Core Science; Chemistry

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  • Created on: 09-09-12 17:21
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Moonisah Mirza
Chemistry core science:
1. Draw and atom and label it.
2. What is an element? They are substance made up of only one type of atom.
3. What is a compound? They are substances made up of different atoms.
4. What does the formula Fe2 O3 tell you about this compound? It is a compound as it contains 2
different types of atoms and the name for this is iron oxide.
5. What is limestone? It is a rock made up of mainly calcium carbonate.
6. How do we obtain it? By digging it out of the ground
7. What is its chemical formula? And its chemical name?CACO3- calcium carbonate
8. What is limestone used for? Used as building material.
9. Write down the equation of the reaction of limestone with heat?CACO3----- heat-----calcium oxide
10. What type of reaction is this? Thermal decomposition.
11. What are the products of this reaction? Quicklime and co2
12. What is slaked lime? Calcium hydroxide-is created when quicklime reacts with water.
13. What are the uses of the products of limestone? Slaked lime- used to reduce the acidity of soil.
14. What is an ore? And a low grade ore? A rock which has enough metal in it worth extracting. A low
grade ore is a rock which does not have enough metal in it worth extracting.
15. Name the ways we can extract metals from their ores? Reduction reaction, smelting and electrolysis.
16. How does the reactivity of a metal affect the way in which it is extracted? A more reactive metal will
displace a metal from its compound, so if one needs to extract the most reactive, they would have
to use methods like electrolysis.
17. Describe how iron is extracted in blast furnace? ­list all the raw materials needed. Haematite, coke
and limestone-hot air is blown into the blast furnace, this makes the coke burn which then heats the
furnace and forms CO2, at high temperatures, the CO2reacts again with the coke to form carbon
monoxide gas, the carbon monoxide then reacts with the iron oxide, removing its oxygen and
reducing it to molten iron. This flows to the bottom of the blast furnace.
18. How are the impurities removed from the blast furnace? With the use of limestone.

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19. Why is pure iron soft? The atoms arranged in pure iron are in layer so they can slide over each other
easily, this, makes it soft and easily shaped.
20. What is an alloy? An alloy is a metal that contains other elements.
21. Describe how the structure of a pure metal is distorted when it becomes an alloy? In alloys the layers
cannot slide over each other as easily as atoms have changed their original structure.
22.…read more

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37. What is a mixture? Crude oil is a mixture of many compounds; most of the compounds consist of
molecules made up of carbon and hydrogen-hydrocarbons.
38. What are hydrocarbons? Molecules made up of carbon and hydrogen.
39. What is the difference between alkanes and alkenes? Alkanes are single bonded carbon to carbon
molecules- saturated. Alkenes are double bonded carbon to carbon molecules- unsaturated.
40. How is crude oil separated? Factional distillation.
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52. What is the difference between saturated and unsaturated molecule? Saturated hydrocarbon cannot
bond with compounds anymore; whereas unsaturated hydrocarbons can bond, as they contain
double or triple bonds.
53. How in the lab can we test to see which is unsaturated? Bromine water is used to test for the
presence of double bonds.
54. How can plant fuels be used as fuels? Bio diesel is a fuel made from veg oil.…read more

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67. What is the structure of the earth? The earth is nearly spherical; it has a layered structure that
consists of a thin crust, mantle and a core.
68. How does the crust move? The crust moves around the mantle, natural radioactive processes in the
mantle cause heat to be given off, these form convection currents causing the tectonic plates to
move over the surface of the earth.
69. What is the air made up of? -% Nitrogen 78% CO2 0.…read more


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