group 7 pt 2

Question 1

give an example of what happens when a solution of a halide ion is added to a solution of halogen

Answer 1

cl2 + 2I- = 2 cl- + I2

Question 2

what are halide ions in solution

Answer 2

colourless

Question 3

the colour of the solution of halide ions is determined by what

Answer 3

colour of halogen in aq solution

Question 4

where in the group are the halogens that react

Answer 4

top

Question 5

state the trend in the oxidising power of the halogen down group 7

Answer 5

• decreases
• atoms get bigger
• more shell
  -more shielding

Question 6

what is the observation, product and type of reaction of concentrated sulfuric acid and sodium fluoride

Answer 6

• steamy white fumes
  -HF
• acid-base

Question 7

what is the observation, product and type of reaction of concentrated sulfuric acid and sodium chloride

Answer 7

• steamy white fumes
  -HCl
• acid-base

Question 8

what is the observation, product and type of reaction of concentrated sulfuric acid and sodium bromide

Answer 8

• steamy white fumes
  -HBr
• acid-base
• brown fumes/ orange vapour
  -br2
• oxidation of Br-
• colourless choking gas
  -so2
  reduction of H2So4

Question 9

what is the observation, product and type of reaction of concentrated sulfuric acid and sodium iodide

Answer 9

• steamy white fumes
  -HI
• acid-base
• purple gas / black solid
  -I2
  -oxidation of I

-colourles choking gas

Question 10

which halide ions dont/do reduce the sulfur in sulfuric acid

Answer 10

Cl- and F-
Br- and I-

Question 11

state the trend in reducing ability down the group

Answer 11

increases
- ions get larger
- more shielding