Paper 2-2023

Question 1

Why conical flask inward if beaker gives more accurate results in experiment

Answer 1

Reduces loss of liquid droplets

Question 2

Rate at minute and units

Answer 2

Change minutes to seconds
1/t is rate
Units - gm^-1–

Question 3

why is chloroethanoic acid stronger than ethanoic acid.

Answer 3

cl- ion is electron withdrawing therefore weakens OH bond/ increases polarity of OH

Question 4

rare determining step

Answer 4

slowest step
see if right amount of products have been used up as in rate equation

Question 6

Name isomer: CH2BR-CH2CN

Answer 6

3-bromopropanenitrile

Question 7

CNCH2-CNCH2 to H2N(CH2)4NH2 R+C and equation

Answer 7

LiAlH4 in ether or H2 +Ni catalyst
4H2 in reaction

Question 8

Why frac distillation is preferred to simple titration to separate two liquids

Answer 8

Likely to g gf ave similar bp

Question 9

Why enthalpy values are different than data book values

Answer 9

Less exothermic as incomplete combustion

Question 10

One other environmental problem with implementing combustion of biofuel other than CO2?

Answer 10

Acid rain, SO2

Question 11

Ketene homologous series

Answer 11

CnH2n-2