National 5 Chemistry

There was a question where you had to draw the structural formula when you were give the shortened structural formula and I got confused because the end carbon atoms only had three bonds so did any one add double bonds in??

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Reply 541

Jay431

2

Original post by Abbyy1234

There was a question where you had to draw the structural formula when you were give the shortened structural formula and I got confused because the end carbon atoms only had three bonds so did any one add double bonds in??

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Take a pic of what you drew and post it here if u can remember.

Reply 542

Puppo

15

Original post by Abbyy1234

There was a question where you had to draw the structural formula when you were give the shortened structural formula and I got confused because the end carbon atoms only had three bonds so did any one add double bonds in??

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That question threw me for a loop. I put double bonds in but honestly I hadn't a clue what I was doing.

Reply 543

lornc

1

Did anyone else think that this paper was quite different this year? Loads of problem solving and there questions that I was 100% sure would come up didn't, like graphs, etc.

Reply 544

M3g4nxx

Original post by lornc

Did anyone else think that this paper was quite different this year? Loads of problem solving and there questions that I was 100% sure would come up didn't, like graphs, etc.

Yeah, I feel like I'm in the minority of people who actually struggled with quite a lot of this years paper haha

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Reply 545

Puppo

15

Original post by lornc

Did anyone else think that this paper was quite different this year? Loads of problem solving and there questions that I was 100% sure would come up didn't, like graphs, etc.

I expected it to be different bc the papers change but there was quite a lot of problem solving (not my strong point lol). I'm sure it was a fair paper but just some weak points for me.

Reply 546

Emmaj2000

6

Original post by Abbyy1234

There was a question where you had to draw the structural formula when you were give the shortened structural formula and I got confused because the end carbon atoms only had three bonds s7o did any one add double bonds in??

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Yeah cause I was always told carbon must have 4 bonds

Original post by Abbyy1234

There was a question where you had to draw the structural formula when you were give the shortened structural formula and I got confused because the end carbon atoms only had three bonds so did any one add double bonds in??

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Reply 547

Emmaj2000

6

In the question where you had to use the specific heat capacity to calculate the temperature increas what did you get? I got 55, and the other two people in my school in the exam got 18 and 0.4. So yeah I'm really worried I've completely messed that one up.

Reply 548

Ethan100

15

Original post by Abbyy1234

There was a question where you had to draw the structural formula when you were give the shortened structural formula and I got confused because the end carbon atoms only had three bonds so did any one add double bonds in??

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OMG Abbyy, someone thinks the same way I did, I didn't doa double bond but it was very unusual for carbon not to have 4 bonds... It should have said anyway if it was a double bond in the structural formula. Are we supposed to assume its a double bond ? I was always taught to show a double bond in a structural formula. I didn't add a double bond because I thought maybe it was a rule breaker that you would learn about.

(edited 7 years ago)

Reply 549

reveen

1

hey guys you have to add the double bond in for this question. this is because when you get the molecular formula you should be able to find the general formula by counting the number of the atoms in the molecules. (No.of Carbon atoms etc.) once you find this general formula you should be able to find what family of hydrocarbon that it belongs too. (Alkene or Alkane). This will then help you decide whether you should put in the double bond or not. Hope this helps :smile:

Reply 550

M3g4nxx

Original post by Emmaj2000

In the question where you had to use the specific heat capacity to calculate the temperature increas what did you get? I got 55, and the other two people in my school in the exam got 18 and 0.4. So yeah I'm really worried I've completely messed that one up.

I got 55 as well and I know quite a lot of others at my school who got that too!😊

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Reply 551

Emmaj2000

6

Original post by M3g4nxx

What did people put for the question about another reason why ammonia is a good fertiliser?

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I put that it could be converted into nitrogen by nitrifying bacteria that is required for plant growth but I have no idea if thats right sorry :s-smilie:

Reply 552

Aaaaa01

2

Original post by Jay431

For what question? The one that went like:

"What can sodium be described as" Something like that?

Yea. Was that insulator? The ion bridge thing

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Reply 553

Abbyy1234

2

Original post by Ethan100

OMG Abbyy, someone thinks the same way I did, I didn't doa double bond but it was very unusual for carbon not to have 4 bonds... It should have said anyway if it was a double bond in the structural formula

Yeah that's what I thought so it would've have been like CH2=CH(CH3) etc

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Reply 554

Puppo

15

Original post by Emmaj2000

In the question where you had to use the specific heat capacity to calculate the temperature increas what did you get? I got 55, and the other two people in my school in the exam got 18 and 0.4. So yeah I'm really worried I've completely messed that one up.

I got 55 as well and my friend did too. Another friend got a different answer but I've seen a few people on here with 55 so maybe we're right or maybe we're wrong haha

Reply 555

reveen

1

i think 55 is correct as it sounds like the correct number. I also got 55 as well. :smile:

Reply 556

Abbyy1234

2

Wow my typing is atrocious

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Reply 557

Aaaaa01

2

Original post by M3g4nxx

For what question?

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The sodium ion bridge one

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Reply 558

Jay431

2

Original post by lornc

Did anyone else think that this paper was quite different this year? Loads of problem solving and there questions that I was 100% sure would come up didn't, like graphs, etc.

Yes. It was very different. Different in a good and bad way. There were some hard questions and some not so bad, But there was a lot of new questions.

Original post by Ethan100

OMG Abbyy, someone thinks the same way I did, I didn't doa double bond but it was very unusual for carbon not to have 4 bonds... It should have said anyway if it was a double bond in the structural formula. Are we supposed to assume its a double bond ? I was always taught to show a double bond in a structural formula. I didn't add a double bond because I thought maybe it was a rule breaker that you would learn about.