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Chapter 5 Chemistry Review

Total questions: 35

Worksheet time: 3hrs 55mins

Name
Class
Date
1.
In any chemical reaction, the mass of the products is always:
a)
slightly less than the mass of the reactants
b)
much less than the mass of the reactants
c)
the same as the mass of the reactants
d)
greater than the mass of the reactants
2.
Your mother used pancake mix, eggs, and milk to make pancakes.  Which of these is the product?
a)
the pancake mix
b)
the eggs
c)
the milk
d)
the pancakes
3.
Which of the following is a chemical change?
a)
the rusting of iron
b)
dissolving salt in water
c)
melting an ice cube
d)
bending a copper wire
4.
A change in the shape of an object is an example of _________________.
a)
a chemical change
b)
energy
c)
an endothermic change
d)
a physical change
5.
What type of change occurs when a new substance is formed that has different properties from the original substances?
a)
chemical change
b)
nuclear change
c)
physical change
d)
mutation
6.
In the reaction methane + oxygen turns into carbon dioxide + water, the methane and oxygen are called _______________.
a)
reactants
b)
products
c)
neutrals
d)
energizers
7.
A scientist combines chemicals and produces an exothermic reaction. What byproduct of this reaction would show that it is exothermic?
a)
heat
b)
coolness
c)
a precipitate
d)
gas bubbles
8.
Substance made up of chemically combined elements
a)
atom
b)
element
c)
electron
d)
compound
9.
Substances that form as the result of a chemical reaction
a)
products
b)
reactants
c)
coefficients
d)
subscripts
10.
Substances present at the start of a chemical reaction
a)
subscripts
b)
coefficients
c)
reactants
d)
products
11.
How many iron atoms are in 
Fe(NO3)2
a)
1
b)
2
c)
3
d)
6
12.
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
13.
12g of Carbon react with 16g of Oxygen, how much carbon monoxide (CO) is formed? 
a)
28 g
b)
4g
c)
30g
d)
12g
14.

When a log is burned, what happens to the wood?

a)

The mass stays the same, but becomes smoke and ash.

b)

It disappears.

c)

The mass changes as it goes away.

d)

Nothing. You're imagining things.

15.

What term is given to a reaction which transfers heat energy to the surroundings?

a)

Endothermic

b)

Reversible

c)

Exothermic

d)

Exotermic

16.

What type of reaction is shown in this energy profile diagram

a)

Exothermic

b)

Endothermic

17.

What type of reaction is shown in the energy profile diagram attached?

a)

Exothermic

b)

Endothermic

c)

Activation Energy

d)

Products

18.

What does 'X' represent in the energy profile shown here?

a)

Energy

b)

Products

c)

Reactants

d)

Reaction progess (time)

19.

What does 'Z' represent in the energy profile shown here?

a)

Reactants

b)

Energy

c)

Activation energy

d)

Products

20.

What does 'W' represent in the energy profile diagram shown?

a)

Energy

b)

Reactants

c)

Products

d)

Activation energy

21.

An instant icepack is an example of what type of reaction?

a)

Endothermic

b)

Exothermic

c)

Acid base

d)

Neutralisation

22.

Burning a match is an example of what type of reaction?

a)

Endothermic

b)

Exothermic

c)

Neutralisation

d)

Physical

23.

 O2(g) + 2 H2 (g) → 2 H2O (g) + HeatO_2\left(g\right)\ +\ 2\ H_2\ \left(g\right)\ \rightarrow\ 2\ H_2O\ \left(g\right)\ +\ Heat  

a)

endothermic

b)

exothermic

24.

 6 CO2+ 6 H2O + Heat → C6H12O6 + 6 O26\ CO_2+\ 6\ H_2O\ +\ Heat\ \rightarrow\ C_6H_{12}O_6\ +\ 6\ O_2 

a)

endothermic reaction

b)

exothermic reaction

25.

_____ reactions usually feel hot!

a)

endothermic

b)

exothermic

26.

____ reactions usually feel cold.

a)

endothermic

b)

exothermic

27.

H2O

How many types of elements are in this compound?

a)

1

b)

2

c)

3

d)

4

28.

Carbon (C) is considered an element while Carbon Dioxide (CO2) is considered a compound. That is because Carbon Dioxide is -

a)

a gas

b)

made of two elements

c)

given off by plants

d)

useful to us

29.

How many elements are present in this compound?

NaHCO3

a)

1

b)

2

c)

3

d)

4

30.

Compounds are different than elements because compounds are ---

a)

combinations of two or more elements.

b)

not able to be broken down into parts.

c)

made from the same type of atoms.

d)

a pure substance; elements are not.

31.
Is sugar (C12H22O11) an element or a compound?
a)
Element
b)
Compound
32.

Both elements and compounds are pure substances.

a)

Agree

b)

Disagree

33.

What does a chemical change result in?

a)

A change in state of the substance (ex. liquid to solid)

b)

A change in texture of the substance.

c)

A change in the way atoms are bonded to each other.

d)

A change in the appearance of the substance.

34.

During Chemical Reactions, the substances that are used are called?

a)

Precipitate

b)

Corrosion

c)

Reactants

d)

Products

35.

During Chemical Reactions, the new substances created are called?

a)

Precipitate

b)

Corrosion

c)

Reactants

d)

Products

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