[Hollykins]

(Original post by kman123456)
Wow, i did 2/28= Ans x 34 = 2.42857.... And i wrote 2.42 as my answer not 2.43... Would i get the full 3 marks?

I did this too! Do you think it will be okay?

[maxtate]

(Original post by LibbyloolaP)
i think a lot of questions have been asked about crystallization/evaporation, but i think both would be fine-- in paper from jan 2011 it says

crystallization
or
evaporation / heating / boiling /
cooling when it refers to separating magnesium sulfate from solution so i think both answers would be accepted
accept detailed answers such as:
evaporate to half volume and then
allow the solution to crystallise.
ignore any references to filter

SOO in the end first one FILTRATION and second one EVAPORATION??

[LibbyloolaP]

(Original post by maxtate)
SOO in the end first one FILTRATION and second one EVAPORATION??

first one filtration second one evaporation or crystallization - I'm sure both are fine

[charlie279]

(Original post by maxtate)
SOO in the end first one FILTRATION and second one EVAPORATION??

Yes


This was posted from The Student Room's iPhone/iPad App

[shippers123]

alot of you guys/girls here have done higher, but i'm ****e at Chemistry but did anyone actually do Foundation C2? hahah.

[MissGeek]

Here is an unofficial mark scheme of all the questions and answers I can remember. I do apologise in advance if the questions are not worded in the correct order, or if the order confuses you.

Why are chloride ions attracted to the positive electrode? (1)
Opposite charges attract/chloride ions have a negative charge
I can't remember, I think it was something on ions, or alkalis? (1)
Why is hydrogen formed? (1)
Hydrogen is less reactive than sodium
Draw the diagram (Hydrogen and Chlorine) (I THINK) (1)
Both must have a full outer shell.
What type of bonding is it? (1)
Covalent

What type of ions make the solution pH 1? (1)
Hydrogen

What type of ions make the solution alkali? (1)
Hydroxide

Calculate the number of ? in 1 mol^3 of ? (gas canister question) (1)
I did 53.? - 51.? (I don't know if this is right though)

Calculate the mean mass of gas results. (2)
Miss out anomaly to get answer, however, if you showed your workings, you could still get 1 mark.

Suggest 2 causes of this experimental error (2)
I put weighing error in measuring gas canister, human error, recording error, may have been a systematic error (unsure, please correct me if I'm wrong)

Why should they repeat the test more (1)
Make it more reliable
Allows them to spot any anomalies
Allows them to calculate a mean/average

What type of acid makes the magnesium hyrdoxide react to form calcium chloride? (1)
Hydrochloric acid

Explain how the magnesium hydroxide (I think) can be separated from the calcium chloride. (1)
I can't remember what I put.

Suggest how the calcium chloride can be made into a solid? (1)
Evaporation

What is oxidation? (1)
Electrons are lost.

Explain why the best yield is produced when the pressure is higher (1)
There are more (gaseous) reactant molecules than (gaseous) product molecules.

Explain why, in terms of particles, the rate of reaction increases when temperature increases. (2)
The particles gain energy, they move faster and collide more frequently.

Explain why the pressure is not higher than 200 atmospheres in the Haber process (1)
It would be more expensive.

Explain why a temperature of 450 is suitable (can't remember exactly how it was worded) (1)
The forward reaction is exothermic

Explain why it doesn't matter if a low yield of ammonia is produced in the Haber process (2)
The unreacted hydrogen and nitrogen are reacycled and can be used and reacted again to form ammonia again.
The reaction is reversible.


Calculate the mass of ammonia that can be made from 2g of nitrogen (3)
2.4g (1 d.p.)

In Haber Process, a maximum of 80kg can be produced. 12 kg is produced. Calculate the percentage yield. (2)
15%

Diamond is hard. Explain why it is hard, refer to structure and properties in your answer (3)
Each carbon atom is covalently bonded to 4 other carbon atoms. The bonds are strong and a lot of energy is required to break the bonds. There are no delocalised electrons in diamond due to each carbon atom being covalently bonded to 4 other carbon atoms.

Calculate the relative formula mass of C3H8. C=12, H=8 (2)
44g

Explain the structure of gold. (3)
There is metallic bonding in gold. There are fixed positive ions and delocalised electrons which are free to move around. There are electrostatic forces of attraction between the electrons and positive ions.

Explain why gold is a good conductor of electricity (1)
It has delocalised electrons

[shippers123]

so who did foundation here?

[MissGeek]

(Original post by R.P.Everything.)
Some of the questions I can remember:

1a) Why do chloride ions move to the positive electrode:
- They are negatively charged/electrostatic force of attraction.
1b) What ion causes the solution to be alkaline?
- Hydroxide
1c) Draw a covalent bond for HCl
Attachment 150951
1d) What ion causes a drop in pH
- Hydrogen ions.

If someone could kindly post the questions, I will help contribute to an unofficial mark scheme.

Here are most of the questions from the unofficial markscheme I created to help you, I think this mark scheme may need a little bit of finishing off.

Why are chloride ions attracted to the positive electrode? (1)
Opposite charges attract/chloride ions have a negative charge
I can't remember, I think it was something on ions, or alkalis? (1)
Why is hydrogen formed? (1)
Hydrogen is less reactive than sodium
Draw the diagram (Hydrogen and Chlorine) (I THINK) (1)
Both must have a full outer shell.
What type of bonding is it? (1)
Covalent

What type of ions make the solution pH 1? (1)
Hydrogen

What type of ions make the solution alkali? (1)
Hydroxide

Calculate the number of ? in 1 mol^3 of ? (gas canister question) (1)
I did 53.? - 51.? (I don't know if this is right though)

Calculate the mean mass of gas results. (2)
Miss out anomaly to get answer, however, if you showed your workings, you could still get 1 mark.

Suggest 2 causes of this experimental error (2)
I put weighing error in measuring gas canister, human error, recording error, may have been a systematic error (unsure, please correct me if I'm wrong)

Why should they repeat the test more (1)
Make it more reliable
Allows them to spot any anomalies
Allows them to calculate a mean/average

What type of acid makes the magnesium hyrdoxide react to form calcium chloride? (1)
Hydrochloric acid

Explain how the magnesium hydroxide (I think) can be separated from the calcium chloride. (1)
I can't remember what I put.

Suggest how the calcium chloride can be made into a solid? (1)
Evaporation

What is oxidation? (1)
Electrons are lost.

Explain why the best yield is produced when the pressure is higher (1)
There are more (gaseous) reactant molecules than (gaseous) product molecules.

Explain why, in terms of particles, the rate of reaction increases when temperature increases. (2)
The particles gain energy, they move faster and collide more frequently.

Explain why the pressure is not higher than 200 atmospheres in the Haber process (1)
It would be more expensive.

Explain why a temperature of 450 is suitable (can't remember exactly how it was worded) (1)
The forward reaction is exothermic

Explain why it doesn't matter if a low yield of ammonia is produced in the Haber process (2)
The unreacted hydrogen and nitrogen are reacycled and can be used and reacted again to form ammonia again.
The reaction is reversible.


Calculate the mass of ammonia that can be made from 2g of nitrogen (3)
2.4g (1 d.p.)

In Haber Process, a maximum of 80kg can be produced. 12 kg is produced. Calculate the percentage yield. (2)
15%

Diamond is hard. Explain why it is hard, refer to structure and properties in your answer (3)
Each carbon atom is covalently bonded to 4 other carbon atoms. The bonds are strong and a lot of energy is required to break the bonds. There are no delocalised electrons in diamond due to each carbon atom being covalently bonded to 4 other carbon atoms.

Calculate the relative formula mass of C3H8. C=12, H=8 (2)
44g

Explain the structure of gold. (3)
There is metallic bonding in gold. There are fixed positive ions and delocalised electrons which are free to move around. There are electrostatic forces of attraction between the electrons and positive ions.

Explain why gold is a good conductor of electricity (1)
It has delocalised electrons

[xoxlovelifexox]

(Original post by Blue_Clover)
Not at all! I pretty much wrote electrolysis for every question I didn't know the answer to (practically half the exam -_-). How was yours?

it was okay, i mean you can never be certain on your performance but all you can do is hope for the best i did C2 and C3 today and like there were moments where i was like yes i know this but i know i have made a couple of silly mistakes already all i can say to you, or anyone really, is something you do much better than you think!

[SlayerOfTheHero]

^ sums most of it up, the last question not included:
"Something to do with why metals are less efficient in their conductivity of charge when corroded because of exposure to open air"? (2)

I put something like, reacts with something in the air forming and ionic compound which fixes the electrons in the lattice, thus hindering the ability to carry charge.

Other than that good job MissGeek.

My realistic thoughts for the grade boundaries:

A* - 37
A - 33
B - 28
C - 23
D - 18

[khalidpatel]

i got 25 marks.. ANY idea what grade that could be?

[Sheel1]

(Original post by MissGeek)
Here is an unofficial mark scheme of all the questions and answers I can remember. I do apologise in advance if the questions are not worded in the correct order, or if the order confuses you.

Why are chloride ions attracted to the positive electrode? (1)
Opposite charges attract/chloride ions have a negative charge
I can't remember, I think it was something on ions, or alkalis? (1)
Why is hydrogen formed? (1)
Hydrogen is less reactive than sodium
Draw the diagram (Hydrogen and Chlorine) (I THINK) (1)
Both must have a full outer shell.
What type of bonding is it? (1)
Covalent

What type of ions make the solution pH 1? (1)
Hydrogen

What type of ions make the solution alkali? (1)
Hydroxide

Calculate the number of ? in 1 mol^3 of ? (gas canister question) (1)
I did 53.? - 51.? (I don't know if this is right though)

Calculate the mean mass of gas results. (2)
Miss out anomaly to get answer, however, if you showed your workings, you could still get 1 mark.

Suggest 2 causes of this experimental error (2)
I put weighing error in measuring gas canister, human error, recording error, may have been a systematic error (unsure, please correct me if I'm wrong)

Why should they repeat the test more (1)
Make it more reliable
Allows them to spot any anomalies
Allows them to calculate a mean/average

What type of acid makes the magnesium hyrdoxide react to form calcium chloride? (1)
Hydrochloric acid

Explain how the magnesium hydroxide (I think) can be separated from the calcium chloride. (1)
I can't remember what I put.

Suggest how the calcium chloride can be made into a solid? (1)
Evaporation

What is oxidation? (1)
Electrons are lost.

Explain why the best yield is produced when the pressure is higher (1)
There are more (gaseous) reactant molecules than (gaseous) product molecules.

Explain why, in terms of particles, the rate of reaction increases when temperature increases. (2)
The particles gain energy, they move faster and collide more frequently.

Explain why the pressure is not higher than 200 atmospheres in the Haber process (1)
It would be more expensive.

Explain why a temperature of 450 is suitable (can't remember exactly how it was worded) (1)
The forward reaction is exothermic

Explain why it doesn't matter if a low yield of ammonia is produced in the Haber process (2)
The unreacted hydrogen and nitrogen are reacycled and can be used and reacted again to form ammonia again.
The reaction is reversible.


Calculate the mass of ammonia that can be made from 2g of nitrogen (3)
2.4g (1 d.p.)

In Haber Process, a maximum of 80kg can be produced. 12 kg is produced. Calculate the percentage yield. (2)
15%

Diamond is hard. Explain why it is hard, refer to structure and properties in your answer (3)
Each carbon atom is covalently bonded to 4 other carbon atoms. The bonds are strong and a lot of energy is required to break the bonds. There are no delocalised electrons in diamond due to each carbon atom being covalently bonded to 4 other carbon atoms.

Calculate the relative formula mass of C3H8. C=12, H=8 (2)
44g

Explain the structure of gold. (3)
There is metallic bonding in gold. There are fixed positive ions and delocalised electrons which are free to move around. There are electrostatic forces of attraction between the electrons and positive ions.

Explain why gold is a good conductor of electricity (1)
It has delocalised electrons

I got about 20/45 ( Lowest and i hope it gets higher!) according to your mark scheme

[Chlomc]

(Original post by MissGeek)
Here is an unofficial mark scheme of all the questions and answers I can remember. I do apologise in advance if the questions are not worded in the correct order, or if the order confuses you.

Why are chloride ions attracted to the positive electrode? (1)
Opposite charges attract/chloride ions have a negative charge
I can't remember, I think it was something on ions, or alkalis? (1)
Why is hydrogen formed? (1)
Hydrogen is less reactive than sodium
Draw the diagram (Hydrogen and Chlorine) (I THINK) (1)
Both must have a full outer shell.
What type of bonding is it? (1)
Covalent

What type of ions make the solution pH 1? (1)
Hydrogen

What type of ions make the solution alkali? (1)
Hydroxide

Calculate the number of ? in 1 mol^3 of ? (gas canister question) (1)
I did 53.? - 51.? (I don't know if this is right though)

Calculate the mean mass of gas results. (2)
Miss out anomaly to get answer, however, if you showed your workings, you could still get 1 mark.

Suggest 2 causes of this experimental error (2)
I put weighing error in measuring gas canister, human error, recording error, may have been a systematic error (unsure, please correct me if I'm wrong)

Why should they repeat the test more (1)
Make it more reliable
Allows them to spot any anomalies
Allows them to calculate a mean/average

What type of acid makes the magnesium hyrdoxide react to form calcium chloride? (1)
Hydrochloric acid

Explain how the magnesium hydroxide (I think) can be separated from the calcium chloride. (1)
I can't remember what I put.

Suggest how the calcium chloride can be made into a solid? (1)
Evaporation

What is oxidation? (1)
Electrons are lost.

Explain why the best yield is produced when the pressure is higher (1)
There are more (gaseous) reactant molecules than (gaseous) product molecules.

Explain why, in terms of particles, the rate of reaction increases when temperature increases. (2)
The particles gain energy, they move faster and collide more frequently.

Explain why the pressure is not higher than 200 atmospheres in the Haber process (1)
It would be more expensive.

Explain why a temperature of 450 is suitable (can't remember exactly how it was worded) (1)
The forward reaction is exothermic

Explain why it doesn't matter if a low yield of ammonia is produced in the Haber process (2)
The unreacted hydrogen and nitrogen are reacycled and can be used and reacted again to form ammonia again.
The reaction is reversible.


Calculate the mass of ammonia that can be made from 2g of nitrogen (3)
2.4g (1 d.p.)

In Haber Process, a maximum of 80kg can be produced. 12 kg is produced. Calculate the percentage yield. (2)
15%

Diamond is hard. Explain why it is hard, refer to structure and properties in your answer (3)
Each carbon atom is covalently bonded to 4 other carbon atoms. The bonds are strong and a lot of energy is required to break the bonds. There are no delocalised electrons in diamond due to each carbon atom being covalently bonded to 4 other carbon atoms.

Calculate the relative formula mass of C3H8. C=12, H=8 (2)
44g

Explain the structure of gold. (3)
There is metallic bonding in gold. There are fixed positive ions and delocalised electrons which are free to move around. There are electrostatic forces of attraction between the electrons and positive ions.

Explain why gold is a good conductor of electricity (1)
It has delocalised electrons

Im pretty sure the "why is gold a good conductor was 2 marks and also theres the question about " iron corrodes when its comes into contact with the air, which reduces its conducting ability, why is this? (2)"

[Ketchup!]

(Original post by khalidpatel)
i got 25 marks.. ANY idea what grade that could be?

You're basing your mark on what - an unofficial mark scheme posted on here?
Do remember they are unofficial - i.e. answers may vary.

[khalidpatel]

(Original post by Sheel1)
I got about 20/45 ( Lowest and i hope it gets higher!) according to your mark scheme

same i got 25 according to the markscheme

[steviep14]

My Predictions:
(Similar Difficulty to June 2011)

100 UMS - 36
A* - 33
A - 29
B - 23
C - 17

It wasn't an easy paper as such.. but it wasn't as hard as it could be so average boundaries I assume

[tssf_skye]

using that mark scheme i think i gained 30-32 however not all the questions are answered/up there so hopefully i got some more?

[Chlomc]

(Original post by Sheel1)
I got about 20/45 ( Lowest and i hope it gets higher!) according to your mark scheme

The mark scheme is only out of 36 ( theres about 9 marks missing due to noone remebereing the questions :L ) So you may well have more than 20

[Sheel1]

(Original post by Chlomc)
Im pretty sure the "why is gold a good conductor was 2 marks and also theres the question about " iron corrodes when its comes into contact with the air, which reduces its conducting ability, why is this? (2)"

For that one i wrote the air pressure prevents the delocalise electrons moving around so they can't conduct electricity :L I think thats 0/3 though ;L

[tssf_skye]

For the one about why a higher pressure wasn't used, i didn't say expensive i don't know if that's correct.
How many people wrote that?
I'm pretty sure it's something about affecting the yield?