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3B-3 & 3D Chemical Reactions and Equations

Total questions: 39

Worksheet time: 20mins

Name
Class
Date
1.

The energy required to make a reaction happen is called ___.

a)

activation energy

b)

endothermic

c)

exothermic

d)

conservation

2.

Which term belongs in position A?

a)

Endothermic

b)

Exothermic

c)

Environment

d)

Reaction

3.

Which term belongs in position B?

a)

Endothermic

b)

Exothermic

c)

Environment

d)

Reaction

4.

Which term belongs in position C?

a)

Endothermic

b)

Exothermic

c)

Environment

d)

Reaction

5.

Which term belongs in position D?

a)

Endothermic

b)

Exothermic

c)

Environment

d)

Reaction

6.

Would photosynthesis be considered endothermic or exothermic?

a)

Endothermic

b)

Exothermic

7.

Would cold packs be considered endothermic or exothermic?

a)

Endothermic

b)

Exothermic

8.

Would glow sticks be considered endothermic or exothermic?

a)

Endothermic

b)

Exothermic

9.

Would fire be considered endothermic or exothermic?

a)

Endothermic

b)

Exothermic

10.

Would electricity be considered endothermic or exothermic?

a)

Endothermic

b)

Exothermic

11.

To speed up a chemical reaction, you would have to ___ temperature.

a)

increase

b)

decrease

12.

To speed up a chemical reaction, you would have to ___ concentration.

a)

increase

b)

decrease

13.

To speed up a chemical reaction, you would have to ___ surface area.

a)

increase

b)

decrease

14.

The amount of a substance in a particular volume of space is called ___.

a)

concentration

b)

surface area

c)

catalyst

d)

inhibitor

15.

The amount of exposed surface is called ___.

a)

concentration

b)

surface area

c)

catalyst

d)

inhibitor

16.

A substance that speeds up chemical reactions is called ____.

a)

concentration

b)

surface area

c)

a catalyst

d)

an inhibitor

17.

A substance that slows down or stops chemical reactions is called ____.

a)

concentration

b)

surface area

c)

a catalyst

d)

an inhibitor

18.

Which of the following would speed up a chemical reaction?

a)

increase temperature

b)

decrease concentration

c)

add an inhibitor

d)

add a catalyst

e)

increase surface area

19.

Organic compounds are ___-based molecules.

a)

oxygen

b)

carbon

c)

hydrogen

d)

nitrogen

20.

What term belongs in position A?

a)

Reactants

b)

Products

c)

Yields

d)

Coefficient

e)

Subscript

21.

What term belongs in position B?

a)

Reactants

b)

Products

c)

Yields

d)

Coefficient

e)

Subscript

22.

What term belongs in position C?

a)

Reactants

b)

Products

c)

Yields

d)

Coefficient

e)

Subscript

23.

What term belongs in position D?

a)

Reactants

b)

Products

c)

Yields

d)

Coefficient

e)

Subscript

24.

What term belongs in position E?

a)

Reactants

b)

Products

c)

Yields

d)

Coefficient

e)

Subscript

25.

How many Magnesium atoms are in this molecule?


3 Mg(ClO4)2

a)

2

b)

3

c)

6

d)

1

26.

How many Chlorine atoms are in this molecule?


3 Mg(ClO4)2

a)

3

b)

4

c)

2

d)

6

27.

How many Oxygen atoms are in this molecule?


3 Mg(ClO4)2

a)

4

b)

12

c)

8

d)

24

28.

When balancing equations, which elements should you balance FIRST?

a)

Metals

b)

Nonmetals (not H or O)

c)

Hydrogen

d)

Oxygen

29.

When balancing equations, which elements should you balance SECOND?

a)

Metals

b)

Nonmetals (not H or O)

c)

Hydrogen

d)

Oxygen

30.

When balancing equations, which elements should you balance THIRD?

a)

Metals

b)

Nonmetals (not H or O)

c)

Hydrogen

d)

Oxygen

31.

What does the Law of Conservation of Mass mean?

a)

What goes in must come out.

b)

Matter is not created or destroyed.

c)

The number of atoms in the reactants equals the number in the products.

d)

The elements that react are also in the resulting compound(s).

32.

16 grams of nitrogen and 4 grams of hydrogen react to make ammonia. How many grams of ammonia are made?

a)

4 g

b)

12 g

c)

16 g

d)

20 g

33.

Which of the following is a balanced equations?

a)

H2O2 --> H2O + O2

b)

2 Fe2O3 + 3 C --> 4 Fe + 3 CO2

c)

2 Mg + HCl --> MgCl2 + H2

34.

Balance the following equation:

P4 + O2 --> P4O10

a)

P4 + 5 O2 --> P4O10

b)

P4 + O10 --> P4O10

c)

2 P4 + 5 O2 --> P4O10

35.

A chemical equation is balanced by changing ___.

a)

the coefficients

b)

the subscripts

c)

anything necessary

36.

What are the missing coefficients?

_ Fe + _ Cl2 --> _ FeCl3

a)

3, 2, 2

b)

4, 2, 2

c)

2, 3, 2

37.

What are the missing coefficients?

_ N2 + _ H2 --> _ NH3

a)

1, 3, 2

b)

1, 3, 3

c)

1, 1, 2

38.

Balance the following equation:

Mg + HCl --> MgCl2 + H2

a)

Mg + HCl --> MgCl2 + H2

b)

2 Mg + 2 HCl --> MgCl2 + H2

c)

Mg + 2 HCl --> MgCl2 + H2

39.

Chemical reactions always...

a)

result in a new substance.

b)

release energy.

c)

produce gas.

d)

cause a color change.

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