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 |