IGCSE Gases in the atmosphere

In the modern day atmosphere, what is the approximate percentage of nitrogen?

• 0.04%

• 21%

• 78%

• 1%

What biochemical process absorbs carbon dioxide from the atmosphere and replaces it with oxygen?

• Respiration

• Digestion

• Photosynthesis

• Precipitation

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

What is the laboratory test for Oxygen gas?

• Puts out a glowing splint

• Makes a squeaky pop sound with a burning splint

• Relights a glowing splint

• Burns with blue color

Which gas makes up about 1% of the air?

• oxygen

• carbon dioxide

• argon

• hydrogen

Which of the following is a greenhouse gas?

• Oxygen

• Nitrogen

• Argon

• Carbon Dioxide

Which of the following is a cause of global warming?

• Burning fossil fuels to generate electricity

• Using wind farms to generate electricity

• Using solar cells to generate electricity

• Drilling for petroleum from earth crust

Which of the following is an effect of global warming?

• Flooding of low lying coastal land

• Longer days in the summer

• More crops to feed a growing world population

• High production of solar energy

What is the chemical name given to Rust ?

• Iron (II) oxide

• hydrated Iron (III) oxide

• Steel dioxide

• Carbon dioxide

When compound X is heated, it changes colour from green to black.

Compound Y is formed and a gas is given off which turns limewater milky.

X and Y are ......................................, respectively.

• calcium carbonate and calcium oxide

• copper carbonate and carbon

• copper carbonate and copper oxide

• copper sulfate and copper oxide

When limestone is heated it forms lime (calcium oxide) and carbon dioxide.

CaCO3(s) → CaO(s) + CO2(g)

Which statement is NOT correct?

• Carbon dioxide is a greenhouse gas which may contribute to climate change.

• Slaked lime is used to neutralise acidic soil.

• The lime can be used to treat alkaline soil.

• This reaction is an example of thermal decomposition.