This discussion is now closed.

Check out other Related discussions

AQA A Level Chemistry Paper 1 4th June 2019 Unofficial Markscheme Paper 1

Scroll to see replies

Reply 60

Nina_85262737

Original post by Dreametuber

Does 1.77x10^-4 sound familiar to anyone- can’t remebe what question

Yea. I think I got that for a Ka value ... I think it’s the question following the pH graph cos Ka = [H+]

Reply 61

Dreametuber

What was the equation for NaBr and sulphuric acid

Reply 62

MattyB393

Enthalpy of atomisation is the enthalpy change when one mole of gaseous monoatomic atoms are formed from the constituent element in its standard state, nd that is 0.5I2 (s) ----> I (g), therefore it was just 107

Original post by fopeadedeji

It was in the form 0.5I2—> I , so I don’t think so

Reply 63

Nina_85262737

I thought the bond angle was 86 degrees cos I thought you’re meant to take away from the original bond angle if there are lone pairs ????

Original post by cheesypizza

for ClF3- i remeber getting octahedral shape with bond angle 90

Reply 64

Dreametuber

Oh so it was for that one! I was really unsure about that question

Original post by Nina_85262737

Yea. I think I got that for a Ka value ... I think it’s the question following the pH graph cos Ka = [H+]

Reply 65

jlaw454

thats what i thought
http://www.tutor-homework.com/Chemistry_Help/electronegativity_table/electronegativity.html

Original post by lollypenguin

wasn't the highest electronegativity krypton?

Reply 66

lollypenguin

Original post by Dreametuber

What was the equation for NaBr and sulphuric acid

I think I got it wrong but:

2NaBr + H2SO4 ----> Br2 + SO2 + 2NaOH

Reply 67

username3241486

I got:

2NaBr + H2SO4 ----> Na2SO4 + Br2 + H2O

Original post by Dreametuber

What was the equation for NaBr and sulphuric acid

Reply 68

Gnuyheatmik

Original post by Nina_85262737

I thought the bond angle was 86 degrees cos I thought you’re meant to take away from the original bond angle if there are lone pairs ????

I did that

Reply 69

Dreametuber

I put that but I don’t think it was right

Original post by lollypenguin

I think I got it wrong but:

2NaBr + H2SO4 ----> Br2 + SO2 + 2NaOH

Reply 70

Nina_85262737

It was HBr + H2SO4 —> Br2 + SO2 + H2O

And the observation is red fumes of bromine gas

Original post by Dreametuber

What was the equation for NaBr and sulphuric acid

Reply 71

Uguuubear

Square planar is 90, VSEPR gets weird there

Original post by Nina_85262737

I thought the bond angle was 86 degrees cos I thought you’re meant to take away from the original bond angle if there are lone pairs ????

Reply 72

iamjosephvella

thourghts on boundaries lower or higher?

Reply 73

Uguuubear

I wrote 2NaBr +H2SO4 ->Br2 + SO2 + Na2O +H2O >.>

Brown Fume

Oxidising agent

Original post by lollypenguin

I think I got it wrong but:

2NaBr + H2SO4 ----> Br2 + SO2 + 2NaOH

Reply 74

Nina_85262737

Oh nooooooooo. Urgh. That’s so annoying. I see now :frown:

Original post by Uguuubear

Square planar is 90, VSEPR gets weird there

Reply 75

Dreametuber

The amount of different answers I have seen to this question on TSR 😂😂😂

Original post by Uguuubear

I wrote 2NaBr +H2SO4 ->Br2 + SO2 + Na2O +H2O >.>

Brown Fume

Oxidising agent

Reply 76

username3241486

Honestly they don't change very much each year, but they might be slightly lower considering how blessed last year's was in comparison

Original post by iamjosephvella

thourghts on boundaries lower or higher?

Reply 77

Brianlee

Electro spray is not in the specification?

Reply 78

Trapmoneybenny

Original post by CeliaaaWuuu

don't you need to multipying the 107 by 2? for the atomisation enthalpy change of iodine.

nope it was half

Reply 79

Ssss129

What was KW?

Related discussions

Latest

Articles for you

Students react after A-level Chemistry Paper 1 on 12 June 2023

What is an LLM and how could it benefit your career?

Powerful questions business students forget to ask their career advisers

Why I chose a law degree and what studying law was like

AQA A Level Chemistry Paper 1 4th June 2019 Unofficial Markscheme Paper 1

Related discussions

Latest

Trending

Trending

Articles for you