T4

Question 1

What are the properties of group 2 elements?

Answer 1

white compounds
high density
high bp and mp

Question 2

Are group 2 oxidising or reducing agents?

Answer 2

reducing agents

Question 3

When G2 metals react with oxygen, what is formed?

Answer 3

white ionic solids

Question 4

G2 metals + water =

Answer 4

hydroxides + hydrogen

Question 5

G2 oxides with water

Answer 5

form metal hydroxides
alkaline because they release OH ions

Question 6

Why does thermal stability of carbonates/nitrates in goup 2 increase down the group ?

Answer 6

• G2 has a large charge
• larger radius
• so lower charge density
• hence the weaker the polarising power
• attracts the bodning electrons in the negative ion less strongly.
• will distort the lecton cloud less
• makes it hardre to break apart and decompose.

Question 7

How to test for thermal stability of nitrates?

Answer 7

• test how long an amount of brown gas to be produced
• need to do it in a fume cupboard.

Question 8

Uses of Mg

Answer 8

milk of mg is used to neturalise excess acids

Question 9

colours of halgens?

Answer 9

Fl- yellow gas
Cl- green gas
Br- brown gas
I- grey solid

Question 10

What is the trend in reactivity down G7?

Answer 10

decreases

Question 11

Colours of halogens in water and in organic solvent?

Answer 11

water:
cl- colourless
Br- yellow/orange
I- brown

Organic solvent
cl- colourless
Br- orange/red
I- purple

Question 12

Which halogen is the strongest reducing agent and the strongest oxidising agent?

Answer 12

Strongest:
reducing agent - iodine
oxidising agent - chlorine