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just wanted to check my answers to this one

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just wanted to check my answers to this one

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for b) i think its carbon particulates but surely unburned hydrocarbons would look the same?

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for b) i think its carbon particulates but surely unburned hydrocarbons would look the same?

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not 100% sure i was right so submitted it.

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Mainly need help with the polymer question but wouldn't mind help with the question bellow it.

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Hi, Im not really sure how I would answer this question. Thanks.

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In the diagram it appears the B-O-H Bond is 90 degrees, why is it 104.5?

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Hi, could you go through questions 9b ( buffer solution question) I got 0.451g but Im not sure if its correct.

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Hi, could you go through questions 9b ( buffer solution question) I got 0.451g but Im not sure if its correct.

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Hi how would you answer this type of question thank you 

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Hi how would you answer this type of question thank you 

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with this question I don't get this part

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Question 4

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Please could you go through this one- I really do not understand it!

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 unsure how to phrase this or what the answer even is

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 unsure how to phrase this or what the answer even is

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not sure why student is incorrect

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Hi, I am not entirely sure whether to mention entropy of system, surroundings or both, and how to communicate these thoughts into an answer

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Hi, I am not entirely sure whether to mention entropy of system, surroundings or both, and how to communicate these thoughts into an answer

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Hello, im not sure what i need to list

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could you please explain how to answer this question in just 3 marks - i feel like i would end up writing a whole essay for this question

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how do you tackle questions like these without overcomplicating which electrons go where. I always have to spend too much time on these questions just to get all the marks

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how do you tackle questions like these without overcomplicating which electrons go where. I always have to spend too much time on these questions just to get all the marks

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i cant find the 3rd mistake and its modification. Also, I am not sure if the 2 mistakes & modifications I did get are Correct. Thanks!

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i cant find the 3rd mistake and its modification. Also, I am not sure if the 2 mistakes & modifications I did get are Correct. Thanks!

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i got 2 mistakes:
1) weak acid (ethanoic acid) ; should be suitable strong acid like sulfuric acid or hydrochloric acid

2) ammeter ; should be a high-resistance voltmeter

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question 10 spans 2 pages, so in 2 posts

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question 10 spans 2 pages, so in 2 posts

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not sure what i am supposed to be thinking about to answer this - help, please!

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not sure what i am supposed to be thinking about to answer this - help, please!

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How do you phrase this? I know it's to do with shining a polarised plant of light on each enantiomer sample, which should rotate the plane of polarised light in opposite directions, but that seems to long-winded for a 1 marker.

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How do you phrase this? I know it's to do with shining a polarised plant of light on each enantiomer sample, which should rotate the plane of polarised light in opposite directions, but that seems to long-winded for a 1 marker.

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I know the answer, but I am not sure how to write my response

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I know the answer, but I am not sure how to write my response

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This question gave me a headache, please explain!

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This question gave me a headache, please explain!

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Hey! Could you please help with the calculations for these, thanks!

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Hey! Could you please help with the calculations for these, thanks!

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how do you do this logically? i dont know where to start! i tried retrosynthesis, but it felt more difficult going from product to reactant

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how do you do this logically? i dont know where to start! i tried retrosynthesis, but it felt more difficult going from product to reactant

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Hi, I don't know if this question requires transition metal knowledge or are they make it look confusing, but its just a question about equilibriums and entropy

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Hi, I don't know if this question requires transition metal knowledge or are they make it look confusing, but its just a question about equilibriums and entropy

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i got +5 as final oxidation state, but i dont know if that's correct

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i got +5 as final oxidation state, but i dont know if that's correct

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Is my answer right and worth all 4 marks? also, is there any way i can cut down how much i write because it took me 5.5 minutes to write the 4 marker - thanks!!

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Is my answer right and worth all 4 marks? also, is there any way i can cut down how much i write because it took me 5.5 minutes to write the 4 marker - thanks!!

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hi rich!

this is what i wrote for my answer:

1. they are d-block elements because the valence shell electrons of scandium (*insert correct electron config*) and vanadium (*insert correct electron config*) are located in 3d subshells

2. they are not transition metals because transition metals are elements that form one or more stable ions with partially-filled d orbitals

3. scandium only forms 1 stable ion: Sc3+ that has electron configuration of *insert correct electron config*, so has completely empty d orbitals of its 3d subshell

4. zinc only forms 1 stable ion: Zn2+ that has electron configuration of *insert correct electron config*, so has completely filled d orbitals of 3d subshell

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hi how do you answer this question? Thanks

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hi how do you answer this question? Thanks