GCSE Chemistry Earth and Atmospheric science (LC3 topic 10)

Gases produced by ​ ​ (a)   Formed the Earth's early atmosphere

• Volcanic activity
• Meteors
• Cracks in the ground
• Earthquakes

The Earth's early atmosphere was thought to have:

Little or no ​ (a)  

• oxygen
• Carbon dioxide
• Water vapour
• other gasses
• Methane

The Earth's early atmosphere was thought to contain a large amount of : ​ (a)   and​ (b)   , but small or no amounts of ​ (c)  

• Carbon Dioxide
• Oxygen
• Methane
• Water vapour

Apart from Carbon Dioxide, the Earth's early atmosphere was also thought to contain large amounts of ​ (a)   ​

• Water vapour
• Carbon Dioxide
• Other gasses
• Nitrogen
• Oxygen

Match the following

• Volcanic activity

• Oxygen

• Created through photosynthesis

• Water vapour

• Earth cooled down, condensing the vapour

• Oceans

• Volcanic activity and meteors

• Carbon dioxide

Put the important events of our atmosphere in the right order. Oldes at the top, most recent at the bottom.

• The atmosphere today has 78%nitrogen, 21%oxygen, 0.9%argon, 0.04 CO2 , 0.06%other gasses

• Volcanic activity produced an atmosphere high in CO2 and Water vapour, with little to no oxygen

• CO2 levels decreased as more carbon dioxide dissolved into the ocean

• O2 levels increased because of the presence of plants which created O2 due to photosynthesis

• As the Earth cooled down, water vapour in the atmosphere condensed to form oceans

Match the assumption to the evidence

• No oxygen in earliest known atmosphere

• The oldest rocks that contain any type of iron oxide is about 2.4 billion years old

• Oldest fossils date over 3 billion years

• Scientists think that oxygen production by organisms started 3 billion years ago

• 21% oxygen today

• The earliest known rocks contain iron compounds that would form id there were no oxygen around. Eg. Iron pyrite

• alot of oxygen at 1.8 billion

• Heating copper in a sealed gas syringe containing 100cm3 of air should reduce the volume by 21cm3

• little oxygen started to collect at 2.4b

• Rocks dating from 1.8 billion years ago contain a different type of iron oxide which forms when there is much more oxygen present

Match the following element to its test:

• Oxygen

• Will turn copper (ii) sulphate blue

• Hydrogen

• Pop when exposed to open flame

• Water

• Relight a glowing splint

The presence of primitive plants lead to the increase of ​ (a)   but the decrease of ​ (b)   in the atmosphere.

• Oxygen
• Hydrogen
• Carbon Dioxide
• Carbon

Which of these gasses are:

Groups:

(a) A Greenhouse gas

,

(b) not a greenhouse gas

• Nitrogen

• Argon

• Nitrous Oxides

• Water Vapour

• Helium

• Carbon Dioxide

• Hydrogen

• Methane