OCR Chemistry Salters B F331 27th May 2016 (Old specification)

OP

what did you put for the thermal stability question with the table?

As you go down the group, thermal stability increases because the mass of fuel lost after burning decreases. Then to test using limewater, heat carbonates and bubble the resulting gas through limewater, time how long it takes to go cloudy, the more thermally stable ones take longer

Reply 61

SohaXO

3

I got 4 areas of electron density, 109 and bent shape for SO4

Reply 62

username1084917

16

For the zeolite one ( Contains holes which trap branched hydrocarbons, the compounds both are branched as they have methyl groups so they get trapped)

Reply 63

Kwaks

9

Original post by samhorton11

B A C E D?
I didn't know wave particle duality was on the spec?

For my order I put B A C D E I didn't know what wave duality is.

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Reply 64

sam2222

6

Original post by SohaXO

I got 4 areas of electron density, 109 and bent shape for SO4

I think I put 109 , and yea same!

Reply 65

Kaz_96

OP

8

Original post by SohaXO

I got 4 areas of electron density, 109 and bent shape for SO4

Shape was tetrahedral because there are 4 bonding pairs around the central S?

Reply 66

SohaXO

3

Original post by Kaz_96

As you go down the group, thermal stability increases because the mass of fuel lost after burning decreases. Then to test using limewater, heat carbonates and bubble the resulting gas through limewater, time how long it takes to go cloudy, the more thermally stable ones take longer

That's what I said too, co2 gas bubbles through the limewater turning it cloudy

Reply 67

SohaXO

3

Original post by Kaz_96

Shape was tetrahedral because there are 4 bonding pairs around the central S?

Sorry yeah tetrahedral, but I saw bent online after he exam I searched

Reply 68

sam2222

6

Original post by Kwaks

For my order I put B A C D E I didn't know what wave duality is.

Posted from TSR Mobile

I think that is talking about the latest quantum model? electrons exist in sub shell thing

Reply 69

Fishhy34

5

What did you guys write for the bond angle? Because it said its attached to two other oxygens?

Reply 70

meg16

1

Shape is tethradehral for 4 areas no lone pairs and I put same for thermal stability also for the zeolite of F was branches and the other one was straight I thought ?