Karteikarten
Chemistry 7 Our Changing Planet GCSE core
Karten in diesem Stapel (20)
- 1Name the main parts of the earth, starting from its centre.Inner core → Outer Core → Mantle → Crust → Atmosphere
- 2Why should we be careful not to waste the earth's resource'sThe raw materials and materials we depend on come from the crusts, the oceans and the atmosphere therefore they are limited and will run out.
- 3Name three gases that scientists think were in the Earth's early atmonsphereCarbon Dioxide → Ammonia → Methane
- 4Name Four gases that are now in the atmosphereCarbon Dioxide → Oxygen → Nitrogen → Argon
- 5How did the oceans form?As the earth cooled most of the water vapour condensed to form oceans
- 6What what the effect of algae and plants on the early atmosphere?The amount of carbon dioxide decreased and amount of oxygen increased
- 7What are tectonic plates?The earth's crust and upper part of the mantle is cracked into massive pieces called tectonic plates
- 8Why do tectonic plates move?Because of convection currents in the mantel that are caused by radioactive decay
- 9How much do tectonic plates move in a year and what is this called?A few centimetres → continental drift
- 10What happens at plate boundaries?A huge force builds up, eventually the rocks give in changing shape causing earthquakes, volcanoes or mountains to form.
- 11Why have the amounts of of gases in the atmosphere been the same for almost 200 Million years?Because they was stabilised 200 millions years ago
- 12How are the main gases in the air separated?Fractional distillation
- 13What is used in industry as raw materials?The main gases in the air after being separated by fractional distillation
- 14Why were Wegners ideas not accepted untill the 1960's?Because he could not explain why the continents moved. in 1960 scientists found new evidence.
- 15Why are there so many theories about how life began?Because they are all unproven so we cannot be sure how life began
- 16What did Miller and Urey find in their experiment?That amino acids that were the building blocks for protein, had been produced.
- 17What was Miller and Ureys experiment?They used a mixture of water, ammonia, methane and hydrogen and a high voltage spark to stimulate lightening.
- 18What is meant by 'Primordial Soup'?a solution rich in organic compounds in the primitive oceans of the earth, from which life is thought to have originated.
- 19Why is the fractional distillation of liquid air done industrially?To produce pure oxygen and liquid nitrogen, which have important uses.
- 20Explain briefly how Fractional distillation of liquid is done?The air is cooled below -200ºC and fed into a fractional distillation column → Nitrogen is separated from oxygen and argon and further distillation is used to produced pure oxygen and argon.
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- GCSE Chemistry Karteikarten am Chemistry 7 Our Changing Planet GCSE core, erstellt von Chloe Roberts am 27/04/2014.
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- Chloe Roberts
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