one which gives out heat energy to the surroundings
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what is an exothermic reaction?
one which takes in heat energy from the surroundings
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what is crude oil?
complex mixture of any different hydrocarbons
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what is a hydrocarbon?
molecule that is formed from hydrogen and carbon atoms only
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what is a homologous series?
family of molecules which have the same general formula
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what is the equation for the complete combustion of hydrocarbons/
hydrocarbon+oxygen-->carbon dioxide+water
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when does incomplete combustion happen?
when you burn hydrocarbons when there is insufficient oxygen in the air
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what are the dangers of carbon monoxide?
it can combine with red blood cells and stop your body from doing its proper job of carrying oxygen around the body
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what is soot?
tiny particles released into the atmosphere during incomplete combustion. when they fall back to the ground they deposit themselves as the black dust (soot)
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what are the dangers of sulfur dioxide?
when it mixes with the water in the clouds, it forms dilute sulfuric acid which then falls as acid rain
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what are the dangers of acid rain?
it causes lakes to become acidic and many plants and animals die as a result. it also kills trees, damages limestone buildings and ruins some stone statues. it can also make metals corrode
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what are the dangers of nitrogen oxide?
can contribute to acid rain and can cause photo chemical smog-type of pollution that can cause breathing difficulties, headaches and tiredness.
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what are the advantages of using hydrogen as a fuel?
it is a very clean fuel and it is a renewable resource
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what are the disadvantages of using hydrogen as a fuel?
a very expensive engine is required and it is a highly flammable gas
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what is cracking?
when longer saturated hydrocarbons produced from fractional distillation are turned into smaller more useful ones- it is a thermal decomposition reaction
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how is carbon dioxide decreased?
absorption by the oceans and absorption by plants and algae
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how is oxygen increased?
photosynthesis
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how to test for oxygen?
put a glowing splint in a test tube containing the gas and if oxygen is present, it will relight the splint
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how does human activity and greenhouse gases relate?
increasing energy consumption, deforestation and methane and farming
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Other cards in this set
Card 2
Front
what is an exothermic reaction?
Back
one which takes in heat energy from the surroundings
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