Flashcards
AQA Chemistry Unit One Crude Oil
Flashcards do conjunto (12)
- 1What is crude oil?A mixture of hydrocarbons (mainly saturated hydrocarbons called alkanes)
- 2What is a mixturetwo or more elements or compounds that are not chemically bonded so the chemical properties of each substance of the mixture remains unchanged and so it can be separated physically
- 3What is the general formula and structure of alkanes?CnH2n+2
- 4Describe the process of fractional distillation-Heat so most vaporise
-put them into the column
-Vapours rise and cool
- condense off at their separate boiling points
-Low boiling points at the top
-Gathered at their boiling points and carried away in pipes - 5What are the properties of long hydrocarbons? and short hydrocarbons?Long hydrocarbons:
-Viscous
-High boiling point
-Not very flammable
Short hydrocarbons are vice versa - 6What do most fuels (including coal) contain?Most fuels contain carbon, hydrogen and sometimes sulfur
- 7What happens during combustion?The carbon and hydrogen get oxidised which releases energy
- 8What gases are released by combustion? What do these gases cause?-CO2 causes global warming
-Sulphur dioxide causes acid rain
-Oxides of nitrogen cause acid rain
-Carbon monoxide is a toxic gas
-Particulates cause global dimming - 9When are oxides of nitrogen and particulates formed?-Oxides of nitrogen are formed at high temperatures
-Particulates are formed by incomplete combustion of carbon (e.g. soot) - 10When is sulphur removed?-Can be removed before fuel is burnt, e.g. in cars
-Can also be removed from the waste gases after combustion, e.g. in power stations - 11What are biofuels made from?plant material
- 12Give two examples of biofuelsmethane and ethanol
Informações
- Descrição
- Flashcards on all of C1.4 (Crude Oil). They're taken directly from the specification so should be everything that you need =)
- Criado por
- Natalia Cliff
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