Chapter 2

Question 1

What is relative atomic mass? (Ar)

Answer 1

Relative atomic mass is the weighted mean mass of an atom of an element compared to 1/12 of the mass of an atom of carbon-12

Question 2

What is relative isotopic mass?

Answer 2

Relative isotopic mass is the mass of an atom of an isotope compared with 1/12 of the mass of an atom of carbon-12

Question 3

What does the height of each peak on a mass spectrometry graph represent?

Answer 3

The height of each peak represents the relative isotopic abundance

Question 4

What is relative isotopic abundance?

Answer 4

Relative isotopic abundance is the percentage of that particular isotope that occurs in nature

Question 5

How do you work out m/z- the mass to charge ratio?

Answer 5

m/z= relative mass of ion /relative charge of ion

Question 6

What is the mass to charge ratio equivalent to in most cases?

Answer 6

The mass to charge ratio is equivalent to the relative isotopic mass when the ion has one positive charge

Question 7

How do you find the relative atomic mass?

Answer 7

To find the relative atomic mass

1) multiply each relative isotopic mass by its relative isotopic abundance
2) divide by the sum of the isotopic abundances

Question 8

What is relative molecular mass

Answer 8

Relative molecular mass is used when referring to simple molecules

Question 9

What is relative formula mass

Answer 9

Relative formula mass is used when referring to giant covalent or ionic compounds

Question 10

Formula of nitrate ion

Answer 10

NO3-

Question 11

Formula of silver ion

Answer 11

Ag+

Question 12

Formula of ammonium ion

Answer 12

NH4+

Question 13

Formula of carbonate ion

Answer 13

CO3 2-

Question 14

Formula of zinc ion

Answer 14

Zn 2+

Question 15

Formula of hydroxide ion

Answer 15

OH-

Question 16

Formula of sulphate ion

Answer 16

SO4 2-