Notes on PPQs/in general

Question 1

what effect do impurities have on the mp & bp of a substance?

Answer 1

decrease mp as they disrupt the crystal/lattice structure?
increase bp

Question 2

why is the solution containing [Al(H2O)6]3+ acidic?

Answer 2

Al3+ is highly charged & small size
Al3+ attracts the e-s from the O-H bond
O-H bond is polarised
O-H weakens
H+ released

Question 3

LOOK AT WHERE GRAPH AXES START

Answer 3

MIGHT NOT BE 0

Question 4

HCl reacts with NaOH in another reaction

Answer 4

reacting ratio is 1:1 NOT using the molar ratio in the previous step

Question 5

what are the bond angles in cyclohexane?

Answer 5

all 109.5

Question 6

what is the order of polarity of C=O, O-H & -O- bonds?

Answer 6

most polar –> least polar
O-H
C=O
-O-

Question 7

what is the name of product of electrophilic addition with sulfuric acid?

Answer 7

___-yl hydrogen sulfate
e.g. ethyl hydrogen sulfate