2.1 Mocks

Question 1

When does H have an oxidation state of -1?

Answer 1

Metal hydrides

Question 2

When does O have an oxidation state of NOT -2?

Answer 2

In H2O2

Question 3

Steps to determine formula of hydrated salt

Answer 3

Heat to constant mass
Mass of hydrated salt
Mass of anhydrous salt
Difference = mass of water

–> Find moles of salt, then water, then ratio

Question 4

Simple way to determine formula of hydrated salt

Answer 4

Use H number to determine number of water molecules

Question 5

1atm in Pa

Answer 5

101000

Question 6

0°C in K

Answer 6

273K

Question 7

Water of crystallisation definition

Answer 7

Water molecules that form an essential part of the crystalline structure of a compound

Question 8

What does it mean when there are 2 equal peaks on a mass spectrometry graph?

Answer 8

Each isotope is 50%

Question 9

Key phrase when writing about water of crystallisation experiments

Answer 9

‘Heat to constant mass’

Question 10

1 mole of any gas takes up __ dm³ at room temperature and pressure

Answer 10

24dm³

Question 11

1 mole of any gas takes up __ dm³ at standard temperature and pressure

Answer 11

22.4dm³

Question 12

Stp

Answer 12

0°C
1atm

Question 13

pV = nRT units

Answer 13

Pa × m³ = mol × 8.314 × K

Question 14

Moles 24 Volume equation

Answer 14

n = vol ÷ 24dm³mol‐¹