Chemistry Predictions/Thoughts (1 Viewer)

[Engineer_192931]

Wait dw I realise now

 

[Engineer_192931]

Does anyone know what were questions 33 and 35?

 

[ghreysantomy]

Solutions ?
Surely multiple choice at least

 

[=)(=]

The addition of chlorine to an alkene produces a dichloroalkane.

The fact that the mass spectrum appears to show only one is misleading. The product should be 1,2-dichloropropane.

The mass spectrum of the compound can be seen at this link: https://webbook.nist.gov/cgi/cbook.cgi?ID=C78875&Mask=200#Mass-Spec

You can see that it matches the spectrum provided in the exam, but with the lowest intensity peaks missing.

Taking the ³⁵Cl : ³⁷Cl ratio as 3 : 1 yields the parent (molecular) ion, [C₃H₆Cl₂]^{+ .} at m/z = 112, 114, and 116 in a 9 : 6 : 1 ratio.

doesnt 1,2-dichloroprop-1-ene fit cause you could assume Q might have a double bond and since doesnt specify excess cl2 it could only have 1 double bond being saturated also 1,2-dichloroprop-1-ene has 32 percent carbon by mass and has molecular ion peak at 114 it also has a fragment at 15 and 62?

 

[Jane Mao]

Solutions ?
Surely multiple choice at least

Rather than wait for some genius person who got everything right, how bout we just compile everyone’s answers.
Here’s what I had for everything
1. D
2. C
3. B
4. D
5. D
6. C
7. A
8. B
9. C
10. A
11. C
12. B
13. A
14. D
15. B
16. B
17. A
the full paper isn’t uploaded yet so I can’t check this but I think I got all A’s for 18, 19, and 20 (I rushed multiple choice so this could be wrong)
Now if anything looks wrong just tell me and I’ll edit this

 

[jc7726]

Rather than wait for some genius person who got everything right, how bout we just compile everyone’s answers.
Here’s what I had for everything
the full paper isn’t uploaded yet so I can’t check this but I think I got all A’s for 18, 19, and 20 (I rushed multiple choice so this could be wrong)
Now if anything looks wrong just tell me and I’ll edit this

I think i got something like
1D 2C 3B 4D 5D 6C 7A 8C 9C 10A 11C 12B 13A 14(idk but i think B?) 15B 16B 17(idk but i think A) 18(A i think) 19(also A i think) 20D

not sure that these are exactly what i put for everything but i think it's decently close

 

[Goldattacker40000]

Rather than wait for some genius person who got everything right, how bout we just compile everyone’s answers.
Here’s what I had for everything
1. A
2. C
3. B
4. D
5. D
6. C
7. A
8. B
9. D
10. A
11. C
12. B
13. A
14. D
15. B
16. B
17. C
the full paper isn’t uploaded yet so I can’t check this but I think I got all A’s for 18, 19, and 20 (I rushed multiple choice so this could be wrong)
Now if anything looks wrong just tell me and I’ll edit this

1. D
2. C
3. B
4. D
5. D
6. C
7. A
8. C
9. C
10. A
11. C
12. B
13. A
14. D
15. B
16. B?
17. A
I forgot what 18-20 were.

 

[Jane Mao]

I think i got something like
1D 2C 3B 4D 5D 6C 7A 8C 9C 10A 11C 12B 13A 14(idk but i think B?) 15B 16B 17(idk but i think A) 18(A i think) 19(also A i think) 20D

not sure that these are exactly what i put for everything but i think it's decently close

Lol I had a typo for question 1. Please don’t pour organic stuff down the sink
Hmm you guys are probably right about 9 since it gets neutralised really fast.

 

[lounjg]

I think i got something like
1D 2C 3B 4D 5D 6C 7A 8C 9C 10A 11C 12B 13A 14(idk but i think B?) 15B 16B 17(idk but i think A) 18(A i think) 19(also A i think) 20D

not sure that these are exactly what i put for everything but i think it's decently close

i think 14 was D, in the exam i chose C lol,i read sodium carbonate and thought it was nahco3, doing this lead me to 29.

 

[Jane Mao]

Okay so so far these answers should be correct for 1-16

 

[Goldattacker40000]

Lol I had a typo for question 1. Please don’t pour organic stuff down the sink
Hmm you guys are probably right about 9 since it gets neutralised really fast.

Yeah I did C cause the equivilance point was acidic

 

[Goldattacker40000]

What were 18-20 agian?

 

[Jane Mao]

How did you guys prove NH4Cl was a B-L acid? I’m trying to write up dot point solutions

 

[Jane Mao]

What were 18-20 agian?

The uploaded paper doesn’t have the questions so I can’t check working out. I think ppl are saying 18-A, 19-A and 20-D tho

 

[geug]

solutions from conquer to the scuffed incomplete paper

 

[Goldattacker40000]

How did you guys prove NH4Cl was a B-L acid? I’m trying to write up dot point solutions

Dissociates into NH4+ which donates proton to water and there is B-L acid.

 

[geug]

bruh anyone remember what q19 dont remember what i put for that shit

 

[DinoTard]

bruh anyone remember what q19 dont remember what i put for that shit

You were given a mass spec and asked which produced the peak at 43 or something

 

[jc7726]

1. D
2. C
3. B
4. D
5. D
6. C
7. A
8. C
9. C
10. A
11. C
12. B
13. A
14. D
15. B
16. B?
17. A
I forgot what 18-20 were.

i genuinely cant remember what i put for 14 so i might have had the same answer as u, possibly not tho idk

 

[jc7726]

You were given a mass spec and asked which produced the peak at 43 or something

I knew it was between A or B but i didn't know which had the + on it and i didn't know if that was the charge or not so i just had the one where the thing that didnt contain the O had the + which was A i think