Chemistry

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What is the process to make crude oil ?
Hydrocarbon mixture is evaporated and then sperated by fractional distilation
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Name two things to describe an Alkane and what is it's general formula ?
single bond, saturated, CnH2n+2
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small alkAne molecules can be used as fuel because....
they burn well
3 of 26
AlkEne's cannot be burnt easily and have to be broken down, what is this process called ?
cracking
4 of 26
A polymer is lots of......
monomers
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when lithium is burn it produces a __________ flame.
red
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when sodium is burnt it produces a ________ flame.
yellow-orange
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when potassium is burnt it produces a ________ flame.
lilac
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sedimentation does what ?
removes large pieces of rock from water
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filtration does what ?
removes small particles from water
10 of 26
soft water takes a ______ amount of soap to create a ______.
small, lather
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chlorination does what ?
kills bacteria
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harm water forms what?
limescale
13 of 26
3 advatages of hard water. ?
tastes better, prevents heart disease, improves bone structure
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how can you remove ions from temporary hard water?
boiling
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how can you remove ions from perminante hard water ?
using an ion exchange collumn
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describe the structure of a metal.
tightly packed together in a regular structure
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what are allotropes ?
when an element has more than one form
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what is covelent bonding ?
electrons that are lost or gained so an atom gets a full outer shell
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Li looses an electron, what is its charge ?
Li +1
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What is the relative atomic mass (Ar) ?
top number or an element
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What is the relative molecular mass (Mr) ?
mass of all molecules addes together
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What is the (Mr) of Ca(OH)2 ? (include Ar and calculation)
ca=40, 0=16, H=1, 40+(16x2)+(1x2)=74
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formula to find out the (Mr) ?
%mass= Ar of element/ Mr of molecule
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what is activation energy ?
the energy needed for a reaction to happen
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WJEC question - Expalin in a methodical order the process of fractional distilation.
The crude oil is heated as it enters a fractional distilation collumn. When the temperature approaches boiling point, some hydrocarbons evaporate, the vapour will rise away from the heat. The frations remove impurities.
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Other cards in this set

Card 2

Front

Name two things to describe an Alkane and what is it's general formula ?

Back

single bond, saturated, CnH2n+2

Card 3

Front

small alkAne molecules can be used as fuel because....

Back

Preview of the front of card 3

Card 4

Front

AlkEne's cannot be burnt easily and have to be broken down, what is this process called ?

Back

Preview of the front of card 4

Card 5

Front

A polymer is lots of......

Back

Preview of the front of card 5
View more cards

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