Reactivity Trends

Question 1

What is a group 2 element in a redox reaction?

Answer 1

The reducing agent

Question 2

Why does the ionisation energy decrease down group 2?

Answer 2

The attraction between the nucleus and the outer electrons decreases as a result of increasing atomic radius and increasing shielding

Question 3

What happens to the solubility of hydroxides as you travel down group 2?

Answer 3

Increases

Also the pH and alkalinity of the hydroxides increases as well

Question 4

How are group 2 hydroxides used in agriculture?

Answer 4

Added as like to acidic soils to increase pH

Question 5

Why do group based relieve indigestion?

Answer 5

Neutralise stomach acid

Question 6

Which group is the halogens?

Answer 6

7

Question 7

What kind of molecules are the halogens?

Answer 7

Diatomic

Question 8

What happens as you travel down group 7?

Answer 8

More electrons
Stronger ldf
More energy needed to break ldf
Boiling point increases

Question 9

What are the most common reactions of group 7?

Answer 9

Redox reactions

Question 10

What happens to group 7 in a redox reaction?

Answer 10

Reduced

Question 11

What is a group 7 element in a redox reaction?

Answer 11

Oxidising agent

Question 12

What happens to the reactivity of the halogens as you travel down the group?

Answer 12

Decreases

Question 13

How can you show the decrease in reactivity of the halogens?

Answer 13

A displacement

- halogens will be unable to displace halide from water

Question 14

What happens to halogens structure as you travel down the group?

Answer 14

Atomic radius increases
More inner shells - more shielding
Less nuclear attraction
Less reactivity

Question 15

What is disproportionation?

Answer 15

A redox reaction where the same element is both oxidised and reduced

Question 16

Give an example of a disproportionation reaction

Answer 16

Chlorine with water
Cl2 + h2o -> HClO + HCl
0. ->. -1
0. ->. +1

Question 17

What is a test for a halide ion?

Answer 17

Precipitation reaction with aqueous silver ions

Question 18

What does qualitative analysis rely on?

Answer 18

Simple observations

Question 19

What is the carbonate rest?

Answer 19

Add dilute nitric acid
If it bubbles should be carbonate
To prove bubble through lime water will go milky

Question 20

What is the sulfate test?

Answer 20

Barium added if it’s a sulphate will make a precipitate

Question 21

What are the different colours in a halide test?

Answer 21

White - chloride
Cream - bromide
Yellow - iodide

Question 22

What do you do after the halide test to check?

Answer 22

Add ammonia to test solubility of halides
Dilute - chloride
Conc - bromide
Insoluble - iodide

Question 23

What is a barium meal?

Answer 23

A patient swallows water with barium sulphate in it which costs the inner lining of the gut allowing doctors to check for abnormalities

Question 24

What is the correc order for all the anion tests?

Answer 24

Carbonate
Sulfate
Halide

Question 25

What are the most common reactions of group 2 elements?

Answer 25

Redox reactions

Question 26

What is the test for the ammonium ion?

Answer 26

Add NaOH and ammonia released test with moist indicator paper - it will go blue