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Year 9 Chemical Reactions Revision

Total questions: 86

Worksheet time: 50mins

Name
Class
Date
1.

Acids are neutralised by...

a)

Bases

b)

Metals

c)

Water

d)

Hydrogen gas

2.

Acids have a pH

a)

greater than 7

b)

lower than 7

c)

equal to 7

3.

Bases have a pH...

a)

greater than 7

b)

lower than 7

c)

equal to 7

4.

When equal amounts of acid are mixed with a base they produce a solution with a pH...

a)

Greater than 7

b)

Lower than 7

c)

Equal to 7

5.

Acids release...

a)

Hydrogen ions

b)

Hydroxide ions

c)

Sodium ions

d)

Hydrogen gas

6.

Acids release...

a)

H+

b)

OH-

c)

H2

7.

Bases release...

a)

H+

b)

OH-

c)

H2

8.

Bases release...

a)

Hydrogen ions

b)

Hydroxide ions

c)

Sodium ions

d)

Hydrogen gas

9.

The formula for hydrochloric acid is...

a)

HCl

b)

H2Cl

c)

H2SO4

d)

HSO4

10.

Vinegar CH3COOH is ...

a)

An acid

b)

A base

c)

A salt

11.
Which is the stronger acid?
a)
pH 1
b)
pH 4
c)
pH 8
d)
pH 13
12.

The pH of a solution is tested, and it is found to be a basic solution. Of the following choices, what could the pH have been?

a)

3

b)

7

c)

9

d)

5

13.

pH is the measure of the concentration of ______.

a)

Acids

b)

H+ ion

c)

OH- ion

d)

Base

14.

Stronger acids have a pH closer to...

a)

7

b)

14

c)

0

d)

9

15.

Weaker bases have a pH closer to...

a)

8

b)

14

c)

0

d)

4

16.

________________ are reversible and have some of the properties of their substance change

a)

Physical changes

b)

Chemical changes

c)

Reactants

d)

Products

17.

_______________ are irreversible and have one or more new substances formed

a)

Physical changes

b)

Chemical changes

c)

Reactants

d)

Products

18.

The signs of a chemical change are

a)

Temperature change

b)

Gas is produced

c)

Colour change

d)

Precipitate

e)

All of the above

19.

Which of the following is not an example of a physical change?

a)

Sour milk

b)

Dissolving sugar and water

c)

Chopping wood

d)

Boiling water

20.

Which of the following is a chemical change?

a)

Shredding paper

b)

Breaking a glass

c)

Baking a cake

d)

Melting an ice cube

21.

Which of the following is not an example of a chemical change?

a)

Melting of butter

b)

Burning a piece of paper

c)

Rusting of iron

d)

Fireworks

22.
A change that alters the physical properties of a substance without changing its composition.
a)
Physical Change
b)
Chemical Change
23.
Any change in the state of matter of a substance is a...
a)
Physical Change
b)
Chemical Change
24.
A change in matter that forms one or more new substances with new chemical properties is a/an...
a)
Physical Change
b)
Chemical Change
25.
Is mold growing on cheese a physical or chemical change?
a)
Physical 
b)
Chemical
26.

Evidence of Physical change (select all that apply)

a)

Change of State

b)

Change in Shape

c)

Change in Colour

d)

Formation of a gas

27.

Evidence of Chemical Change (select all that apply)

a)

Change in Colour

b)

Heat Produced

c)

Change of Shape

d)

Light Produced

28.

Putting red food collaring and blue food colouring in a beaker of water which results in purple water is an example of a (a)   change.

29.
The substances that are present before a reaction are the...
a)
reactants
b)
products
c)
both of these
d)
neither of these
30.
___________________ are the elements or compounds that are formed in a chemical
reaction.
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
31.
A change in the size, shape, or state of matter.
a)
chemical change
b)
physical change
c)
chemical reaction
d)
electron change
32.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
33.
The only way you can be certain that a chemical reaction has occurred is by? 
a)
Light has been emitted 
b)
a colour change has occurred 
c)
bubbles appear 
d)
identifying one or more new chemical products 
34.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
35.

In an endothermic reaction, heat is ...

a)

taken in

b)

given out

36.

Is this endothermic or exothermic?

a)

exothermic

b)

endothermic

37.

Is this endothermic or exothermic?

a)

exothermic

b)

endothermic

38.

Ms. Carter poured salt into a cup of water and the salt dissolved. No new substances were made and the temperature of the water stayed the same. What type of reaction occurred?

a)

Exothermic Reaction

b)

Endothermic Reaction

c)

No reaction occurred (no chemical change occurred)

39.

Temperature changes are due to changes in ________

a)

Matter

b)

Energy

c)

Motion

d)

Bonds

40.

What type of reaction occurs in hand warmers?

a)

exothermic

b)

endothermic

41.

If a chemical reaction is EXOTHERMIC, the temperature would....

a)

stay the same

b)

increase

c)

decrease

42.

In an endothermic reaction, heat is ...

a)

absorbed

b)

released

43.

 In an exothermic reaction, heat is ...

a)

absorbed

b)

released

44.

What type of reaction is this?

a)

Exothermic

b)

Endothermic

c)

Energy Producing

d)

No way to tell

45.

The graph above is from which type of reaction?

a)

Endothermic reaction

b)

Exothermic reaction

46.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
47.
Is photosenthysis an Exothermic or an Endothermic reaction?
a)
Endothermic
b)
Exothermic
48.

During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel (a)   . 

49.
A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true? 
a)
The temperature changed 
b)
It is an endothermic reaction
c)
It is an exothermic reaction 
d)
Two of the answers are correct 
50.
Have you ever eaten sherbet sweets candy? They fizz in your mouth and your tongue feels cold. Why do you think that is?
a)
It is an exothermic reaction
b)
It is an endothermic reaction
c)
It is made of ice
d)
It is dissolving your mouth
51.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-14
d)
1-20
52.
What is the only substance with a neutral pH of 7?
a)
Milk
b)
Orange Juice
c)
Water
d)
Blood
53.
A solution with a pH of 3.6 would be...
a)
Acid
b)
Base
c)
Neutral
d)
Acid and Base
54.
A solution with a pH of 8.6 would be...
a)
Acid
b)
Base
c)
Neutral
d)
Acid and Base
55.

What tastes sour?

a)
Acids
b)
Bases
c)
Salts
d)
All
56.

What tastes bitter?

a)
Acids
b)
Bases
c)
Salts
d)
All
57.
According to the pH range which substance is more acidic than lemon juice
a)
Hydrochloric acid
b)
cabbage
c)
milk
58.

In a basic solution, litmus paper will turn...

a)
Blue
b)
No Change
c)

Red

59.

In an acidic solution, litmus paper will turn...

a)

Red

b)
No change
c)

Blue

60.
A solution with a pH of 7.0 would have...
a)
more H ions than OH ions
b)
more OH ions than H ions
c)
equal number of H and OH ions
d)
None of these.
61.
Litmus paper is an indicator of acids and bases, it turns red for bases.
a)
True
b)
false
62.
Bases will turn litmus paper __________, while acids will turn litmus paper __________.
a)
blue.....red
b)
red.....blue
c)
pink.........colourless
d)
colourless..........pink
63.
An indicator will ______________ when it is in contact with an acid or base
a)
Bubble
b)
Form a new substance
c)
Change color
d)
Stay the same color
64.
What is a substance that is one color in an acid and another color in a base? 
a)
Oxidizer
b)
Indicator
65.
According to the image, the substance tested is a...
a)
Acid
b)
Neutral
c)
Strong Acid
d)
Base
66.
Examine the results (color change) of the pH paper shown in the picture.  What type of substance was tested?
a)
an acid
b)
a base
c)
a neutral substance
d)
none of the above
67.

Which substance is a WEAK ACID

a)

Pure Water

b)

Milk

c)

Eggs

d)

Bleach

68.
When you vomit it tastes sour because
a)
your stomach contains an acid
b)
your stomach contains an alkali
69.

What ions are there more of in acidic solutions?

a)

H+ (H3O+)

b)

OH-

70.

What ions are there more of in basic solutions?

a)

H+ (H3O+)

b)

OH-

71.

Which indicator would best show a WEAK base?

a)

Methyl Orange

b)

Thymol Blue

c)

Bromophenol Blue

d)

Alizarin Yellow

72.
A solution has a pH of 7.0.  What would happen to the pH if H ions were added?
a)
pH would go up
b)
pH would go down
c)
pH would stay the same
d)
None of these
73.

A substance that is a base has more OH- ions than H+ ions.

a)

True

b)

False

74.

What type of reaction occurs when you react an acid with a base?

a)

combustion

b)

neutralisation

c)

synthesis

d)

decomposition

75.

metal + acid → ? + ?

a)

salt + hydrogen

b)

salt + water

c)

salt + carbon dioxide

76.

Magnesium hydroxide + hydrochloric acid → water + ________

a)

magnesium chloride

b)

magnesium oxide

c)

magnesium oxygen

d)

magnesium chlorine

77.

What type of reaction occurs when you react an acid with a base?

a)

combustion

b)

decomposition

c)

no reaction

d)

neutralisation

78.

A neutralisation reaction produces...

a)

Acids

b)

Bases

c)

neutral water

d)

pH > 7

79.
What gas is produced when a metal reacts with an acid?
a)
Water vapour
b)
Acidic gas
c)
Hydrogen
d)
Nitrogen
80.
Metals that react quickly/strongly with water and acids are called?
a)
Reactive
b)
Unreactive
c)
Dangerous
d)
Corrosive
81.
How can you tell that a metal is reacting with water?
a)
Colour change
b)
Bright light
c)
Fizzing
d)
It gets colder
82.

The reactants for a neutralisation reaction are...

a)

An acid and a base

b)

A salt and water

c)

A fuel and oxygen

d)

Carbon dioxide and water

83.

In a neutralisation reaction the H+ and OH- react to form...

a)

Carbon dioxide (CO2)

b)

Water (H2O)

c)

Salt

d)

Oxygen (O2)

84.

Which of the following is the word equation for the reaction between acids and carbonates?

a)

metal + acid → salt + hydrogen

b)

carbonate + acid → salt + water

c)

carbonate + acid → salt+ carbon dioxide + hydrogen

d)

base + acid → salt + water

85.

The word equation for an acid reacting with a metal is

a)

acid + metal →\rightarrow  salt + carbon dioxide + water

b)

acid + base  →\rightarrow  salt + water

c)

acid + metal  →\rightarrow  salt + hydrogen

d)

acid + metal  →\rightarrow  salt + water

86.

Which of the following is a neutralization reaction?

a)

2Na + Cl2 → 2NaCl

b)

CH4 + 2O2 → CO2 + 2H2O

c)

HCl + KOH → KCl + H2O

d)

CaCO3 → CO2 + CaO

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