C3 edexcel june 2016 unofficial mark scheme

OP

The answer for the tick boxes for question one was A then D

Reply 2

Last six marker, the order was Ethene, Ethanol, Ethanoic Acid and Ethane

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Reply 3

did you have to specify that it was Ethene, Ethanol, Ethanoic Acid and Ethane or could you have just written Alkene, Alcohol, Carboxylic acid Acid and Alkane

Reply 4

TSR778899

9

Original post by harry_16

Last six marker, the order was Ethene, Ethanol, Ethanoic Acid and Ethane

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what did you put for the explanattions for the first colemn? I spoke about the general formulas and the functional groups for the reasons they contained certain atoms.

Reply 5

I spoke about how because it turned bromine water orange

Reply 6

sorry orange to colourless

Reply 7

and because the alkane remained orange

Reply 8

OP

What causes the solution to turn alkaline?

Reply 9

Yeah, you had to specify because the question told you the names of the substances in the wrong order.

I wrote about the fact that Ethene is a hydrocarbon which contains only hydrogen and carbon atoms and the fact that it turned bromine water colourless because it's an unsaturated alkene. I also said that alkenes are used in polymerisation reactions :smile:

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Reply 10

I said that Hydroxide ions made it alkaline.

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Reply 11

Moon.idk

1) hard water
Multiple choice:
A
D

Question: what method removes hardness in both temporary and permanent hard water?
Using exchange resin for temporary and permanent hard water. Exchanges calcium and magnesium Ions in hard water for sodium and hydrogen ions in resin.

What are the disadvantages of having hard water in your tap?
Doesn't form a lather easily therefore lots of soap is wasted to form the lather. Can be expensive? Forms Scum when reacting with soap.

Reply 12

glowanti

14

Original post by Moon.idk

1) hard water
Multiple choice:
A
D

Question: what method removes hardness in both temporary and permanent hard water?
Using exchange resin for temporary and permanent hard water. Exchanges calcium and magnesium Ions in hard water for sodium and hydrogen ions in resin.

What are the disadvantages of having hard water in your tap?
Doesn't form a lather easily therefore lots of soap is wasted to form the lather. Can be expensive? Forms Scum when reacting with soap.

i also said as a disadvantage that it would form limescale in pipes for radiators etc which will build up, decrease the amount of water able to go through and therefore increase energy prices

Reply 13

Emilysarahxox

7

Original post by caitlinford3

i also said as a disadvantage that it would form limescale in pipes for radiators etc which will build up, decrease the amount of water able to go through and therefore increase energy prices

I also said that :smile:

Reply 14

OP

Original post by harry_16

I said that Hydroxide ions made it alkaline.

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I wrote nitrogen hydroxide, would i get a mark?

Reply 15

Emilysarahxox

7

Original post by VjM

The answer for the tick boxes for question one was A then D

What were the questions for both multiple choice's?

Reply 16

I'm not sure whether or not you'd get the mark because it asked for an ion

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Reply 17

OP

Original post by Emilysarahxox

What were the questions for both multiple choice's?

I think the one that gave the answer A was that 'which one is the soft water?' And I think for the D one it was 'which one only contained temporary hardness?'

Reply 18

OP