[Mikes143]

i put carbonyl and arene

[TheStudent.]

(Original post by sharon800)
i put it was flammable so cant be a cleaning thing
and its cheaper because it had low ODP
is that right?

My sis put flammable, and she's smarrrt, so probably lol.

Cheaper wouldn't have gotten you the mark though, because thats sort of irrelevant.

[TheStudent.]

(Original post by Mikes143)
i put carbonyl and arene

Eep i put ketone and alkene

[ells-13]

(Original post by Reina)
Was that the "type of reaction in figure 1" question?

Didn't think of copolymerisation! Initially I though "addition" but then I realised it could be "elimination" the other way...so in the end I put "reversible" but I'm really not very sure...

Br2 --> 2Br-

So it's reduced and the oxidation state goes from 0 to -1

I put reversible reaction for figure 1. Hoping it's right because it had equilibrium symbol.

[sharon800]

(Original post by TheStudent.)
My sis put flammable, and she's smarrrt, so probably lol.

Cheaper wouldn't have gotten you the mark though, because thats sort of irrelevant.

oh no the question asked " why is the compound d cleaper" and it had 0.0 ozone depleting potential
so put low ODP

[Beffnaay]

OCR are so sneaky! It's probably more that I don't read the questions properly to be honest.. hahah.

[dongonaeatu]

how did everyone find it?

[TheStudent.]

(Original post by Xenia7)
Ah gooood me too! but i didnt mention steam... would that matter ?

Not too sure, maybe go through some past mark schemes and check. 300 degrees wouldddd suggest that steam is formed, so i'm thinking it wouldn't make that much of a difference. It was only 2 marks.

[sharon800]

(Original post by ells-13)
I put reversible reaction for figure 1. Hoping it's right because it had equilibrium symbol.

i put copolymerisation because 2 different monomers were incorporated to form that product

[dongonaeatu]

(Original post by sharon800)
oh no the question asked " why is the compound d cleaper" and it had 0.0 ozone depleting potential
so put low ODP

for the question why is it cheaper, you say because it contains no chlorine.

[TheStudent.]

(Original post by sharon800)
oh no the question asked " why is the compound d cleaper" and it had 0.0 ozone depleting potential
so put low ODP

Ohhh ur talking about THAT question lol.

Ahahaha, its cheaper because its cheaper.

Joke.

Errrmmm yeh maybe, dunno. I put it doesn't contain Cl2 or fluorine, sooo its easier to extract, because they're both highly reactive and need to be stored as liquids during transport.

[TheStudent.]

It was an equilibrium reaction

[Doganayik]

(Original post by TheStudent.)
H3PO4, 60 atm, 300degrees, steam

I wrote concentrated H₂SO₄ then H₂O at 1 atm

[TheStudent.]

(Original post by Reina)
Probably not? I guess if you get marks in the previous question for writing down S goes from +4 to +6 you won't get any marks in the next question for writing the same thing.

Surely you mean that vice versa.

If the oxidation states were +4 to +6, there's no point saying that X is a reducing because the oxidation states go from +4 to +6, because thaaaaat is repetition.

Its not repetition if you say the oxidations state of X molecule decreases.

[sharon800]

(Original post by TheStudent.)
It was an equilibrium reaction

how many marks for a B usually?

[TheStudent.]

(Original post by Doganayik)
I wrote concentrated H₂SO₄ then H₂O at 1 atm

Yeh i think there are two different reaction pathways. Might be wrong though, i only memorised one of them to avoid confusion.

[dongonaeatu]

(Original post by TheStudent.)
Surely you mean that vice versa.

If the oxidation states were +4 to +6, there's no point saying that X is a reducing because the oxidation states go from +4 to +6, because thaaaaat is repetition.

Its not repetition if you say the oxidations state of X molecule decreases.

Sulfur was the reducing agent.

[TheStudent.]

(Original post by sharon800)
how many marks for a B usually?

70/100 = Ans - 0.07 ( i think )

[Beffnaay]

I thought types of reaction refers to addition, substitution, elimination etc? Is 'copolymerisation' or equilibrium an actual type of reaction?

[dongonaeatu]

(Original post by Beffnaay)
I thought types of reaction refers to addition, substitution, elimination etc? Is 'copolymerisation' or equilibrium an actual type of reaction?

no