Group 2 + The Halogens

Question 1

What is BaSO4 used for ?

Answer 1

Used in x rays as it appears opaque.

Question 2

How does reactivity change down G2

Answer 2

Reactivity increases

Question 3

How does the solubility of G2 hydroxids change down the group

Answer 3

It increases

Question 4

What is the test for sulphate ions ?

Answer 4

Add BaCl , white precipitate will form of BaSO4

Question 5

NASA group 2 down group

Answer 5

Nuclear charge increases (more protons)
Atomic radius increases (more shells)
Shielding increases (more shells)
Nuclear attraction decreases

Question 6

what are the products of a G2 metal reacxting with an acid?

Answer 6

metal salt + water

Question 7

what are the products of a G2 metal reacting with water

Answer 7

metal hydroxide

Question 8

what do metal carbonates do ?

Answer 8

neutralise acids

Question 9

what are the colours of Cl2 Br2 and I2?

Answer 9

Cl2 - pale green
Br2 - orange
I2 - purple

Question 10

explain why the halogens have low BPs

Answer 10

strong covelant bonds between atoms but weak london forces between molecules

Question 11

give a use of Cl2 but also why this may be a problem

Answer 11

use - kill bacteria in water
problem - could be carcinogenic when reacts with organic compounds in water

Question 12

what is a disproportionation reaction ?

Answer 12

when the same element gets both oxidised and reduced in an equation

Question 14

what colour are the precipitates of cl- br- and i-

Answer 14

Cl- white
Br- off white
I- yellow