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Science C1 Topic 2
GCSE edexcel core science chemistry: materials from the earth
Question | Answer |
---|---|
How are igneous rocks formed? | They are formed from solidified magma, either when it is erupted out from a volcano (forming extrusive rock) or when it cools in a chamber under the earth's surface (forming intrusive rock) |
What are some properties of igneous rocks and examples of the rock? | Interlocking crystals, hard, not porous, the size of crystals depends on the rate of cooling e.g. basalt, granite |
How are sedimentary rocks formed? | Rocks are weathered and eroded, sediments are transpored by water, wind or ice and are deposited, the sediments are compacted and then are cemented together. |
What are some properties of sedimentary rocks and examples of the rock? | Porous, rounded grains, may contain fossils, are susceptible to erosion, may contain layers, soft e.g. chalk, limestone, sandstone |
How are metamorphic rocks formed? | Rocks are put under great amounts of heat and/or pressure, new crystals form, creating a new rock |
What are some properties of metamorphic rocks and examples of the rock? | Very hard, interlocking crystals, not porous, non permeable, can contain layers e.g. limestone -> marble sandstone -> quartzite shale -> slate |
What are some examples of rocks that are natural forms of calcium carbonate? | Limestone, chalk, marble |
What is quarrying rock? | Mining for rock that is close to the surface |
What are the advantages of quarrying limestone in the UK? | *It allows people to use limestone all over the world * Cement, concrete and glass can be made * It can be used for building * It creates jobs * It boosts the UK economy |
What are the disadvantages of quarrying limestone in the UK? | * Quarries ruin places of natural beauty * Lorries cause traffic and are noisy * They also cause pollution * Quarries take up land space that may be valuable |
What is thermal decomposition? | When a compound breaks down due to heat |
What is the thermal decomposition of calcium carbonate? | Calcium carbonate -> calcium oxide + carbon dioxide |
How is cement made? | By heating limestone with powdered clay |
How is concrete made? | By mixing cement with sand, gravel and water |
How is glass made? | By heating limestone with sand and sodium carbonate |
What type of metal compounds decompose the fastest? | Less reactive metal carbonates |
What is the smallest part of an element that can take part in chemical reactions? | Atoms |
What happens to atoms during a chemical reaction? | They are rearranged to form new products with different physical and chemical properties to the reactants |
What is the law of conservation of mass? | It says that during a chemical reaction, mass in neither created nor destroyed- showing that atoms aren't created or destroyed (shown by a precipitation reaction) |
what is a precipitate reaction? | Where an insoluble product is produced from soluble reactants |
What is another use of calcium carbonate? | It can be used to neutralise acidic waste gases produced by a coal-fired power station, reducing harmful emmisions and reducing acid rain |
What substances can be used to neutralise soil acidity? | Calcium oxide, calcium hydroxide, calcium carbonate |
Calcium oxide + water -> ? | Calcium hydroxide- which can dissolve in water to form limewater |