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Unit 5 Chemical Reactions Review

Total questions: 65

Worksheet time: 3hrs 1mins

Name
Class
Date
1.
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
2.

What type of reactions is this:

C3H8 + O2 --> H2O + CO2

a)

Synthesis (combination)

b)

Decomposition

c)

Single replacement

d)

Combustion

3.
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
4.

Which examples have signs of a physical change?

a)

1,4,5

b)

2,3,6

c)

1,2,6

d)

2,4,6

5.

Due to the Law of Conservation of Matter, will FeS be equal, less, or more than Fe + S?

a)

less

b)

more

c)

equal

6.

What happens to the properties during a chemical change?

a)

The properties stay the same.

b)

The properties change.

7.

What happens in ALL chemical changes?

a)

Change in state of matter

b)

A new substance is formed

c)

Bubbles are produced

d)

An explosion

8.

The Law of Conservation of Mass tells us matter can't ______________.

a)

change color

b)

change state of matter

c)

be created or destroyed

d)

change temperature

9.

Which is a Chemical property?

a)

Thermal Conductivity

b)

Density

c)

Malleability

d)

Flammability

10.

Which of the following is a chemical property of water?

a)

Reacts with pure sodium.

b)

Boils at 100 oC.

c)

Dissolves sugar easily.

d)

Has a density of 1 gm/mL

11.

Which property is on the wrong side?

a)

Density

b)

Melting Point

c)

Reactivity

d)

Solubility

12.

Which is a physical change?

a)

1

b)

2

c)

3

d)

4

e)

5

13.

In this equation 2NaF + Br2 →2NaBr +F2

The underlined part represents...

a)

Products

b)

Reactants

c)

Energy

14.

What reaction has the following general formula:

AB --> A + B

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

15.

What reaction has the following general formula:

A + CD --> C + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

16.
Predict the products for the this reaction:
K + HCl --> 
a)
KCl + H2
b)
KHCl 
c)
KH + Cl2
d)
KCl + H
17.
What kind of reaction is this:
Fe + CuSO4 -> Cu + FeSO4
a)
Double Replacement
b)
Decompostion
c)
Single Replacement
d)
Combustion
18.
Which of the following are PRODUCTS?
H2O + CO2 → HCO + HO
a)
H2O and CO2
b)
HCO and HO
c)
H2O ONLY
d)
HCO ONLY
19.

What are the predicted products of this reaction? Copper (II) is the form used in this reaction.


Cu+ AgNO3-->

a)

Cu(NO3)2+Ag

b)

CuNO3 + Ag

c)

CuAg+NO3

d)

Cu+ AgNO3

20.
__Al + __Fe3N2 -->__AlN + __Fe
a)
already balanced
b)
4,2,4,6
c)
2,1,2,3
d)
1,2,1,3
21.
__Na + __Cl2 --> __NaCl
a)
1,1,2
b)
2,1,2
c)
2,1,1
d)
already balanced
22.
__(NH4)3PO4 + __Pb(NO3)4 --> __Pb3(PO4)4 + __NH4NO3
a)
2,1,1,6
b)
1,2,2,3
c)
4,3,1,12
d)
4,2,1,12
23.
_BaS + _PtF2 → _BaF2 + _PtS
a)
1 BaS + 1 PtF2 → 1 BaF2 + 1 PtS
b)
4 BaS + 2 PtF2 → 1 BaF2 +  1 PtS
c)
1 BaS + 2 PtF2→ 2 BaF2 +  2 PtS
d)
1 BaS + 3 PtF2 →1 BaF2 +  2 PtS
24.

How many grams of Mg were reacted?

a)

0 g

b)

15 g

c)

30 g

d)

45 g

25.

What type of reaction is shown?

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

26.
A teacher is demonstrating physical and chemical changes to her class. Which action should she use to demonstrate a chemical change?
a)
cutting a piece of paper
b)
folding a piece of paper
c)
tearing a piece of paper
d)
burning a piece of paper
27.
How many Aluminum are in Al2O3?
a)
3
b)
2
c)
5
28.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
29.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
30.
What is the number before a chemical formula called?
Ex: 2H2 + O2 --> 2H2O
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
31.

4. A(n) _____________ is a characteristic of matter that can be observed as it changes to a different type of matter.

a)

A. chemical change

b)

B. chemical property

c)

C. chemical equation

d)

D. energy change

32.

Which of the following shows signs of a chemical reaction?

a)

a colorless liquid and a gray solid are mixed to produce a gas and a green liquid.

b)

liquid water is boiled to produce steam.

c)

large brown rocks are ground into smaller pieces to produce a brown powder.

d)

water is added to a dark blue liquid to produce a light blue liquid.

33.

A student pours two different liquids into a glass beaker. Which of the following would indicate that a chemical reaction occurred between the two liquids?

a)

an increase in total mass of the liquids.

b)

a decrease in total volume of the liquids.

c)

the formation of a solid in the beaker.

d)

the complete mixing of the two liquids.

34.

Which of the following demonstrates conservation of atoms?

a)
b)
c)
d)
35.

Which of the following statements is correct?

a)

In a chemical reaction, the total mass of the products is more than the total mass of the reactants.

b)

In a chemical reaction, the total mass of the products is less than the total mass of the reactants.

c)

In a chemical reaction, the total mass of the products is equal to the total mass of the reactants.

d)

In a chemical reaction, the total mass of the products is unrelated to the total mass of the reactants.

36.
Which of the following models best demonstrates a balanced chemical equation?
a)
F
b)
G
c)
H
d)
J
37.
What is decomposition?
a)
putting substances together
b)
breaking substances apart
c)
element replacing another element in a compoud
d)
burning of a subtance
38.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
39.
Is this balanced?...
Fe + S --> FeS
a)
YES!
b)
NO!
40.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
41.
What is the evidence of the chemical change seen here?
a)
Color change
b)
Light produced
c)
state change
d)
mixture
42.
When two substances are mixed, they might form a new substance.  Which of the following would indicate that a new substance has been formed?
a)
The temperature of the mixture decreases.
b)
The volume of the mixture increases.
c)
The mass of the mixture increases.
d)
One of the substances dissolves.
43.
All of the following are evidence of a chemical change EXCEPT-
a)
change in state of matter
b)
formation of a gas
c)
color change
d)
precipitate forms
44.
A student mixes two clear liquids together. After a few minutes, a white powdery solid can be seen settling on the bottom of the test tube. Which of the following is a conclusion that the student can draw based on these observations? The two clear liquids –
a)
were pure substances before they were mixed.
b)
are toxic and should be handled with extreme caution.
c)
have gone through a chemical change in which a new substance called a precipitate was produced.
d)
have been stored too long and are no longer good.
45.

Which of the following is an example of a precipitate?

a)

liquid evaporating into gas

b)

a solid formed from a frozen liquid

c)

a chunky solid formed from two liquids combining

d)

a liquid solution that contains two substances

46.
A group of students investigated physical and chemical changes using paper.  The students recorded their observations in a table.
Which student correctly recorded all the changes that took place?
a)
Student 1
b)
Student 2
c)
Student 3
d)
Student 4
47.
A scientist performed four investigations using eight different liquids. In each investigation, the scientist combined two of the liquids under a fume hood and recorded observations in the table below.In which investigation is it least likely that the liquids reacted chemically?
a)
1
b)
2
c)
3
d)
4
48.

The table below describes two experiments.

a)

Experiment 1 shows a physical change because no new substances were produced, and experiment 2 shows a chemical change because a new substance was produced.

b)

Experiment 1 shows a chemical change because bubbles were produced, and experiment 2 shows a physical change because a liquid turned into a solid.

c)

Experiments 1 and 2 show chemical changes because bubbles were produced.

d)

Experiments 1 and 2 show physical changes because no new substances were produced.

49.
Which of the following is an example that includes evidence of a chemical reaction?
a)
A sample of zinc is placed in water and it settles to the bottom
b)
A solid block of ice is heated and it completely melts into a liquid. 
c)
Sugar that is burned gives off an odor and turns brown and then black.
d)
A tomato is placed into a blender and chopped up into smaller pieces.
50.

What is the difference between a chemical change and a physical change?

a)

A physical change creates a new substance, a chemical change does not.

b)

A chemical change creates a new substance, a physical change does not.

c)

A chemical change makes the substance look different but a physical change does not.

d)

A physical change makes the substance change color where a chemical change does not.

51.

If 20g of sugar is stirred into a beaker containing 100g of water. What would the mass of the dissolved solution be after the sugar is dissolved fully?

a)

20g

b)

100g

c)

80g

d)

120g

52.
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
53.

How many oxygen atoms are in this chemical formula?

a)

6 oxygen atoms

b)

2 oxygen atoms

c)

3 oxygen atoms

d)

4 oxygen atoms

54.
In a synthesis reaction
a)
A compound breaks apart into two or more compounds
b)
Two or more compounds make one single product
c)
CO2 and H2O must be products
d)
O2 must be a reactant
55.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
56.
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
57.

Which of the following changes is a physical change of matter?

a)

water evaporating

b)

paper burning

c)

a nail rusting

d)

a silver spoon tarnishing

58.
Predict the products for the this reaction:
Mg + CuCl2 --> 
a)
MgCl2 + Cu
b)
MgCl + Cu
c)
MgCu + Cl2
d)
CuMg + Cl2
59.
KBr + Cl₂ →
a)
KCl + Br₂
b)
KCl + Br
60.
PbSO₄ + AgNO₃ →
a)
Ag₂SO₄ + Pb(NO₃)₂
b)
Ag₂SO+ Pb(NO₃)
61.
What are oxidation numbers?
a)
Number of electrons in the outer most energy level
b)
Number of protons
c)
Electrons gained or lost in chemical bonding
d)
Number of neutrons gained or lost
62.

What is oxidation number of P?

a)
+1
b)
+5
c)

-3

d)
0
63.

What is the oxidation number of S  ?

a)
-2
b)
+2
c)
+6
d)
-4
64.

What is the oxidation number of Ca?

a)
+3
b)
+2
c)
-3
d)
-2
65.

What is oxidation number of Manganese (II)  ?

a)
0
b)
+2
c)
-2
d)
+4

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