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combustion

Total questions: 35

Worksheet time: 21mins

Name
Class
Date
1.

Why do we need food to break apart the food we eat?

a)

So it can fit into our stomachs

b)

So our bodies can use the nutrients from the food

c)

So liquids can be separated from solids

d)

So that our bodies' enzymes have something to do.

2.

Where does digestion begin?

a)

Our teeth

b)

Our stomach

c)

The esophogus

d)

Small intestines

3.

Chewing is an example of what type of digestion?

a)

Dental

b)

Fragmentary

c)

Chemical

d)

Mechanical

4.

Place the following events in sequence: A) Food enters your large intestines

B) Food enters your small intestines

C) Food enters your esophagus

a)

A, B, C

b)

C, B, A

c)

C, A, B

d)

B, A, C

5.
A combustion reaction is when
a)
A fuel burns realeasing heat and light energy
b)
A substance burns and goes black
6.
The reactants of all combustion reactions are
a)
Fuel and Water
b)
Fuel and Oxygen
c)
Fuel and heat
7.
When a fuel is burnt the gases released are
a)
Oxygen and Carbon
b)
Carbon dioxide and Water
c)
Sulfur dioxide
8.
The test for carbon dioxide is
a)
Limewater turning cloudy
b)
Cobalt chloride paper turning from blue to pink
9.
The test for water is
a)
Limewater turning cloudy
b)
Cobalt chloride paper turning from blue to pink
10.
Combustion reactions are an example of an exothermic reaction because
a)
they release light
b)
they release heat
c)
they give out smoke
11.
The fuel used in a petrol engine is
a)
coal
b)
petrol or diesel
c)
water
12.
When cars burn fuels they release the greenhouse gas __________ which is leading to global warming
a)
Oxygen
b)
water
c)
Carbon dioxide
13.
Incomplete combustion occurs when
a)
there is not enough oxygen
b)
there is not enough fuel
14.
The product of incomplete combustion which is toxic to humans is
a)
Carbon monoxide
b)
water
c)
soot
15.
The product of incomplete combustion which causes respiratory problems
a)
Carbon monoxide
b)
water
c)
soot
16.

Complete the equation for complete combustion

Fuel+ Water -----> (a)   + water

17.

Complete the equation for incomplete combustion

Fuel + Water -----> carbon monoxide + water + (a)  

18.
Which of these isn't in the fire triangle?
a)
Fuel
b)
Heat
c)
Oxygen
d)
Carbon dioxide
19.
Another term for burning is
a)
Fire triangle
b)
Magnesium oxide
c)
Combustion
d)
Bustion
20.
Is combustion a reversible reaction?
a)
Yes.
b)
No.
21.
Water is not used to control fires involving electrical appliances.
a)
False
b)
True
22.
A good fuel burns neither too fast nor too slowly.
a)
True
b)
False
23.
Which of the following is not a combustible substance?
a)
Wood
b)
Cow dung cake
c)
stone
d)
paper
24.
Which of these is NOT an essential part of fire.
a)
Fuel.
b)
Friction.
c)
Heat.
d)
Oxygen.
25.
The conditions which are required for combustion to take place are:
a)
fuel
b)
heat
c)
oxygen
d)
all of these
26.
Which one of the following is not a fossil fuel?
a)
Wood
b)
Coal
c)
Petroleum
d)
Natural Gas
27.
Which type of fire extinguisher should be used on a fire involving flammable liquids such as grease or oil?
a)
Water
b)
Carbon Dioxide 
c)
Dry Chemical
d)
Foam
28.
A compound that contains only carbon and hydrogen and that produces carbon dioxide and water when burned is called a(n)
a)
binary compound
b)
carbonate
c)
ionic compound
d)
hydrocarbon
29.
True or false, bubbling is a sign of a chemical reaction?
a)
True
b)
False
30.
What part of the fire triangle do you remove by spraying water onto a fire?
a)
Heat
b)
Oxygen
c)
Fuel
31.
The word equation for combustion is: fuel + oxygen --> water + ________ __________
a)
Carbon dioxide
b)
Limewater
32.
What do we use limewater to test for?
a)
Carbon dioxide
b)
Water
c)
Heat
d)
Smoke
33.
Why do we burn a fuel?
a)
I don't know.
b)
To release energy
c)
To lose energy
d)
To produce carbon dioxide
34.

How do you test for water from a combustion reaction?

a)

Squeaky pop test

b)

Lime water

c)

Cobalt chloride paper

d)

Chloric cobalt paper

35.

When Cobalt chloride reacts with water it changes from..

a)

blue to pink

b)

pink to blue

c)

yellow to orange

d)

red to blue

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