First Google result says NaOH can't be used to hydrolyse proteins as it breaks down the amino acids, so I'm pretty sure that would be wrong. Using HCl is the process included in the spec but the equation only shows H+ so I feel like the choice of acid isn't too important.

Reply 32

homemadeclock

so for z isomerism i just put the double bonds flat instead of at a 45 degree what did everyone else do?

Reply 33

Amaaaaaaaan

Got 19991 for something but 19900 to 3.S.F
183Kg for Paracetemol

Reply 34

homemadeclock

find the moles of each and then divide to find yeild, 80 something wasn't it?

Original post by jamesctu

does anybody know how to calculate this question

Reply 35

Lucallah

Original post by jamesctu

does anybody know how to calculate this question

mass = density × volume, mole ratio is 1:1, find moles then divide actual by theoretical

Reply 36

homemadeclock

I put NaOH because Hcl is reversible so NaOH is better? but i think either will be okay

Reply 37

not_XIX_forever

Isn't NH4Br formed not HBr?

Reply 38

Mcgreggorrrrrrrr

Original post by Gnuyheatmik

Tell me your answers so I can update this
I can’t really remember much

Equation 1,6-dibromohexane and excess ammonia

C6H12Br2 + 2 NH3 —-> C6H16N2 + 2 HBr

Nucleophilic substitution skeletal formula with ammonia
Cyclic compound by-product

Equation of ethanoic anhydride (hydrolysis? can't remember)
Forms Ethanoic Acid and Ethanol

Explain the term Complementary in terms of DNA strands
Dna strands have complementary base pairs which are able to form hydrogen bonds between them

Draw hydrogen bonds between the strands
3 bonds between C and G
2 bonds between A and T

Circle the components that make up the nucleotide with cytosine
3 Circles around:
Phosphate group, 2-Deoxyribose, Cytosine

Vegetable Fat Question with CxHy

Initial Rates
3.2 x 10^-4
3.2 x 10^-4
First order
Second order

Bunch of numbers I can remember
1.39
182kg
20000
2.57 x 10^9 Arrhenius
28.5% percentage yield

Diagram Distillation apparatus
Add condenser and thermometer

Hydrolysing proteins
HCl or NaOH debate about his one

Labelling infrared spectrum F,G,E can’t remember the order

6 marker on the 2 different compounds (one was a cyclic ketone the other was an alcohol)
-boiling points
Hydrogen bonding in one of them stronger than dipole forces
-Cnmr
-infrared spec

CO2 how does it cause global warming

Minimum number of amino acids in mixture
7

How to see the amino acids
Fluorescent dye and UV/Ninhydrin

How can they tell if the sample has dried by adding anhydrous calcium something ...

The weird question on Z,Z adding the carbons to a skeletal formula

Name mechanism with benzene
Electrophilic substitution

Reaction with bromine finish off the mechanism
- electrophilic addition forming carbo cation then the second bromine ion adds on. Forms dibromo...

Distinguishing between primary and tertiary alcohol
Add acidified potassium dichromate
Orange --> Green
No Change

Last question about nucleophile not being able to attack an Alkene.
I think it’s either:
C=O is polar so the nucleophile can attack the partially positive carbon. The alkene doesn’t have a C=O group so not polar so can’t be attacked by nucleophile.
OR
The nucleophile repels the double bond in the alkene

Insufficient NaH4B added. Test for aldehyde
Add tollens/fehlings
Silver mirror/red ppt

Molecular/Emperical formula question
C5H8 you had to times by 5 to get a whole number
Structure was C=C-C=C

Formula of the dicarboxylic acid with an Mr of 118
HOOC- (CH2)2 -COOH

Electrospray question can’t remember

Draw two structures for C6H3Br3
One with One peak in C nmr
One with 4 peaks in C nmr
Benzene ring/kekule structure (several correct answers for this one)

Synthesis question
Nitrobenzene to amine equation finish off equation
Add 6[H] to form 2H2O
Reagents are H2 and Ni (more than one correct answer for this one)

Reactants and conditions for something
KCN aqueous ethanolic
Sn/HCl (think there is more than one correct answer for this one)

Did it ask for the reagents for the reduction of nitrobenzene???

Reply 39

Lucallah

Original post by homemadeclock

I put NaOH because Hcl is reversible so NaOH is better? but i think either will be okay

I think you might be thinking about esterification. Hydrolysis of (poly)amides isn't reversible. (Equation is amide + H2O + H+ gives carboxylic acid + ammonium). Proteins shouldn't be hydrolysed using NaOH as it would break down the amino acids. (I think, I tried to Google it when I got home. Correct me if you have anything better 😂)