ocr chemistry b salters f331 23rd May 2014 thread

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bobo19966
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anyhing need to notice for this I got this exam tmr arggghhh
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diba786
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(Original post by bobo19966)
anyhing need to notice for this I got this exam tmr arggghhh


sameeee
Make sure u know heterogeneous catalyst
Absorption emsission spectra
Mass spectrometer
Bond angles
As they come up every time
Papers are quite repetitive tbh
GOOD LUCK
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bobo19966
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(Original post by diba786)

sameeee
Make sure u know heterogeneous catalyst
Absorption emsission spectra
Mass spectrometer
Bond angles
As they come up every time
Papers are quite repetitive tbh
GOOD LUCK
thanks seems very few people to do chemistry ocr salters b????
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ThatWasHard!
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Any other predictions on what topics come up?

Heterogeneous catalysts always com tbh, as d bond angles

An tips for tonight?
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josqu
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I'm doing it Auto-ignition and pollution always seem to come up as well.
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pinkgorilla
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Im sitting this exam too.
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Solarburst
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Piece of piss
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abbielucy
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Sulphur dioxide quite often comes up and asking to draw skeletal formulas, enthalpy changes and nuclear equations
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bobo19966
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(Original post by abbielucy)
Sulphur dioxide quite often comes up and asking to draw skeletal formulas, enthalpy changes and nuclear equations
these are fine what makes me scared is some of the calculation question because I can't understand the question
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abbielucy
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(Original post by bobo19966)
these are fine what makes me scared is some of the calculation question because I can't understand the question
Yeah me too the ones with volume of gas I just did confused me but I think I understand it now. You always just have to be really logical and write down everything you know and then decide on what triangle to use
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Turtlefushsia
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(Original post by abbielucy)
Sulphur dioxide quite often comes up and asking to draw skeletal formulas, enthalpy changes and nuclear equations
When you say sulphur dioxide do you mean drawing its dot cross diagram? :cool:
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bobo19966
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(Original post by Turtlefushsia)
When you say sulphur dioxide do you mean drawing its dot cross diagram? :cool:
Including describe the shape and bond angles maybe?
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abbielucy
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(Original post by Turtlefushsia)
When you say sulphur dioxide do you mean drawing its dot cross diagram? :cool:
I meant polluting gases the fact it leads to acid rain and stuff but it could ask you to draw it as well
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Turtlefushsia
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(Original post by abbielucy)
I meant polluting gases the fact it leads to acid rain and stuff but it could ask you to draw it as well
Oh right thanks! ..... If they did ask you to draw it and name the shape would it have 2 lone pairs and 2 bonding pairs so would it be tetrahedral with 109 angles?
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abbielucy
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(Original post by Turtlefushsia)
Oh right thanks! ..... If they did ask you to draw it and name the shape would it have 2 lone pairs and 2 bonding pairs so would it be tetrahedral with 109 angles?
I think it's actually trigonal planar 120 but correct me if I'm wrong it's group 6 and forms double bonds with the oxygen meaning it only has one lone pair
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ThatWasHard!
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(Original post by abbielucy)
I think it's actually trigonal planar 120 but correct me if I'm wrong it's group 6 and forms double bonds with the oxygen meaning it only has one lone pair
Its bent

basically:

2 bonding pairs
1 lone pair

therefore, 118 degree bond angle

which means a bent shape

Generally the rule is for every lone pair take 2 degrees off

EDIT: made a mistake

Lone pairs aren't counted in the shape, so its bent (or v-shaped)
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Turtlefushsia
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(Original post by ThatWasHard!)
Yeah it is trigonal planar

basically:

2 bonding pairs
1 lone pair

therefore, 118 degree bond angle

which means a trigonal planar shape

Generally the rule is for every lone pair take 2 degrees off
Thanks for the explanation. Just wondering how do you know it's a double bond?
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abbielucy
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(Original post by ThatWasHard!)
Yeah it is trigonal planar

basically:

2 bonding pairs
1 lone pair

therefore, 118 degree bond angle

which means a trigonal planar shape

Generally the rule is for every lone pair take 2 degrees off
Yeah that's what I thought the exam board don't care about taking degrees off with lone pairs my teacher said
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ThatWasHard!
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(Original post by Turtlefushsia)
Thanks for the explanation. Just wondering how do you know it's a double bond?
(Original post by Turtlefushsia)
Thanks for the explanation. Just wondering how do you know it's a double bond?
Ok so,

the oxidation state of oxygen is always +2

This means that oxygen always needs two electrons

So as its dioxide, it needs four electrons

Sulphur has 6 valence electrons

So two double bonds are formed, with one lone pair left

This makes it V-Shaped or bent
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abbielucy
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(Original post by ThatWasHard!)
Its bent

basically:

2 bonding pairs
1 lone pair

therefore, 118 degree bond angle

which means a bent shape

Generally the rule is for every lone pair take 2 degrees off

EDIT: made a mistake

Lone pairs aren't counted in the shape, so its bent (or v-shaped)
Water is bent though and it has
2 bonding pairs
2 lone pairs ?
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