Worksheets(TP2) chapter 7 Air
Total questions: 22
Worksheet time: 14mins
Air is (a) because the composition of air combines physically and can be separated by physical method
Air is mixture because the composition of air combines __(a)__ and can be separated by __(b)__ method.
(a) physically
(a) chemically
(b) physical
(b) chemical
Gas content in the device used in the picture
Oxygen
Inert gas
Nitrogen
Carbon dioxide
Gas content in the device in the picture
Oxygen
Inert gas
Nitrogen
Carbon dioxide
Gas content in the making of the material in the picture
Oxygen
Inert gas
Nitrogen
Carbon dioxide
Gas content in the object in the picture
Oxygen
Inert gas
Nitrogen
Carbon dioxide
Characteristics of carbon dioxide that allow it to be used as a fire extinguisher.
Does not support combustion
Colourless gas
Lower surrounding temperature
Decrease the concentration of oxygen
Covers the burning area so that oxygen supply is sparse
Hazardous activities that can cause fire
Playing with lighter
playing with firecrackers
Ironing clothes using electrical iron
not maintaining electrical wiring
cooking food with stove
Sources of Chlorofluorocarbon (CFC) pollution
Pollutants particles/gases that it emit
Carbon monoxide
Smoke
Soot
CFC
Pollutant particles/gases that it emit
Sulphur dioxide
Nitrogen dioxide
Soot
CFC
Air is matter
True
False
Clean air has smell and has no taste
True
False
Air is a mixture of various types of gas
True
False
The content of water vapour in the air is the same everywhere in the world
True
False
Nitrogen is the most abundant gas in the air
True
False
Oxygen is the most abundant gas in the air
True
False
Organisms requires carbon element to survive.
How do animals obtain carbon element for their body?
Animal breathing carbon dioxide
Animal eat plants and other animals
Animal self produce carbon for their body
Organisms requires carbon element to survive.
How do plants obtain carbon element for their body?
Green plants absorb carbon dioxide during photosynthesis
Some non-green plants absorbs carbon from dead plants and digesting insects to gain carbon
Plants self produce carbon for their body
Effect of excess carbon dioxide gas in the atmosphere
Causes greenhouse effect
Increases the Earth's temperature
The ozone layer becomes thin
Reduces the rate of photosynthesis in plants
Effect of CFC release by refrigerator and air conditioner
Causes greenhouse effect
Increases the Earth's temperature
The ozone layer becomes thin
More UV rays enter the Earth's atmosphere
Effect of haze caused by forest burning
Causes greenhouse effect
Reduces the light intensity that reaches the leaves
The ozone layer becomes thin
Reduces the rate of photosynthesis by the plants
