AS June 2016

Question 1

How do van der waals forces arise

Answer 1

1. Electron movement in the first molecule
2. Causes induced temporary dipole in another molecule
3. So š+ attracts š- in different molecules

Question 2

Empirical formula

Answer 2

Simplest whole number ratio of atoms of each element in a compound

Question 3

What happens and what stays the same when 2 (more than 1) electrons are knocked off atoms in time of flight

Answer 3

Stays the same:
1. Peaks at same m/z values
 Because same sample being used
Differently:
2. More peaks at 1/2 m/z value
 Because 2 electrons are knocked off

Question 4

Type of cracking that produces alkEnes c=c and conditions

Answer 4

Thermal cracking
High temperature
High pressure

Question 5

Conclude which element it is due to successive ionisation energies

Answer 5

Sulphur - large energy jump between 6th and 7th IE

Question 6

Which reaction had higher atom economy

Answer 6

Reaction x - fewer/ no by products made