Chemistry Complete Revision

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  • Created by: AshLaufey
  • Created on: 17-11-15 19:00
What are hydrocarbons?
A compound containing only hydrogen and carbon
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Name 4 examples of hydrocarbons
Any from: Methane, Ethane, Propane, Butane, Pentane, Hectane etc
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What is the general formula for alkanes?
CnH(2n+2)
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Alkanes are unsaturated hydrocarbons. True or False?
False, they are saturated hydrocarbons
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What is crude oil?
A dark, pungent liquid. It is a mixture of many different compounds, many of which are hydrocarbons.
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What is the main way of separating hydrocarbons from crude oil?
Distillation
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What kind of hydrocarbons are found at 50 degrees?
Short chain hydrocarbons e.g refinery/petroleum gas and low boiling point alkanes.
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Balance this equation: C3H8 + O2 --> CO2 + H2O
C3H8 + 5O2 --> 3CO2 + H2O
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Name 3 disadvantages of burning fuels
Climate change caused by greenhouse gases (carbon dioxide), incomplete combustion causes deadly carbon monoxide. reaction makes nitrogen oxide which is toxic and is the cause of acid rain. Small parts of unburnt hydrocarbons cause global dimming
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What are biofuels?
A fuel made from plant or animal products
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Name 2 advantages of biofuels
Any from: Less harmful to animals if spilled, Burns cleaner, is cheaper than crude fuels, the crops used to make biofuels absorb carbon dioxide as they grow (they are carbon dioxide neutral)
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Name 2 disadvantages of biofuels
If biofuels were the main fuel then many of the old crop farmland, could cause famine in more countries, animals and plants dying out during to their natural habitats being destroyed for farmland to grow biofuel crops
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What is the word equation for the decomposition of glucose?
glucose --> ethanol + carbon dioxide
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What is the word chemical equation for the decomposition of glucose?
C6H12O6 + 2C2H5OH + 2CO2
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What is the chemical equation for burning ethanol?
C2H5OH + 3O2 --> 2CO2 + 3H2O
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What is electrolysis?
The breakdown of a substance containing ions by electricity
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What is an electrode?
A conductor rod in the electrolysis circuit
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What an anode?
The positive electrode
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What is a cathode?
The negative electrode
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What is OILRIG
Oxidation is loss, Reduction is gain
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What is the correct order of the reactivity series
Potassium, Sodium, Calcium, Magnesium, Aluminium, Carbon, Zinc, Iron, Tin, Lead, Hydrogen, Copper, Silver, Gold, Platinium
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What is the flame test colour for lithium
Crimson
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What is the flame test colour for sodium
Yellow
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What is the flame test colour for potassium
Lilac
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What is the flame test colour for calcium
Brick Red
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What is the flame test colour for barium
Apple Green
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How do you work out the Rf value in chromatography
The distance the substance travels divided by the distance the solvent travels
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How do you do a halide test
Add nitric acid to dissolve the compound, then add silver nitrate solution. If a precipitate forms there are halide ions present.
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What is the colour of the precipitate formed when chloride is present in the halide test
White
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What is the colour of the precipitate formed when bromide is present in the halide test
Cream
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What is the colour of the precipitate formed when Iodide is present in the halide test
Pale Yellow.
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Other cards in this set

Card 2

Front

Name 4 examples of hydrocarbons

Back

Any from: Methane, Ethane, Propane, Butane, Pentane, Hectane etc

Card 3

Front

What is the general formula for alkanes?

Back

Preview of the front of card 3

Card 4

Front

Alkanes are unsaturated hydrocarbons. True or False?

Back

Preview of the front of card 4

Card 5

Front

What is crude oil?

Back

Preview of the front of card 5
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