Chap 3 Booklet

Question 1

difference between relative molecular mass, relative formula mass and relative atomic mass

Answer 1

molecular
.covalent compounds
.sum of relative atomic masses of all atoms of all atoms in a molecule
.e.g H2O = 18
formula
.Ionic compounds
.sum of the relative atomic masses of all the ions in a formula unit of the compound
.e.g NaCl = 58.5
Atomic mass
.applies to individual atoms
.Cl = 35.5

Question 2

Explain anhydrous, hydrated, water of crystallization

Answer 2

Anhydrous
.substance contains no water
Hydrated
.contains water molecules within its crystal structure
Water of Crystallization
.water molecules that are part of the crystal structure of a hydrated compound

Question 3

techniques

Answer 3

Measuring mass
.calibrate the balance and other very obvious stuff
Measuring volumes
.read the meniscus