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Chemical Reactions

Total questions: 32

Worksheet time: 20mins

Name
Class
Date
1.
In an endothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released 
2.
Baking bread and cooking an egg are examples of....?
a)
Endothermic processes
b)
Exothermic processess
c)
None of these 
3.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
4.
What is essential for a combustion reaction to begin?
a)
Carbon dioxide
b)
Fuel 
c)
Fuel, oxygen and heat
d)
Water and oxygen
5.
Ice melting
a)
Chemical Change
b)
Physical Change
6.
What happens in ALL chemical changes?
a)
Change in state of matter
b)
A new substance is formed
c)
Bubbles are produced
d)
An explosion
7.
Water can dissolve many things so it is called the .....
a)
wonderful water
b)
cohesion
c)
liquid
d)
universal solvent
8.
The thing that does the dissolving
a)
Solute
b)
Solvent
c)
Colloid
d)
Solution
9.
What is a solute?
a)
The substance that does the dissolving in a solution.
b)
The substance that is dissolved into the solution.
c)
The mixing of different substances.
d)
The process in which neutral molecules lose or gain electrons
10.

Hydrocarbon is made of what two elements?

a)

Carbon monoxide

b)

Hydrogen

c)

Carbon

d)

Oxygen

e)

Calx

11.

Products of complete combustion

(a)  

12.

Products of incomplete combustion

(a)  

13.
What is essential for a combustion reaction to begin?
a)
Carbon dioxide
b)
Fuel 
c)
Fuel, oxygen and heat
d)
Water and oxygen
14.

8.7: Combustion is when a __________ reacts with oxygen

a)

petrol

b)

fuel

c)

fire triangle

d)

carbon dioxide

15.
What are the types of combustion?
a)
Complete & incomplete
b)
Incomplete & inexact
c)
Impossible & complete
d)
Computer & incompete
16.
Complete combustion is when there is plenty of oxygen to react with. 
a)
True
b)
False
17.

Why do we burn a fuel?

a)

To have fun

b)

To release energy

c)

To lose energy

d)

To produce carbon dioxide

18.

What is the colour of phenolphthalein an acid?

a)

Pink

b)

Yellow

c)

Orange

d)

Colourless

19.

What is the colour of litmus in an acid ?

a)

Pink

b)

Yellow

c)

Red

d)

Colourless

20.

What is the colour of litmus in a base ?

a)

Pink

b)

Blue

c)

Red

d)

Colourless

21.

What is the colour of phenolphthalein in a base ?

a)

Pink

b)

Blue

c)

Red

d)

Colourless

22.

What is the colour of litmus in neutral?

a)

Pink

b)

Orange

c)

Yellow

d)

Purple

23.

What is the possible pH of dilute Sulphuric (VI) acid?

a)

1.0

b)

7.0

c)

12.0

d)

5.0

24.

Indicators changes _______________  when mixed with acids and bases.

a)

shape

b)

colour

c)

state 

25.

Which Ph Scale number shows an acid?

a)

14

b)

11

c)

7

d)

4

26.

Which Ph Scale number shows an base?

a)

1

b)

3

c)

7

d)

10

27.

On the pH scale the number 7 indicates the substance is?

a)

acidic

b)

neutral

c)

alkaline

28.
The pH scale is a range from:
a)
1-7
b)
0-14
c)
1-5
d)
1-20
29.
A(n) ______ is a substance with a pH less than 7
a)
Acid
b)
Alkaline
c)
Base
d)
Buffer
30.
A(n) _______ is a substance with a pH greater than 7.
a)
Base
b)
Acid
c)
Buffer
d)
Water
31.

In a test of pH levels, a baking soda has a pH of 9 and bleach has a pH of 12. What is true about there relationship?

a)

Both of the solution are Bases

b)

Both of the solution are Acids

c)

The Baking soda is an acid and the Bleach is a base

d)

The baking soda is a base and the Bleach is an Acid.

32.
According to the pH range which substance is more acidic than lemon juice
a)
Hydrochloric acid
b)
cabbage
c)
milk

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