A-level Chemistry Revision Squad!
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Original post by PlayerBB
Ah thanks but isn't it HCl gas that is produced and it should evaporate ?
Why would it evaporate in water
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Original post by Supermanxxxxxx
I don't know, I guessed because they always mention the formation of misty fumes from this reaction, anyways thank you!!
Does anyone have a question on kinetics with three columns instead of two so I can work out the order of reactions?
I know how to do it with two columns but I want to practice with 3.
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I know how to do it with two columns but I want to practice with 3.
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Original post by ayvaak
Hey guys! Could anyone help me understand why the answer is A. Thanks in advance 
The ratio of hydrocarbon and water is 10:20 or 1:2. Because the volume of gas contracted is due to formation of water. There are 4 moles of hydrogen atoms in 2 moles of water. For all given options carbon has 4 moles. Hence answer is A.
Quick question y'all, about halogen displacement visualisations. When in a displacement reaction, and I2 is produced. What is the color change? I'm getting conflicting results, is it brown or deep purple? Isn't the color of iodine dark grey, so shouldnt it be grey?
Original post by AlphaWolfZ
Quick question y'all, about halogen displacement visualisations. When in a displacement reaction, and I2 is produced. What is the color change? I'm getting conflicting results, is it brown or deep purple? Isn't the color of iodine dark grey, so shouldnt it be grey?
I thought iodine produced a black precipitate?
Original post by voltz
I thought iodine produced a black precipitate?
See this is where I'm getting confused. Here are 2 different videos with different colors?
1) [video="youtube;A8NfWNzxlOQ"]https://www.youtube.com/watch?v=A8NfWNzxlOQ&index=5&list=PLX4e2DxFRGQJdG5Zr81v5OiE4f cD3mcAb[/video]
2) 7 minute mark: [video]https://youtu.be/XqAZgH6APcM?list=PL0yIQjy59R-DxAySwkCJVtnozgAmToHYd[/video]
Original post by AlphaWolfZ
See this is where I'm getting confused. Here are 2 different videos with different colors?
1) [video="youtube;A8NfWNzxlOQ"]https://www.youtube.com/watch?v=A8NfWNzxlOQ&index=5&list=PLX4e2DxFRGQJdG5Zr81v5OiE4f cD3mcAb[/video]
2) 7 minute mark: [video]https://youtu.be/XqAZgH6APcM?list=PL0yIQjy59R-DxAySwkCJVtnozgAmToHYd[/video]
1) [video="youtube;A8NfWNzxlOQ"]https://www.youtube.com/watch?v=A8NfWNzxlOQ&index=5&list=PLX4e2DxFRGQJdG5Zr81v5OiE4f cD3mcAb[/video]
2) 7 minute mark: [video]https://youtu.be/XqAZgH6APcM?list=PL0yIQjy59R-DxAySwkCJVtnozgAmToHYd[/video]
I would use the second video (by Mr Rinthoul) as that was uploaded recently and I use his videos myself. The other video is from 2014 so its probably the old spec
Original post by voltz
I would use the second video (by Mr Rinthoul) as that was uploaded recently and I use his videos myself. The other video is from 2014 so its probably the old spec
I guess I'll just follow Mr Rintoul then. Thanks for the confirmation.
Original post by AlphaWolfZ
Quick question y'all, about halogen displacement visualisations. When in a displacement reaction, and I2 is produced. What is the color change? I'm getting conflicting results, is it brown or deep purple? Isn't the color of iodine dark grey, so shouldnt it be grey?
I think its usually due to the state of the halogen. I2 is browny yellow in solution and grey black as a solid and purple as a gas
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Can someone list all of the mechanisms we need to know?
Original post by shiney101
How would you name: CH3-NH-CH(CH3)2
Let me take a guess.
N-methylpropan-2-amine.
Oh yeaaah look at that http://www.chemexper.com/chemicals/supplier/cas/4747-21-1.html.
Original post by Anna1909
Free radical substitution
Nucleophilic substitution
Electrophilic addition
Elimination (dehydration)
Elimination
Acid catalysed addition
I think that's it!
Nucleophilic substitution
Electrophilic addition
Elimination (dehydration)
Elimination
Acid catalysed addition
I think that's it!
Is this everything or have I missed something? ASMechanisms.pdf
Original post by voltz
Can someone go over hydration reations quickly because I dont understand the mechanism
Post 74 gives a summary of hydration.
http://www.thestudentroom.co.uk/showthread.php?t=4148507&page=4
Colour changes for methyl orange and phenolphtalein ?
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