M2 C2 Atom, Ions & Compounds

Question 1

Define isotope

Answer 1

Atoms of an element (same number of protons) with a different number of neutrons and different masses

Question 2

Define relative atomic mass

Answer 2

The weighted mean mass of an atom of an element relative to 1/12th of the mass of an atom of carbon-12

Question 3

Define relative isotopic mass

Answer 3

The mass of an atom of an isotope relative to 1/12th of the mass of an atom of carbon-12

Question 4

What is mass spectrometry and what are its uses

Answer 4

An instrumental technique that can

• determine relative isotopic masses and their relative abundances in an isotope abundance
• from this relative atomic mass can be found

Question 5

What is the charge of a nitrate ion

Answer 5

1-

NO3

Question 6

What is the charge of a carbonate ion

Answer 6

2-

CO3

Question 7

What is the charge of a sulfate ion

Answer 7

2-

SO4

Question 8

What is the charge of a sulphide ion

Answer 8

1-

SO3

Question 9

What is the charge of a hydroxide ion

Answer 9

1-

OH

Question 10

What is the charge of an ammonium ion

Answer 10

1+

NH4

Question 11

What is the charge of a zinc ion

Answer 11

2+

Zn

Question 12

What is the charge of PO4 (phosphate)

Answer 12

3-

Question 13

What is the charge of Ag (silver)

Answer 13

1+

Question 14

when is relative molecular mass or relative formula mass used

Answer 14

relative molecular mass- simple molecules

relative formula mass- compounds with giant structures