what two waste products form from the complete combustion of hydrocarbons
carbon dioxide and water vapour Hydrogen + oxygen = carbon dioxide + water
3 of 18
how is crude oil formed?
crude oil is a fossil fuel. its formed from the remains of plants and animals, mainly plankton, that died and buried in mud. With high temp and pressure the remains turn to crude oil which are drilled up from rocks where its found
4 of 18
where are the shortest carbon chains found in the fractional distillation column
shorter carbon chains have lower boiling points. they condense and drain out much later on , near the top where its cooler
5 of 18
give three products that can be made form crude oil
petrol for cars, kerosene for planes, diesel oil for trucks, heavy fuel oil and liquefied petroleum gas
6 of 18
why is cracking used?
cracking is a thermal decomposition reaction - breaking molecules down by heating them. It breaks down long chain hydrocarbons to make them more useful
7 of 18
give a product of cracking that is useful for making plastic
cracking produces alkenes which are a starting material when making polymers, or plastic
8 of 18
what is a formulation?
formulations are mixtures with a precise purpose that are made by following a 'formula' or recipe. each component is present in a measured quantity and contributes to the properties of the formulation to meet its required function
9 of 18
what is used to test for alkanes?
bromine water: when orange bromine water is added to an alkAne no reaction will happen an it'll stay bright orange. If its added to an alkEne the bromine makes a colourless compound
10 of 18
what are the two phases in chromotograpghy called?
A mobile phase where the molecules can move. liquid or gas. A stationary phases where the molecules can't move. solid or thick liquid
11 of 18
in paper chromotagrpaghy how many spots will a pure substance form on the paper?
One spot as there is only one substance in the sample
12 of 18
give the formula for working out the Rf value of a substance
Rf = distance travelled by substance (B) % distance travelled by solvent (A)
13 of 18
would you expect the Rf value of a substance to change if you changed the solvent used in the chromatography experiment
if you change the solvent the Rf value for a substance will change.
14 of 18
how do you test for cholrine?
chlorine clenches damp litmus paper
15 of 18
how do u test for oxygen?
the oxygen will relight a glowing splint
16 of 18
how do u test for carbon dioxide/
turns limewater (calcium hydroxide) cloudy
17 of 18
how do you test for hydrogen?
hold a lit splint act the end of a test tube it burns with a squeaky pop
18 of 18
Other cards in this set
Card 2
Front
what is the general formula for alkanes
Back
CnH2n+2
Card 3
Front
what two waste products form from the complete combustion of hydrocarbons
Back
Card 4
Front
how is crude oil formed?
Back
Card 5
Front
where are the shortest carbon chains found in the fractional distillation column
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