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new C2 page

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im doing the 4th past paper, on 3iv would you just explain about limewater?? then with co2 making it cloudy??

test would be to bubble both gases through limewater. time how long it takes for both the inhaled and exhaled air to turn the

limewater milky. I would predict that the exhaled air would do this the fastest due to there being more CO2

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Make sure you drag the page width and height to see any comments Ive made the page bigger

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Make sure you drag the page width and height to see any comments Ive made the page bigger

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in booklet 1 the alkali metals boiling points decrease but I thought they had high boiling points ?

Most metals have high boiling/melting points thats one property of a metal. However group 1 metals

are the exception, they have low melting/boiling points because they are very reactive. Just make sure

you are able to look at information from a table of results/data and draw your own conclusion.

Thankyou

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Hey, right is the definition of a polymer - every plastic is a polymer? And if a monomers double bond breaks to make plastics, is this a polymer?

a polymer is a plastic yes.

when monomers react and join together like you said it makes a polymer yes

Polymerisation - this is when many reactive monomers react together to form a long chain polymer (need high temperatures and a catalyst) The process of making a plastic.

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why do we heat 1/3 of the water during titration ?

otherwise it will take a long time to obtain the dry crystals

thank you

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Will fluoridation come up on the exam?

maybe - know advantages/disadvantages

why it is an ethical matter, how they carry out their research etc

Thank youuuuuuuuuuu^.^

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Could neutralisation come up as a QWC  ?

possible - would ask you to describe a titration reaction

Thank you

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Can we use that a disadvantage of hydrogen as a fuel is that it's very expensive because of the amount of electricity used to produce it 

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Can we use that a disadvantage of hydrogen as a fuel is that it's very expensive because of the amount of electricity used to produce it 

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its difficult - some times wjec has given a mark for this - my advice is to only add this if you cant remember the rest fuel - not many petrol stations stock it, have to fill car more often, difficult to store - explosive

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do we need to know how nitrogen causes acid rain or is it just sulfur??

know process of sulfur but be aware that nitrogen also causes acid rain.

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what group is hydrogen in?

Hydrogen doesnt belong to any group

its found in period 1.

thanks

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could we be asked a qwc on alloys, copper or titanium?

Might - but it would be relating its properties to its uses

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do we need to now the meaning of a precipitate?

No - but for you its when 2 liquids react to make a solid!

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do we have to know how to do the circle atom diagram things :(!?

No all you need to know is that an atom has a positive nucleus, which

is surrounded by negative charged electrons (which are found in shells)

okay, fankyouu!:')

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what is the least likely QWC question to come up?

dont know probably the ones that have all ready been asked - check your past papers.

I predict:

advant/dis and uses of plastics

electrolysis of Al2O3

Advant/dis of hydrogen as a fuel

nanoscience

the development of plate tectonics

properties and uses of metals

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Why is electrolysis used to extract aluminium from its oxide?

Because heating it with carbon will have no effect because aluminium is

more reactive than carbon. This goes for any extraction if a metal is above

carbon in the reactivity series.

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when reacting metals and acids to make salts do you have to heat? for example magnesium sulfate crystals, copper sulfate crystals, sodium chloride crystals, and when reacting carbonates with acids?  Only heat if using copper oxide - all metals react with acid if they are higher than hydrogen in the reactivity series.

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there's two marks for 'what makes the results reliable' what is the other mark for - except from repeating?!

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there's two marks for 'what makes the results reliable' what is the other mark for - except from repeating?!

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You must then look to see if the results are similiar

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in the paper from today it asks 'state how molecules of oxygen are formed
at the graphite anode..what would the answer be?
2O2- -4e --> O2 ( sorry i cant make the numbers small)

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Whats the percentage of co2 and noble gases in the air?

Carbon Dioxide- 0.04%

Noble Gases- Less than 1 (0.93)

Thank you

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Just practise i cant tell you this on here look on bbc bitesize/youtube

to difficult to explain typing

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what is a unsaturated hydrocarbon?

A hydrocarbon with a double carbon to carbon bond

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when writing a qwc, can we put chemical formula rather than words to save time, or will we loose marks??

Only if your formulae are correct otherwise youll lose marks!

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What is the practical for the QWC, "3 white solids,

Sodium chloride, sodium carbonate and sodium hydroxide....

Use hydrochloric acid to identify them"

Test 1 - add acid

NaCO3 - youll see a temperature rise and bubbles.

NaOH youll see a temperature rise

NaCl there will be no change/no reaction

Test 2 - Add universal indicator

NaCO3 - will turn blue

NaOH - will turn purple

NaCl - will turn green

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Do we need to know the equations for the iron extraction, ' iron oxide+carbon monoxide-iron+carbon dioxide

know the process of what happens to the carbon - but you

do need to know the equation you quoted above in both word

and balanced symbol equation.

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after the exam tomorrow can we come and see you

Really - yes if you want to .... i might hide lol

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In the last booklet, how do you know which of the reactions need to be heated

Its only the copper oxide and acid practical that needs to be heated!

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What type of cancer is caused by the fluoridation of water sources ? Is it bone cancer or stomach cancer ?

both of them. Thankyouu :)

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When a large hydrocarbon that is no use is cracked into smaller

useful hydrocarbons. Conditions needed are heat and a

catalyst.

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How do you find the number of protons, neutrons ans electrons present in an atom?

You dont need to know this for this exam that is year 11 work.

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It is a mixture of many different

length hydrocarbons - look at your past

papers see the different chain lengths in the

table - crude oil is made up of all of those hence

why it is a complex mixture

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A substance that can neutralise an acid