Chp 2

Question 1

Define relative isotopic mass

2A

Answer 1

• Relative isotopic masses and their percentage abundances in a sample of an element used to calculate relative atomic masses

Question 2

Define what a base peak is?

2A

Answer 2

• Tallest peak in spectrum
• Most common / abundant peak

Question 3

Define what a molecule ion peak is?

2A

Answer 3

• Represents the heaviest ion
• Not always the most abundant

Question 4

What is ionisation energy?

2A

Answer 4

• Amount of energy required to remove one mole of electrons from one mole of gaseous atom of an element to form one mole of gaseous ions
• ENDOTHERMIC
• If electron has high energy&raquo_space; less energy to remove
• If electron has low energy&raquo_space; more energy to remove

Question 5

What are the trends in MP + BP in period 2 + 3?

2B

Answer 5

• MP + BP decrease as go ACROSS period 2 + 3
• Less energy required to break bonds as weak forces of attraction
• Going from giant lattice —> simple molecular