Describe the the trend of volatility down the group
It decreases because the london forces becomes stronger so more energy is needed to overcome the forces
1 of 20
Describe the trend of rectivity down the group
Reactivity decreases because the outer shell becomes futher away from the nucleus and greater sheilding so difficult to gain electrons so becomes less of an oxidisng agent
2 of 20
State the products formed between this group 7 element and water: H20 + Cl2
HCl + HClO
3 of 20
What happens to blue litmus paper when H+ions are present
turns Red
4 of 20
What happens to red litmus paper when ClO- is present
becomes bleached
5 of 20
When estimating Cl2 in drinking water what is added to the water
excess iodide ions
6 of 20
During this process what becomes oxidised and reduced
white chlroine is reduced and iodine ions are oxidised
7 of 20
How is the amount of iodione produced determined
through titration
8 of 20
What is used during the titration
S2O3 with starch indicator
9 of 20
What is the colour change with the indicator
blue/black to colouless
10 of 20
What is the colour change without the indicator
orange/yellow to colourless
11 of 20
What is the reaction between chlorine and NaOH called and what is the product called?
a disprotionate reaction , bleach
12 of 20
Why is nitric acid added to the halide ions first
To remove any OH- ions and Carbonate ions so they dont interfere with the silver atoms
13 of 20
What is added secondly to the halide ions
silver nitrate- AgNO3
14 of 20
what can be added to test their solubilty
NH4OH
15 of 20
when H2SO4 is added to Ba(OH)2 what happens and what forms?
BaSO4 and H2O is formed and the barium metal stops reacting after a few minutes because the BaSO4 layer beacomes insoluable and prevents reaction
16 of 20
how do we test for CO3 2- ions
add any acid, if CO2 forms it is present
17 of 20
how to we test for CO2
bubble the gas through lime water is a white precipitate of Ca(OH)2 is formed it is present
18 of 20
what is the formulae for the test of ammonium ions
NH4+ + OH- ------> NH3 + H2O
19 of 20
What colour does red litmus paper turn when ammonia gas is present
blue
20 of 20
Other cards in this set
Card 2
Front
Describe the trend of rectivity down the group
Back
Reactivity decreases because the outer shell becomes futher away from the nucleus and greater sheilding so difficult to gain electrons so becomes less of an oxidisng agent
Card 3
Front
State the products formed between this group 7 element and water: H20 + Cl2
Back
Card 4
Front
What happens to blue litmus paper when H+ions are present
Back
Card 5
Front
What happens to red litmus paper when ClO- is present
Comments
No comments have yet been made