Chem MS

Question 1

m3 -> cm3

Answer 1

x1000000

Question 2

dm3 -> cm3

Answer 2

x1000

Question 3

dm3 -> m3

Answer 3

/1000

Question 4

cm3 -> m3

Answer 4

/1000000

Question 5

mg -> g

Answer 5

/1000

Question 6

moldm-3 -> gdm-3

Answer 6

x Mr

Question 7

forming ions in mass spectrometry

Answer 7

sample bombarded by high energy electrons

sample loses an electron forming M+

Question 8

explain name for E-Z isomer

Answer 8

on RH C of C=C. consider highest Ar for highest priority
on LH C of C=C both contain C so need to consider bond further and state which is highest priority
conclude if highest priority groups are on the same side or opposite
name the rest of the isomer

Question 9

how to improve practical to get more consistent results

Answer 9

use a larger single volume of the reactant
dissolve the reactant in a solvent
transfer to a volumetric flask and make up 250cm3 with the solvent
titrate 25cm3 samples from the flask

Question 10

separate two substances by fractional distillation

Answer 10

state which has lower bp/ boils first
lower bp condenses and is collected
weaker v.d.w. forces between molecules

Question 11

why is bond enthalpy different in data book than practical calculation

Answer 11

data book value is derived from a number of different compounds