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Worksheets

Q4m78-RXn

Total questions: 50

Worksheet time: 27mins

Name
Class
Date
1.

What is the definition of chemical reaction?

a)

the input which reacts chemically to create product

b)

a system where none of the reactants or products are allowed to escape

c)

occurs when the atoms and molecules of two or more substances rearrange to form new substances

d)

the output, or result of a chemical reaction

2.

What is a reactant in a chemical equation?

a)

the input which reacts chemically to create product

b)

the output, or result of a chemical reaction

c)

a small molecule that makes up one part of a polymer

d)

compounds made of thousands of repeating smaller molecules

3.

What is a product in a chemical reaction?

a)

the input which reacts chemically to create product

b)

the output, or result of a chemical reaction

c)

a small molecule that makes up one part of a polymer

d)

compounds made of thousands of repeating smaller molecules

4.

What will weigh more when a chemical change is complete?  The reactants before the chemical reaction, or the product after the reaction is complete?

a)

They both will weigh the same

b)

The product always weighs more than the reactant

c)

The reactant will weigh more than the product

d)

They both will loose mass after the reaction

5.

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

6.

 A white baking soda solution was combined with white calcium chloride. Once combined the temperature increased, the substances bubbled, and were white in color. What indicators of a chemical change were shown?

a)

Temperature increase

b)

Color change

c)

Bubbling/fizzing

d)

Temperature increase and bubbling/fizzing

7.

The law of conservation of mass states that matter cannot be created nor __________________.

a)

destroyed

b)

rearranged

c)

transferred

d)

changed

8.

A __________________ chemical equation shows that the same number of atoms in the reactants are also in the product.

a)

balanced

b)

transferred

c)

rearranged

d)

beautiful

9.

In a closed system, a chemical reaction takes place.  The mass of the reactants in the beginning of the reaction is 25g.  What does the mass have to be in the end of the reaction in order to follow the law of conservation of mass?

a)

15 grams

b)

25 grams

c)

30 grams

d)

You can't tell with the given information.

10.

In a chemical reaction, the mass of the reactants was 15g.  The mass of the products was 12g.  Did this chemical reaction follow the law of conservation of mass?

a)

Yes

b)

No

c)

You can't tell with the given information.

11.

The following chemical reaction occurs:2S + 3O2 -> 2SO3.  How many atoms of oxygen are there in the reactant?

a)

1 atoms of oxygen

b)

2 atoms of oxygen

c)

3 atoms of oxygen

d)

6 atoms of oxygen

12.

The following chemical reaction occurs:N2 + 3 H2 -> 2 NH3.  How many atoms of hydrogen are there in the product?

a)

1 atom of hydrogen

b)

2 atoms of hydrogen

c)

3 atoms of hydrogen

d)

6 atoms of hydrogen

13.

The following chemical equation occurs:CH4 + 2O2 -> CO2 + 2H2O.   Does this equation follow the law of conservation of mass?  In other words, are there the same number of carbon, hydrogen, and oxygen atoms in the reactants and the products?

a)

Yes

b)

No

c)

You can't tell with the given information.

14.

There are two reactants in a chemical equation, and one product.  The mass of the product is 30g.  The mass of the first reactant is 17g.  What must the mass of the second reactant be, if the equation is to follow the law of conservation of mass?

a)

13 grams

b)

23 grams

c)

47 grams

d)

You cant tell with the given information

15.

How many elements are in C6H12O6?

a)

1

b)

2

c)

3

d)

4

16.

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

17.

Which of the following models best demonstrates a balanced chemical equation?

a)

F

b)

G

c)

H

d)

J

18.

Why must chemical equations be balanced?

a)

So that the equation doesn't explode

b)

The reaction won't happen until it is balanced

c)

Based on the Law of Conservation of Matter, matter cannot be created or destroyed.

d)

Based on the Law of Conservation of Energy, energy cannot be created or destroyed

19.

How many atoms of hydrogen (H), sulfur (S), and oxygen (O) are there in sulfuric acid (H2SO4)?

a)

H-6, S-4, O-4

b)

H-1, S-2, O-8

c)

H-2, S-1, O-4

d)

H-2, S-4, O-4

20.

Chemical reactions occur when _________ are broken and new bonds are formed.

a)

mixtures

b)

osteoclasts

c)

physical bonds

d)

chemical bonds

21.

Which are the reactants in the following reaction?   2Mg + O2 ---> 2MgO

a)

Mg and O2

b)

MgO

c)

Mg and MgO

d)

O2 and MgO

22.

What is the total number of atoms present in 5Na3PO4

a)

5

b)

8

c)

40

d)

55

23.

How many Mn atoms are found in the following compound?3Cr(MnO4)6

a)

3

b)

4

c)

6

d)

18

24.

What is the little number after an element in a chemical equation called? Sample: 4 and 6 in the equation below.

a)

Coefficient

b)

Subscript

c)

Atom

d)

Equation

25.

What is the number before a chemical formula called? Sample: 3 in the equation below.

a)

Coefficient

b)

Subscript

c)

Atom

d)

Equation

26.

Is the following equation balanced?

a)

Yes

b)

No

27.

Is the following equation balanced?

a)

Yes

b)

No

28.

Is the following equation balanced?

a)

Yes

b)

No

29.

Which of the following equation is balanced?

a)
b)
c)
d)
30.

The process by which one or more substances change to produce one or more different substances.

a)

Chemical Process

b)

Chemical Reaction

c)

Chemical Equation

d)

Balancing

31.

What type a reaction is taking place in this picture?

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

32.

What type of reaction involves the breaking down of a substance into simpler substances?

a)

Single Replacement Reaction

b)

Double Replacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

33.

What type of reaction involves 2 substances combining to form 1 new compound?

a)

Single Replacement Reaction

b)

Double Replacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

34.

What type of reaction involves one element replacing another element in a compound?

a)

Single Replacement Reaction

b)

Double Replacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

35.

What type of chemical reaction is this one?

a)

Synthesis

b)

Decomposition

c)

Combustion

d)

Single Replacement

e)

Double Replacement

36.

What type of chemical reaction is this one?

a)

Synthesis

b)

Decomposition

c)

Combustion

d)

Single Replacement

e)

Double Replacement

37.

What type of chemical reaction is this one?

a)

Synthesis

b)

Decomposition

c)

Combustion

d)

Single Replacement

e)

Double Replacement

38.

Combustion reactions will always involve _____.

a)

Oxygen and a solid

b)

Liquid nitrogen and heat

c)

Oxygen and heat/energy

d)

CO and H2O

39.

Balance this reaction:

a)

2,1,3,1

b)

1,2,1,2

c)

1,2,2,1

d)

2,1,1,2

40.

Balance this reaction:

a)

3,1,2,1

b)

1,2,3,4

c)

2,1,2,1

d)

1,2,1,2

41.

In a reaction, aqueous barium chloride reacts with aqueous potassium carbonate to produce solid barium carbonate and aqueous potassium chloride. what is the correct balanced equation?

a)
b)
c)
d)
42.

Choose the factor would have the greatest impact on the rate of reaction:

"Protein is broken down in the stomach by the enzyme pepsin."

a)

concentration

b)

temperature

c)

surface area

d)

catalyst

43.

Choose the factor would have the greatest impact on the rate of reaction:

"A dust explosion occurs in a saw mill."

a)

concentration

b)

temperature

c)

surface area

d)

catalyst

44.

Choose the factor would have the greatest impact on the rate of reaction:

"A mammoth is found, perfectly preserved near the Arctic circle.."

a)

concentration

b)

temperature

c)

surface area

d)

catalyst

45.

Choose the factor would have the greatest impact on the rate of reaction:

"Raw carrots are cut into thin slices for cooking."

a)

concentration

b)

temperature

c)

surface area

d)

catalyst

46.

Choose the factor would have the greatest impact on the rate of reaction:

"More bubbles appear when a concentrated solution of hydrochloric acid is added to magnesium strip than when dilute solution of acid is added.."

a)

concentration

b)

temperature

c)

surface area

d)

catalyst

47.

The rate of a reaction increases as temperature__________________.

a)

Decreases

b)

Increases

c)

Stays the Same

48.

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

49.

The ____________ states that atoms, ions, or molecules must collide in order to react.

a)

transition state

b)

activation energy

c)

rate law

d)

collision theory

50.

Which of the following will lower the rate of reaction?

a)

adding an enzyme to the reaction

b)

decreasing the temperature from 40°C to 10°C

c)

breaking a chunk of calcium up into smaller pieces

d)

increasing the amount of solute dissolved in a solution

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