Free Printable Unit 3 Review

1.

How many oxygen atoms are in $2\ CaCO_3$

a)

1

b)

2

c)

3

d)

6

2.

How many hydrogen atoms are in $\left(NH_4\right)_2Cr_2O_7$

a)

1

b)

2

c)

4

d)

8

3.

How many nitrogen atoms are in $NH_4NO_3$

a)

1

b)

2

c)

3

d)

4

4.

How many oxygen atoms are in $3\ Al_2\left(SO_4\right)_3$

a)

3

b)

4

c)

12

d)

36

5.

$5\ Be_3\left(BO_3\right)_2$

a)

3

b)

5

c)

15

d)

30

6.

What type of reaction is exothermic and always make carbon dioxide $\left(CO_2\right)$ and water vapor ( $H_2O$ ) as products?

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

7.

What type of reaction occurs when two or more elements or compounds combine to make one more complex product?

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

8.

What type of reaction involves the breaking down of a complex reactant into two or more simpler susbtances?

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

9.

What type of reaction occurs when two similar elements or parts of compounds swap places with each other, creating two new products?

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

10.

What type of reaction requires an input of energy from the environment to occur?

a)

Endothermic

b)

Exothermic

11.

What type of reaction is:
$Au_2O_3\ \left(s\right)\ \rightarrow\ Au\ \left(s\right)\ +\ O_2\ \left(g\right)$

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

12.

What type of reaction is:
$AlCl_3\ \left(aq\right)\ +\ Ca\ \left(s\right)\ \rightarrow\ Al\ \left(s\right)\ +\ CaCl_2\ \left(aq\right)$

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

13.

What type of reaction is:
$Li_2O\ \left(s\right)\ +\ H_2O\ \left(l\right)\ \rightarrow\ LiOH\ \left(aq\right)$

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

14.

What type of reaction is:
$C_6H_{12}O_6\ \left(s\right)+\ 6\ O_2\ \left(g\right)\rightarrow\ 6\ CO_2\ \left(g\right)\ +\ 6\ H_2O\ \left(l\right)$

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

15.

What type of reaction is:
$H_2SO_4\ \left(aq\right)\ +\ NaOH\ \left(aq\right)\ \rightarrow\ H_2O\ \left(l\right)\ +\ Na_2SO_4\ \left(aq\right)$

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

16.

Is the following equation balanced or unbalanced? $Zn\ \left(s\right)\ +\ 2\ HCl\ \left(aq\right)\rightarrow\ ZnCl_2\ \left(aq\right)\ +\ H_2\ \left(g\right)$

a)

Balanced

b)

Unbalanced

17.

Is the following equation balanced or unbalanced? $2\ Au_2O_3\ \left(s\right)\ \rightarrow\ Au\ \left(s\right)\ +\ 3\ O_2\ \left(g\right)$

a)

Balanced

b)

Unbalanced

18.

Is the following equation balanced or unbalanced? $CrCl_6\ \left(aq\right)\ +3\ Mg\ \left(s\right)\ \rightarrow\ Cr\ \left(s\right)\ +\ 3\ MgCl_2\ \left(aq\right)\$

a)

Balanced

b)

Unbalanced

19.

Is the following equation balanced or unbalanced? $2\ H_3PO_4\ \left(aq\right)\ +\ 3\ Ca\left(OH\right)_2\ \left(s\right)\ \rightarrow\ Ca_3\left(PO_4\right)_2\ \left(aq\right)\ +\ H_2O\ \left(l\right)$

a)

Balanced

b)

Unbalanced

20.

Is the following equation balanced or unbalanced? $2\ C_3H_6\ \left(g\right)\ +\ 9\ O_2\ \rightarrow\ 6\ CO_2\ \left(g\right)\ +\ 6\ H_2O\ \left(g\right)$

a)

Balanced

b)

Unbalanced

21.

What is the term for any substance or condition written above a reaction arrow that speeds the reaction.

a)

Endothermic

b)

Product

c)

Catalyst

d)

Reactant

22.

Law that says matter or energy cannot be created or destroyed in a typical chemical reaction, but it can be transferred or transformed.

a)

Law of Conservation

b)

First Law of Motion

c)

Ideal Gas Law

d)

First Law of Thermodynamics

23.

What is the term and symbol for a substance that is dissolved in water?

a)

Solid (s)

b)

Liquid (l)

c)

Gas (g)

d)

Aqueous (aq)

24.

What is the term for substances on the right side of the arrow?

a)

Reactants

b)

Products

c)

Catalysts

d)

Reagents

25.

What symbol indicates that a reaction is reversible?

a)

Double-sided arrow

b)

Substance over the arrow

c)

Forwards arrow

d)

Backwards arrow

26.

The Hellenistic Era was...

a)

Initiated by the Spartans defeat of Athens in Peloponnesian War

b)

marked by a spread of Greek culture into the lands of the Persian Empire

c)

the of the Roman Empire's greatest expansion

d)

the decade following Rome's conquest of Carthage

27.

4Si + S₈ --> 2Si₂S₄

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Double displacement

28.

3Ca + 2AlCl₃ --> 3CaCl₂+2Al

a)

Synthesis

b)

Decomposition

c)

Single diplacement

d)

Double displacement

29.

2Pb(NO₃)₂ --> 2PbO + 4NO₂ + O₂

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Combustion

30.

2NO₂ --> N₂+ 2O₂

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Combustion

31.

Fe + H₂SO₄ --> Fe₂(SO₄)₃ + H₂

a)

Synthesis (combination)

b)

Decomposition

c)

Single replacement

d)

Combustion

32.

Which reaction type is the following: C₅H₁₀O₄ + O₂ --> CO₂ + H₂O

a)

Decomposition

b)

Single Replacement

c)

Combustion

d)

Double Replacement

33.

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

34.

What coefficient should be used to make the following equation balanced?
N₂+O₂--> _NO

a)

1

b)

2

c)

3

d)

4

35.

Balance this equation:
__Li + __Cl₂ -> __LiCl

a)

2Li + Cl₂ -> 4LiCl₂

b)

2Li + Cl₂ -> LiCl₂

c)

2Li + Cl₂ -> 2LiCl

36.

PbCl₂ + AgNO₃ ---> Pb(NO₃)₂ + AgCl

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

37.

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

38.

What term is given to a reaction which transfers heat energy to the surroundings?

a)

Endothermic

b)

Reversible

c)

Exothermic

d)

Exotermic

39.

When barium hydroxide and ammonium chloride react, the temperature of the mixture decreases. What kind of reaction is this?

a)

Endothermic

b)

Decomposition

c)

Exothermic

d)

Indothermic

40.

When calcium reacts with water, the temperature changes from 18°C to 39°C. Which statement is correct?

a)

The solution at the end is acidic

b)

The reaction is reversible

c)

The reaction is exothermic

d)

The reaction is endothermic

41.

Grinding a seltzer tablet into powder increases the rate of reaction due to increased

a)

concentration

b)

surface area

c)

temperature

d)

reactants

42.

Products will form faster if____________

a)

the particle size of the reactants are larger.

b)

temperature is decreased.

c)

concentration of the reactants are increased.

d)

the reaction is not stirred.

43.

In a chemical reaction, how quickly or slowly reactants turn

into products is called the

a)

Catalyst

b)

Reaction Rate

c)

Concentration

d)

Temperature

44.

A ______________ is a substance that increases the rate of a reaction without being used up during the reaction.

a)

catalyst

b)

product

c)

reactant

d)

solute

45.

More collisions correspond to a:

a)

Faster reaction rate

b)

Slower reaction rate

c)

Constant reaction rate

Unit 3 Review

Total questions: 45

Worksheet time: 38mins

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