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OCR GATEWAY CHEMISTRY C1 TEST
Karten in diesem Stapel (23)
- 1What is cracking?A chemical process that converts large hydrocarbons into smaller more useful hydrocarbon molecules.
- 2Name several problems which can occur whilst exploiting crude oil..Oil slicks on the surface of the sea which can damage beaches
. Damages birds feathers stopping them flying - 3What property of hydrocarbons lets fractional distillation of crude oil work?The hydrocarbons have different length chains and therefore different boiling points.
- 4What is a fuel?A substance that reacts with oxygen to release useful energy - mostly heat energy
- 5What is the general word equation for the complete combustion of a hydrocarbon?Hydrocarbon + Oxygen -> Carbon dioxide + water
- 6What is there a shortage of in 'incomplete combustion'?Air
- 7What is the general word equation for the incomplete combustion of a hydrocarbon?Hydrocarbon + oxygen -> carbon monoxide + carbon + water
(carbon forms small black particles called soot) - 8What percentage of the Earths gas is nitrogen?78%
- 9According to some scientists theories, how was the ocean created?Volcanoes erupted creating huge volumes of gas. The water vapour condensed to form the ocean.
- 10What process, used by plants, helped to increase the level of oxygen in the atmosphere until todays level?Photosynthesis
- 11What percentage of the worlds atmosphere is carbon dioxide?0.035%
- 12Name three factors that increase carbon dioxide levels..Human population increase
.Deforestation
.Use of fossil fuels - 13What is the name given to the object that is fitted to a vehicle exhaust system to convert CO into CO2?Catalytic converters
- 14How is NOx made?The high temperature and pressure inside an engine causes nitrogen and oxygen to react.
- 15What is the chemical formula for methane?CH4
- 16What is the difference between alkenes and alkanes?Alkenes are unsaturated, and have a double covalent bond.
Alkanes are saturated and have all single bonds. - 17Which family of hydrocarbons decolourises bromine water, alkanes or alkenes?Alkenes
- 18How are polymers made?When smaller molecules, monomers, join together.
Eg. Poly(ethene) - polymer made from ethene monomers - 19What is the reaction called when monomers join up to make polymers?Polymerisation
- 20What conditions are needed for polymerisation to happen?High pressure and a catalyst.
- 21What happens during addition polymerisation?Unsaturated monomer molecules react to form a saturated polymer molecule
- 22What does 'non-biodegradable' mean?A substance cannot be decomposed by bacterial action
- 23What is the name given to the process when protein is cooked and the molecules change shape?Denaturing
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- Triple Science OCR gateway. Chemistry C1 Test.
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