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Chemical Reactions Test Review

Total questions: 39

Worksheet time: 55mins

Name
Class
Date
1.

What do all chemical changes have in common?

a)

Energy is absorbed and it feels cold.

b)

Energy is released and it feels hot.

c)

Gas bubbles are produced.

d)

New substances form.

2.

Which of the columns below shows only chemical changes?

a)

Column A

b)

Column B

c)

Column C

d)

Column D

3.

A student has two clear liquids, Liquid A and Liquid B. One beaker is filled with Liquid A and Liquid B is added drop by drop. The student recorded the data shown in the table below. What conclusion can be drawn from her observations?

a)

A precipitate formed

b)

Temperature increased

c)

Color changed

d)

Mass increased

4.
The chemical formula for sodium sulfate is Na2SO4. How many sulfur atoms are in the formula for sodium sulfate?
a)
1
b)
2
c)
6
d)
7
5.
NaOH + HCl --> NaCl + H2O Identify the reactants in the chemical equation above.
a)
NaOH and HCl
b)
NaCl and H2O
c)
HCl and H2O
d)
HCl and NaCl
6.

The Law of Conservation of Mass states

a)

that matter exists in all states and reacts the same

b)

that matter can only be changed into new substances by introducing a catalyst

c)

that matter exists in the same state throughout any chemical change

d)

that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

7.

2AgNO3 + CaCl2 --> 2AgCl + Ca(NO3)2

Identify the products in the chemical equation above.

a)
2AgNO3 and CaCl2
b)
2AgCl and Ca(NO3)2
c)
CaCl2 and Ca
d)
Ag, Cl, N, and Ca
8.

Reactants

a)

A starting material in a chemical reaction

b)

the material you have at the end of the experiment

c)

a substance that forms in a chemical reaction

9.

products

a)

a substance that is formed or produced in a chemical reaction

b)

A starting material in a chemical reaction. It's what goes into the equation or experiment

c)

A change in matter that produces one or more new substances

10.
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.
11.

Which equation is balanced?

a)

Na + O2 -> Na2O

b)

2Na2 + O2 -> 2Na2O

c)

2Na + 2O2 -> 2Na2O

d)

4Na + O2 -> 2Na2O

12.

According to the law of conservation of mass, how should the mass of the products compare to the mass of the reactants in a chemical equation?

a)

do not compare

b)

Mass of products greater

c)

mass of reactants greater

d)

masses are always equal

13.

What type of reaction is 2H2O -> 2H2 + O2?

a)

decomposition

b)

double-displacement

c)

single-displacement

d)

synthesis

14.

To balance the following chemical equation, what do you need to put in front of NH3?

N2 + 3H2 -> _____ NH3

a)

1

b)

2

c)

3

d)

6

15.

What type of reaction is shown in the following chemical equation: NH3 + HCl -> NH4Cl

a)

decomposition

b)

double replacement

c)

single replacement

d)

synthesis

16.

Which coefficient must go in the missing spot to balance the chemical equation?


___Cu + O2 --> 2Cu2O

a)

4

b)

1

c)

5

d)

3

17.

What type of reaction is below?

Cu2O + K --> K2O + Cu

a)

Synthesis

b)

Decomposition

c)

Double Replacement

d)

Combustion

e)

Single Replacement

18.

What type of reaction is below?

H2O --> H2 + O2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

19.

What type of reaction is below?

Mg(NO3)2 + Na2O --> NaNO3 + MgO

a)

Combination/Synthesis

b)

Single Replacement

c)

Double Replacement

d)

Combustion

20.

How many grams of Mg were reacted?

a)

0 g

b)

15 g

c)

30 g

d)

45 g

21.

I reacted 40g of vinegar with 20g of baking soda in an open beaker. At the end of the reaction there were only 55g of product. What happened to the other 5 grams?

a)

The were destroyed

b)

They weren't ever created

c)

They escaped the closed system as a gas

d)

They escaped the open system as a gas

22.

What kind of system was used in this experiment?

a)

Open System

b)

Dewey Decimal System

c)

Closed System

d)

Lid System

23.

How many grams of Al were reacted?

a)

0 g

b)

15 g

c)

25 g

d)

40 g

24.

What type of reaction is shown?

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

25.

What type of system is BEST to demonstrate the Law of Conservation of Mass?

a)

Open System

b)

Dewey Decimal System

c)

Closed System

d)

Lid System

26.

What type of reaction is shown?

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

27.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
28.
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
29.
Balance this equation-
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
30.
Classify
FeS + HCl → H2S + FeCl2
a)
synthesis
b)
combustion
c)
single replacement
d)
double replacement
31.

4Si + S8 --> 2Si2S4

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

32.
If a reaction starts with a total 75g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 75g of products
c)
a total of 180 g of products
d)
None of the above
33.

In an endothermic reaction, energy is _________.

a)

absorbed

b)

released

34.

____ reactions usually feel cold.

a)

endothermic

b)

exothermic

35.

_____ reactions usually feel hot!

a)

endothermic

b)

exothermic

36.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
37.

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

a)

The reaction is exothermic

b)

The reaction is endothermic

38.

Meals-ready-to-eat (MREs) are packaged meals that include their own disposable heat pack to warm the food. Students are challenged to duplicate MREs in the science classroom using chemical reactions. The final product must be safe and light. Based on the observations, which chemical reaction would be the best choice for making a heat pack?

a)

1

b)

2

c)

3

d)

4

39.

Exothermic reactions release energy. Where is the energy used for these reactions stored?

a)

In the chemical bonds

b)

In the atmosphere

c)

In the electrons

d)

In the nucleus of an atom

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