) CaCl₂→ (c) NaCl + Ca₃(PO₄)₂

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2

1

3

6

15.

(a) K+ Cl₂→ (b) KCl

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1

2

3

16.

(a) Al+ (b) HCl→ (c) H₂ + (d) AlCl₃

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1

2

3

6

17.

N₂ + (a) H₂→ (b) NH₃

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2

1

3

18.

SO₂+ (a) Li₂Se→ SSe₂ + (b) Li₂O

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1

2

3

19.

(a) NH₃+ H₂SO₄→ (NH₄)₂SO₄

Choose from the below words

1

2

3

20.

The following is what type of reaction: PbCl₂ + 2AgNO₃ → Pb(NO₃)₂ + 2AgCl

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

21.

The following is what type of reaction:
NH₃ + HCl → NH₄Cl

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

22.

What is decomposition?

a)

putting substances together

b)

breaking substances apart

c)

element displacing another element in a compound

d)

burning of a substance

23.

What type of chemical reaction is this? 2Al(OH)₃ → Al₂O₃ + 3H₂O

a)

Decomposition

b)

Combustion

c)

Synthesis

d)

Single Replacement

e)

Double Replacement

24.

Ions in two compounds switch.

a)

Synthesis

b)

Combustion

c)

Single Replacement

d)

Double Replacement

e)

Decomposition

25.

3Ca + 2AlCl₃ --> 3CaCl₂+2Al

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

26.

One element replaces another in a compound.

a)

Synthesis

b)

Combustion

c)

Single Replacement

d)

Double Replacement

e)

Decomposition

27.

Two Reactants and One Product

a)

Decomposition

b)

Synthesis

c)

Combustion

d)

Single Replacement

e)

Double Replacement

28.

What type of reaction is taking place in this picture?

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

29.

4Si + S₈ --> 2Si₂S₄

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

30.

3KOH + H₃PO₄ --> K₃PO₄+3H₂O

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

31.

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

32.

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

33.

What reaction has the following general formula:

A + B --> AB

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

34.

What reaction has the following general formula:

AB + CD --> CB + AD

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

35.

What reaction has the following general formula:

A + CD --> C + AD

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

36.

a)

Synthesis

b)

Combustion

c)

Decomposition

d)

Single Replacement

e)

Double Replacement

37.

C₄H₁₂ + 7O₂ → 4CO₂ + 6H₂O

a)

Synthesis

b)

Combustion

c)

Single Replacement

d)

Double Replacement

e)

Decomposition

38.

3KOH + H₃PO₄ --> K₃PO₄+ 3H₂O

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

39.

What type of reaction involves one element replacing another element in a compound?

a)

Single Replacement

b)

Double Replacement

c)

Synthesis

d)

Decomposition

e)

Combustion

40.

How many Hydrogen atoms are in 4 H₂O? (a) How many oxygen atoms? (b)

Choose from the below words

8

4

1

2

3

5

6

7

9

41.

How many O's are in Al₂(SO₄)₃

(a)

42.

3(NH₄)₂CrO₄

Number of N: (a)

Number of H: (b)

Number of Cr: (c)

Number of O: (d)

Choose from the below words

6

24

3

12

4

8

1

2

9

43.

How many elements are in 2 C₆H₁₂O₇? (a)

How many C: (b)

How many H: (c)

How many O: (d)

How many TOTAL atoms: (e)

Choose from the below words

3

12

24

14

50

7

6

25

52

60

44.

2 CH₂CO₃OH

Number of C: (a)

Number of H: (b)

Number of O: (c)

Choose from the below words

4

6

8

2

3

1

5

7

9

10

45.

How many Sulfur's are in Al₂(SO₄)₃

a)

4

b)

3

c)

7

d)

12

46.

How many Nitrogen atoms are in the in H₃C₂ON₅?

a)

2

b)

3

c)

4

d)

5

47.

How many atoms of Oxygen are in Fe(NO₃)₃ ?

a)

6

b)

3

c)

9

d)

1

48.

Match the element to the number of atoms it has.

2 Al(C₂H₃O₄)₂

a)

aluminum

1.

2

b)

carbon

2.

8

c)

hydrogen

3.

12

d)

oxygen

4.

16

49.

What does the subscript in a chemical formula tell you?

a)

How many molecules are present

b)

How many atoms are present

c)

How many elements are present

d)

How many neutrons are present

50.

What elements are represented in this chemical formula? $Fe_2O_3$

a)

Iron, Oxygen

b)

Francium, Europium, Oxygen

c)

Ferrium, Oxygen

d)

Berylium, Oxygen

51.

How many more atoms of Oxygen than than Magnesium are in this formula? (subtraction) $MgSO_4$

a)

4

b)

3

c)

2

d)

6

52.

Match the formula to the description:

a)

SO₃

1.

1 sulfur, 3 oxygen's

b)

2 SO₃

2.

2 sulfur's, 6 oxygen's

c)

2 S₂O₃

3.

4 sulfur's, 6 oxygen's

d)

3 SO₄

4.

3 sulfur's, 12 oxygen's

e)

SO₄

5.

1 sulfur, 4 oxygen's

53.

Which element has the greatest number of atoms? $AgNO_3$

a)

Silver

b)

Gold

c)

Nitrogen

d)

Oxygen

54.

The ______ are numbers found on the lower right-hand side of an element symbol.

a)

Coefficient

b)

Exponent

c)

Multiplier

d)

Subscript

55.

Coefficients in chemical formulas...

a)

are found at the beginning of a formula and multiply just the first atom

b)

are found at the end of a formula and multiply EVERYTHING!

c)

are found at the end of a formula and multiply only elements inside the parentheses.

d)

are found at the beginning of a formula and multiply EVERYTHING!

56.

4CF₂Cl₃

a)

carbon

1.

4

b)

fluorine

2.

8

c)

chlorine

3.

12

57.

Put the elements in order from smallest to largest number of atoms:

2 C₃H₅(NO₃)₄

a)

carbon

b)

nitrogen

c)

hydrogen

d)

oxygen

1)

2)

3)

4)

58.

3 H₂SO₄

There are (a) hydrogens, (b) sulfurs, and (c) oxygens

Choose from the below words

6

3

12

2

4

1

59.

A ______ is a number written in front of a chemical formula.

a)

Coefficient

b)

Subscript

c)

Exponent

d)

Coordinator

60.

What is collision theory?

a)

Molecules must collide in the correct orientation with enough energy to bond.

b)

Molecules need enough energy to collide and react.

c)

Atoms constantly collide and react.

d)

The minimum energy needed for atoms to react

61.

Which PE Diagram represents an endothermic reaction?

a)

A

b)

B

62.

Which PE Diagram represents an exothermic reaction?

a)

A

b)

B

63.

What is the rate of reaction?

a)

How much energy is needed for a reaction to occur.

b)

The energy required to break a bond.

c)

The time it takes for a reaction to occur.

d)

Collision Theory

64.

What is the purpose of a catalyst?

a)

Helps to slow down a reaction

b)

Raises the activation energy

c)

Lowers the activation energy

d)

Is consumed by the reaction

65.

What factors effect rate of reaction?

a)

Temperature, Concentration, Pressure and Energy

b)

Surface Area, Concentration, Energy and Pressure

c)

Temperature, Pressure, Concentration and Surface area

d)

Pressure, Surface area, Density and Energy

66.

Would the reaction rate speed up or slow down: A tablespoon of powdered sugar placed into HCL.

a)

Slow down

b)

Speed up

c)

Stays the same

67.

Increasing the temperature of your solution will.......

a)

Not affect the rate of reaction.

b)

Speed up the rate of reaction

c)

Slow down the rate of reaction

68.

Decreasing the concentration of a substance will usually........

a)

Slow down the reaction

b)

Speed up the reaction

c)

Have no affect on the reaction

69.

Which has more surface area?

a)

Large chunks of chalk

b)

Cube of sugar

c)

Powdered sugar

d)

Small chunks of sugar

70.

If you shrink the container size that your gas substance is in what will happen?

a)

The reaction rate will stay the same

b)

The reaction rate will speed up

c)

The reaction rate will slow down

71.

If the reactant particles collide with less than the activation energy, the particles will be rebound, and no reaction will occur.

a)

True

b)

False

72.

With the increase in temperature, the average kinetic energy of the molecules increases, leading to a decrease in number of collisions per unit time.

a)

True

b)

False

73.

The collisions which bring about a chemical reaction are called:

a)

Consistent collisions

b)

Normal collisions

c)

Effective collisions

d)

None of the above

74.

More collisions correspond to a:

a)

Faster reaction rate

b)

Slower reaction rate

c)

Constant reaction rate

d)

None of the above

75.

What criteria must be met for reactant collisions to result in a successful product?

a)

The reactants must collide with each other

b)

The reactants must collide with enough energy and be in the right positions

c)

The reactants must have enough energy to form the activated complex

Unit Review: Chemical Reactions

Total questions: 75

Worksheet time: 2hrs 42mins

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