Chemistry c2 unit 2 aqa monday gcse 20th new spec

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I wrote about how you would react the magnesium ribbon with different % concentrations of the acid, I cant remember what it was :L and then measure the rate of reaction by measuring the amount of Hydrogen gas produced in a minute. For the fair test I said I would use the same sized piece of magnesium each time and repeat the experiment to make it reliable and detect anomalies.
Then I did a risk assessment. Basically I just wrote anything I could think of that might have some relevance to the question... :smile:

Ah.. I messed up on that question. Instead of writing the amount of hydrogen produced, I said you should use a timer to time how long it takes for the reaction to stop fizzing. I spoke about the measurements needed (amount of acid, magnesium and a stopwatch to time the reacting). and how to keep the test fair by only changing the concentration. I also stated what the independent and dependent variables were. :s-smilie:

Ah, well I think I did pretty well in the other questions so it should make up for it.

What did you say for the two observations the students could make?

Reply 81

LjWol

Original post by 9examsleft

Did anyone put endothermic as the first question? 1b or 1ai < can't remember

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i think i put exothermic... however thinking back it probably was endothermic :') lol! only one mark though :rolleyes:

Reply 82

Elm Tree

Original post by 9examsleft

Did anyone put endothermic as the first question? 1b or 1ai < can't remember

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Yeah I put endothermic, the second question right?

Reply 83

denyswilcox_

Easy. Gonna be high grade boundaries

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Reply 84

subjunctivehistorian

Original post by Elm Tree

Ah, well I think I did pretty well in the other questions so it should make up for it.

What did you say for the two observations the students could make?

That sounds about right, I'd say you'd only drop one mark at most! I said they could observe whether it fizzed or not, and whether it heated up, but I'm worried that counts as the same thing... What did you put? :s-smilie:

Reply 85

Elm Tree

Original post by ZeniB

I wrote the same things :smile:

And they shouldn't count as the same thing :biggrin:

Reply 86

9examsleft

What was the carbon dioxide question?
What was the answer to the question about the Jon used to make the solution alkali and the acidic one?

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Reply 87

LjWol

Original post by denyswilcox_

Easy. Gonna be high grade boundaries

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Yeahh, i think so too :rolleyes:

what did everyone find hardest? I thought the 6 marker was random but easy enough - more like an ISA! :') some of my friends got really carried away and starting listing what they used and made risk assessment tables :') It was just about explaining the experiment through either the change in mass method, or gas syringe method, and then saying what you'd do to keep it fair e,g, same amount of hcl and same type of metal.. maybe. Then you just had to state what you measured depending on the method you chose it was very much common sense in my opinion.

For the half equation one did everyone put 2, and 2e- in the gaps??

Reply 88

9examsleft

Original post by LjWol

Yeahh, i think so too :rolleyes:

Yes for the half equation :biggrin:

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Reply 89

LjWol

Original post by 9examsleft

What was the carbon dioxide question?
What was the answer to the question about the Jon used to make the solution alkali and the acidic one?

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Not surre, but i think the answer your looking for it might be H+ for the acidic and OH- for the alkali but i can't exactly remember the question- could it have been where neutralisation was the answer??

Reply 90

moodavies106

I did to for the Half equation also for the carbon atoms structure one did people say that it is a simple molecular compound with weak I'm forces in between the molecules but strong covalent bonds between the atoms

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Reply 91

LjWol

Original post by 9examsleft

Yes for the half equation :biggrin:

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Wohoooo!

Reply 92

LjWol

Original post by moodavies106

no i think it was giant covalent :confused:

Reply 93

moodavies106

I had no clue I just guessed simple molecular compounds because they are gases

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Reply 94

9examsleft

Original post by LjWol

Yesssssss!!!! Thank you stress over!

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Reply 95

Elm Tree

Original post by moodavies106

That's pretty much what I put

>Simple Molecule
>Weak IM forces of attraction
>Little energy needed to overcome forces
:smile:

Reply 96

LjWol

Original post by moodavies106

I had no clue I just guessed simple molecular compounds because they are gases

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lol

i think you might get a mark for mentioning the strong covalent bonds, but i think it was looking for you to say that each carbon atom had four hydrogen atoms, and then to state the properties of giant covalent structures(macromolecules) wait.. you are talking about the drill tip one right? :')

(edited 10 years ago)

Reply 97

Simpliey

What did everyone put the cake icing, I put because of Co2 the cake was raised, for the calculating masses i put something like 6.4, percentage yield was something like 61%??