AQA unit 1 chemistry, gcse revision
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| how is cement made? | powdered limestone is heated in a kiln with powdered clay
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| what is limewater used for? | as a test for carbon dioxide and it turns limewater cloudy as a result
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| element | a substance only contains one type of atom
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| law of conservation | no atoms are lost or made during a chemical reaction so the mass of the products equals the mass of the reactions.
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| how is mortar made? | cement + sand + water
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| how is concrete made? | cement+ sand + aggregate
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| benefits of quarrying limestone | jobs for locals
useful material
cheap material
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| drawbacks of quarrying limestone | destoys habitat
visual pollution
creates noise
heavy traffic
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| sulfur dioxide | causes acid rain. mixes with clouds. forms dilute sulfuric acid. falls as acid rain-> causes lakes to become acidic= plants die, damages limestone buildings and statues.
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| properties of titanium | low density metal. very strong. corrosion resistant
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| limestone cycle- eqations | CaCO3->CaO+CO2->Ca(OH)2
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| limestone cycle- word equations | calcium carbonate-> Carbon oxide-> solid calcium hydroxide -> calcium hydroxide solution
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| more volatile? | turn into a gas at a lower temperature
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| Biodiesel: Pros | Carbon neutral. engines arent converted. produces less sulfur dioxide than ordinary diesel/petrol
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| Biodiesel: Con | can't make enough to completely replace petrol. expensive.
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| alernative fuels | ethanol.
biodiesel
hydrogen gas
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| first four alkAnes | methane CH4
Ethane C2H6
propane C3H8
Butane C4H10
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| Ethanol? | Produced from plant material=biofuel. Made by fermentation of plants- carsoften mixed w/petrol=better fuel.
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| Alkanes | are hydrocarbons that are saturated
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| ore? | metal that contains metal worth extracting
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| bioleaching | use of bacteria to extract metals from the ground
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| ductile? | able to be drawn into thin wires
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| delocalised | where electrons are free to move within structure, allows a charge to be carried
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| insoluble | will not dissolve in water
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| soluble | substance being dissolved
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| decompose | break down into simpler compounds or elements
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| Cracking? | Making a large hydrocarbon smaller (using heat and a catalyst.
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| CATALYST | speeds up reaction, lowers activation energy, usually a transition metal
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