- Messages
- 129
- Reaction score
- 203
- Points
- 53
Color changes from --- to ---- when adding aldehyde to
- Fehling's Solution
- Tollens Reagent
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i think they didnt ask for 'sign' usually they ask to calculate enthalpy change and give its sign along with it.look at this
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w13_qp_23.pdf
Q2 d (ii) .. why the answer is Positive not negative ??
1. blue to orange redColor changes from --- to ---- when adding aldehyde to
Help me!
- Fehling's Solution
- Tollens Reagent
Color changes from --- to ---- when adding aldehyde to
Help me!
- Fehling's Solution
- Tollens Reagent
i gave the answer .Blue to Orange
and in Tollens : Colorless to Silver Mirror
What is the color change of ketone in Iodoform test?1. blue to orange red
and 2. colorless to silver mirror type.
LoL. Its really feels like a race or a competitioni gave the answer .
ohhhh! thankyouuuu so muchh!Oh this question has given me a lot of trouble lately.
I went with (21/1)*(1/9) = 21/9 = 7/3
My explanation was something like 21/1 = ratio of rate of tertiary to primary H. 1/9 = ratio of tertiary to primary H present. Ratio of J/K = 21/1 * 1/9 = 21/9 = 7/3
J= Tertiary Hydrogen replaced.
K= Primary Hydrogen replaced.
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w13_qp_23.pdf
Q2 d (ii) .. why the answer is Positive not negative ??
robinhoodmustafa are you confident with your answer ?! >.> .. I think It is not the reason :|
not directly that why i asked him if it was from past papers. You just use it to form compunds after electrophylic addition reactions :3
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_w13_qp_23.pdf
Q2 d (ii) .. why the answer is Positive not negative ??
So is it wrong If we showed - sign ? robinhoodmustafa
Yes in a sense you can, however the better reason will be that C does not have empty D orbitals. just remember this one line statement it....
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Chemistry (9701)/9701_s04_qp_4.pdf Q2c(i) i get the answer but cant we state the size of carbon atom being smaller than silicon as a valid reason
i gave the answer .
Does CH3COOH give positive test in iodoform test? And also CH3CH2OH? there is some confusion because marking scheme gives positive with ethanol but not ethanoic acid
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