Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
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