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Chemical Reaction Unit Test Practice

Total questions: 52

Worksheet time: 23mins

Name
Class
Date
1.

Bases have many uses. They are mainly used to make

a)

cleaning products

b)

soaps

c)

fertilizer

d)

all of the answer choices

2.

If the substance is neutral, what would the pH be?

a)

3

b)

5

c)

7

d)

9

e)

11

3.
The pH scale is a range from:
a)

1-7

b)

0-14

c)

1-14

d)

1-20

4.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
5.
According to the pH range which substance is more acidic than lemon juice
a)

Hydrochloric acid

b)

cabbage

c)

milk

6.
Which of the following word pairs correctly completes the sentence below?
_______ are corrosive substances characterized as having a strong smell, a sour taste, and a _______.
a)

Acids; pH less than 7

b)

Acids; pH greater than 7

c)

Bases; pH greater than 7

d)

Bases; pH less than 7

7.

Which of the following is the strongest base?

a)

oven cleaner - 13.5

b)

lemon juice - 2.5

c)

soap - 10

d)

blood - 7.4

8.
Which of the following is true about acids and bases?
a)

The lower the pH, the stronger the acid

b)

the higher the pH, the stronger the acid

c)

The lower the pH, the more neutral the acid

d)

The higher the pH, the weaker the base

9.

Which of the following is a property of a base?

a)

sticky feel

b)

slippery feel

c)

reacts with metals

d)

sour taste

10.

Which of the following is a property of an acid?

a)

slippery feel

b)

bitter taste

c)

sour taste

11.

How many total atoms are in this compound? Al2O3

a)

2

b)

5

c)

6

d)

3

12.

Is a copper penny turning greenish after a few years a chemical or physical change?

a)

Chemical Change

b)

Physical Change

13.

the starting materials in a chemical reaction are called what?

a)

Products

b)

Reactants

c)

Starters

d)

Enders

14.

a substance that is formed as the result of a chemical reaction is called

a)

Product

b)

Reactant

c)

Starters

d)

Enders

15.

A chemical reaction is when...

a)

Atoms and molecules are destroyed

b)

Atoms and molecules are created

c)

Atoms and molecules break apart and regroup to form new products

d)

Atoms and molecules go on vacation and relax a little

16.

The substances listed on the right side of a chemical equation are the

a)

Yields

b)

Reactants

c)

Products

d)

Precipitates

17.

The substances listed on the left side of a chemical equation are the

a)

Products

b)

Coefficients

c)

Precipitates

d)

Reactants

18.
Which is an example of a chemical change?
a)

Burning wood

b)

Rust on a car

c)

Cooking food

d)

All of the above

19.

A chemical reaction or process that releases heat.

a)

Endothermic

b)

Exothermic

20.

In making a pizza, which process involves a chemical change?

a)

mixing spices for the sauce

b)

slicing pepperoni for the topping

c)

spreading cheese on the pizza

d)

baking the dough to form the crust

21.

Examine the following chemical reaction:

H20 + CO2 → C6H12O6 + O2

What are the reactants?

a)

H20 + CO2

b)

C6H12O6 + O2

c)

→

d)

H20 + CO2→ C6H12O6 + O2

22.

Examine the following chemical reaction:

2H2O2 → 2H2O + O2

What are the products?

a)

2H2O2

b)

2H2O + O2

c)

2H2O2→2H2O + O2

23.

According to the Law of Conservation of Mass,

a)

matter is always created in a chemical reaction

b)

matter is always destroyed in a chemical reaction

c)

matter is created and then destroyed in a chemical reaction

d)

matter is not created or destroyed in a chemical reaction

24.

The law of conservation of mass can be demonstrated by a chemical reaction. Which of the following models of a chemical reaction best represents the law of conservation of mass?

a)
b)
c)
d)
25.

During a chemical reaction, atoms ____________ to form new substances.

a)

Change

b)

Switch

c)

Turn into new atoms

d)

Rearrange

26.

The law of conservation of mass says substances can neither be _______ nor ___________.

a)

Built; torn down

b)

Blended together; separated

c)

Created; destroyed

d)

Condensed; extracted

27.

Sodium and chlorine combine to form sodium chloride, or table salt. Sodium and chlorine are:

a)

Producers

b)

Products

c)

Reactionaries

d)

Reactants

28.

When sodium and chlorine combine to form sodium chloride, sodium chloride is the:

a)

Originator

b)

Reactant

c)

Product

d)

Produce

29.

In a chemical reaction, 4 grams of sodium must combine with how many grams of chlorine to produce 10 grams of table salt?

a)

4 grams

b)

6 grams

c)

8 grams

d)

10 grams

30.

How many oxygen atoms are in the products for the chemical reaction below? 4Fe + 3O2 → 2Fe2O34Fe\ +\ 3O_{2\ }\rightarrow\ 2Fe_2O_3  

a)

2

b)

3

c)

5

d)

6

31.

How many atoms are in the products below? 4Fe +3O2 → 2Fe2O34Fe\ +3O_{2\ }\rightarrow\ 2Fe_2O_3  

a)

7

b)

10

c)

17

d)

20

32.
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

33.
Is this equation balanced or unbalanced? 
H2 + O2 --> H2O
a)

balanced

b)

unbalanced

34.
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

35.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

36.

How many TOTAL atoms are in one molecule of oxygen gas (O2)

a)

0

b)

1

c)

2

d)

3

37.

How many TOTAL atoms are in one molecule of ammonia (NH3)

a)

1

b)

2

c)

3

d)

4

38.

How many nitrogen atoms are in one molecule of ammonia (NH3)

a)

1

b)

2

c)

3

d)

4

39.

On the pH scale, acidity _________ as you get closer to 0.

a)

Increases

b)

Decreases

40.

A substance with a pH of 7 is considered _________.

a)

an acid

b)

a base

c)

neutral

41.
The pH of a strong acid would be:
a)
1-2
b)
5-6
c)
8-9
d)
12-13
42.
The pH of a strong base would be:
a)
1-2
b)
5-6
c)
8-9
d)
12-13
43.
According to the pH range which substance is more acidic than lemon juice
a)
Hydrochloric acid
b)
cabbage
c)
milk
44.
A solution with a pH of 3.6 would be...
a)
Acid
b)
Base
c)
Neutral
d)
Acid and Base
45.

A burning match is an example of a(n) ____________________, where matter can enter from or escape to the surroundings.

a)

open system

b)

closed system

46.

_____________ reactions generally tend to feel warm, because of the release of thermal energy that occurs.

a)

Endothermic

b)

Exothermic

c)

Synthesis

d)

Decomposition

47.

In an _______________ system, matter is not able to enter or leave.

a)

Open

b)

Endothermic

c)

Exothermic

d)

Closed

48.
This type of system does not interact with the world around it. It does all the work by itself
a)
Closed System
b)
Open System
49.
This type of system requires interaction with the environment around it
a)
Closed System
b)
Open System
50.
A boiling pot of water on a stove is what type of system
a)
Closed System
b)
Open System
51.

Match the following

a)

dissolve

1.

to mix into another substance at the scale of individual particles

b)

precipitate

2.

to form an insoluble solid when two liquid solutions are mixed

c)

product

3.

the final substances present at the end of the reaction

d)

reactant

4.

the original substances present before a reaction takes place

e)

corrosive

5.

able to wear away solid materials

52.

Phenolphthalein indicator can detect

a)

acidic solutions

b)

basic solutions

c)

neutral solutions

d)

pure water

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