chemistry

  • Created by: Dymphna
  • Created on: 16-04-13 21:16
what is the structure of an atom?
a small nucleus surrounded by electrons.
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what is an element?
a substance made up of only one type of atom.
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approx. how many elements are there?
100
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where can you find the elements?
periodic table.
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how are elements grouped?
by their properties.
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what is a compund?
a substance sontaining more than one element.
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what are the environmental effects of quarrying limestone?
dust, noise, loss of wildlife habbitats
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what are the social effects of quarrying limestone?
traffic, improved roads
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what are the economic effects of quarrying limestone?
employment, trade for business
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how is limestone used to make cement?
limestone mixed with clay and heated in kiln. ground to fine powder
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how is limestone used to make concrete?
add aggregate to cement, sand and water.
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how is limestone used to make glass?
limestone heated with sand and soda(sodium carbonate)
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what is calcium carbonate commonly known as?
limestone
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what is thermal decomposition of calcium carbonate?
when heated it decomposes to make calcium oxide and carbon dioxide.
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what is quicklime?
calcium oxide
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what is slaked lime?
calcium hydroxide.
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how is the lime kiln used?
reduces calcium carbonate to lime.
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what are alloys?
mixtures of metals.
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what are ores?
rock which contains enough metal to be extracted from.
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what unreactive metals are found in earth as metal?
gold.
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how is the blast furnace used to make iron?
iron is reduced at high temperatures in a blast furnace using carbon.
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what are the properties of pure iron?
soft
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how is steel made?
it is added to iron and carbon.
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where on the periodic table are the transition metals?
middle.
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what process is used to extract copper?
smelting
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what properties do titanium and aluminium have?
low density, resistant to corrosion,
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what is used to extract aluminium?
molten aluminium oxide.
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why is extracting aluminium expensive?
requires high temperature and electricity
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what are hydrocarbons?
compound containing hydrogen and carbon.
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what is crude oil?
a mixture of many different compunds which can be separated by heating.
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how does fractional distillation work?
compounds evapourating at different temperatures.
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what is an alkane?
saturated hydrocarbon.
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what is the general formula for an alkane?
cnh2n+2
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what is an alkene?
unsaturated hydrocarbon
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what is the general formula for an alkene?
cnh2n
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what 3 gases can be released when a fuel burns?
carbon monoxide, sulfur dioxide, nitrogen oxide
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how is acid rain made?
carbon dioxide in the air dissolves in rain water.
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Other cards in this set

Card 2

Front

what is an element?

Back

a substance made up of only one type of atom.

Card 3

Front

approx. how many elements are there?

Back

Preview of the front of card 3

Card 4

Front

where can you find the elements?

Back

Preview of the front of card 4

Card 5

Front

how are elements grouped?

Back

Preview of the front of card 5
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