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WorksheetsG8 Week 23 Combustion & Density
Total questions: 20
Worksheet time: 13mins
Name
Class
Date
1.
Which one of these is not in the fire triangle?
a)
Fuel
b)
Heat
c)
Oxygen
d)
Carbon dioxide
2.
Another term for "burning" is:
a)
Fire triangle
b)
Magnesium oxide
c)
Combustion
d)
Bustion
3.
The ignition temperature is the temperature below which a substance does not burn, even in the presence of supporters of combustion.
a)
True
b)
False
4.
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
5.
Which one of the following is not a fossil fuel?
a)
Wood
b)
Coal
c)
Petroleum
d)
Natural Gas
6.
Which type of coal provides the most heat energy per gram of fuel burned?
a)
lignite
b)
bituminous
c)
anthracite
7.
What is the typical efficiency of a coal burning power plant?
a)
less than 25%
b)
25-30%
c)
30-50%
d)
100%
8.
Which of the following fuel has highest energy value (calories)?
a)
Wood
b)
coal
c)
Hydrogen
d)
petrol
9.
A chemical reaction in which a compound or element burns by reacting with oxygen is called a(n):
a)
combination reaction
b)
decomposition reaction
c)
combustion reaction
d)
carbonate decomposition reaction
10.
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
11.
2C8H18 + 25O2 => 16CO2 + 18H2O is an example of a
a)
combination reaction
b)
decomposition reaction
c)
combustion reaction
d)
complete combustion reaction
12.
Jack has a rock. The rock has a mass of 14g and a volume of 2cm3. What is the density of the rock?
a)
7 mL
b)
7 g/cm3
c)
28 g/cm3
d)
1/7 g/cm3
13.
What is the volume of Object X?
a)
10.0 cm3
b)
15.0 cm3
c)
20.0 cm3
d)
25.0 cm3
14.
Put the liquids in order from most dense to least dense?
a)
4, 3, 2, 1
b)
1, 2, 3, 4
c)
3, 4, 2, 1,
d)
4, 3, 1, 2
15.
Which liquid is the least dense?
a)
oil
b)
water
c)
syrup
d)
plastic bottle
16.
Which box has a higher density?
a)
Box A
b)
Box B
c)
cannot be determined
d)
they are the same
17.
What is the formula for density?
a)
density = mass x volume
b)
density = mass / volume
c)
density = mass + volume
d)
density = mass - volume
18.
In general what is the most dense form of matter?
a)
solid
b)
liquid
c)
gas
d)
plasmas
19.
Frank has an eraser. It has a mass of 4g, and a volume of 2cm3. What is its density?
a)
8 g/cm3
b)
2 g/cm3
c)
1/2 g/cm3
d)
24 g/cm3
20.
Calculate the density of the cube.
a)
2 g/cm3
b)
4 g/cm3
c)
6 g/cm3
d)
8 g/cm3
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