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Unit 1
AQA unit 1 chemistry, gcse revision
| Question | Answer |
|---|---|
| how is cement made? | powdered limestone is heated in a kiln with powdered clay |
| what is limewater used for? | as a test for carbon dioxide and it turns limewater cloudy as a result |
| element | a substance only contains one type of atom |
| 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. |
| how is mortar made? | cement + sand + water |
| how is concrete made? | cement+ sand + aggregate |
| benefits of quarrying limestone | jobs for locals useful material cheap material |
| drawbacks of quarrying limestone | destoys habitat visual pollution creates noise heavy traffic |
| 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. |
| properties of titanium | low density metal. very strong. corrosion resistant |
| limestone cycle- eqations | CaCO3->CaO+CO2->Ca(OH)2 |
| limestone cycle- word equations | calcium carbonate-> Carbon oxide-> solid calcium hydroxide -> calcium hydroxide solution |
| more volatile? | turn into a gas at a lower temperature |
| Biodiesel: Pros | Carbon neutral. engines arent converted. produces less sulfur dioxide than ordinary diesel/petrol |
| Biodiesel: Con | can't make enough to completely replace petrol. expensive. |
| alernative fuels | ethanol. biodiesel hydrogen gas |
| first four alkAnes | methane CH4 Ethane C2H6 propane C3H8 Butane C4H10 |
| Ethanol? | Produced from plant material=biofuel. Made by fermentation of plants- carsoften mixed w/petrol=better fuel. |
| Alkanes | are hydrocarbons that are saturated |
| ore? | metal that contains metal worth extracting |
| bioleaching | use of bacteria to extract metals from the ground |
| ductile? | able to be drawn into thin wires |
| delocalised | where electrons are free to move within structure, allows a charge to be carried |
| insoluble | will not dissolve in water |
| soluble | substance being dissolved |
| decompose | break down into simpler compounds or elements |
| Cracking? | Making a large hydrocarbon smaller (using heat and a catalyst. |
| CATALYST | speeds up reaction, lowers activation energy, usually a transition metal |
Created by:
CBA