Chemistry Unit C1 Worksheet - Study And Revision Pack (Foundation Paper) (Page 5 of 34) in pdf

Chemistry Unit C1 Worksheet - Study And Revision Pack (Foundation Paper) Page 5

Q2.

Gases in the air

Some processes release carbon dioxide into the air.

Some processes remove carbon dioxide from the air.

(a) Use words from the box to complete the sentences.

combustion

condensation

dissolving

evaporation

photosynthesis

(i) Plants remove carbon dioxide from the air in the process known as

(1)

..............................................................................................................................................

(ii) Fossil fuels burn and release carbon dioxide into the air in the process known as

(1)

..............................................................................................................................................

(iii) Oceans remove carbon dioxide from the air by forming a solution.

This process is known as

(1)

..............................................................................................................................................

(b) Methane is a fossil fuel.

When methane is burned in air it reacts with oxygen.

The products are carbon dioxide and water.

Complete the word equation for this reaction.

(2)

methane + ............................................→............................................+............................................

The gas that makes up most of today’s atmosphere is

(1)

A argon

B carbon dioxide

C nitrogen

D oxygen

(d) The Earth’s early atmosphere contained carbon dioxide, water vapour and small amounts of

other gases.

At this time there were no seas or oceans on Earth.

Explain how the oceans formed from the early atmosphere.

(2)

..............................................................................................................................................

Chemistry Unit C1 Worksheet - Study And Revision Pack (Foundation Paper) Page 5