Group 2

Question 1

Group 2 reactivity

Answer 1

Increases down group

Question 2

Why

Answer 2

Atomic radius increases, more shells

Shielding increases

Nuclear attraction decreases

Increased nuclear charge is outweighed by increase in Shielding/radius

Electrons more easily removed

Ionisation energy decreases

Question 3

Melting point

Answer 3

Decreases down group

Weaker metallic bonding

Metal ions have a larger ionic radius

So lower melting points

Question 4

+ oxygen

Answer 4

Metal + oxygen > metal oxide

Question 5

+ water

Answer 5

Metal + water > metal hydroxide + hydrogen

Question 6

+ dilute acid

Answer 6

Metal + dilute acid > salt + hydrogen

Question 7

Uses

Answer 7

Antacid - milk of magnesia, Mg(OH)2, neutralises acid, alkaline

Antacid - limestone/calcium carbonate, CaCO3, base, neutralises acid

Slaked lime - agriculture, Ca(OH)2, neutralises acidic soil

Question 8

pH

Answer 8

Increases down group

More alkaline

Question 9

HCl + Mg(OH)2

Answer 9

2HCl + Mg(OH)2 > MgCl2 + 2H2O

Question 10

Acid + base

Answer 10

> salt + water

Question 11

HCl + CaCO3

Answer 11

2HCl + CaCO3 > CaCl2 + H2O + CO2

Question 12

Why does reactivity increase down the group (3)

Answer 12

Atomic radius increases

More electron shielding

Weaker nuclear attraction towards electron in the outer shell

Ionisation energy decreases; less energy required to remove electron

Question 13

Identify metal

Answer 13

Mol = vol/24

Mol= gram / RAM

Question 14

Experiment repeated using same mass of a group 2 metal from further down the group

Predict whether volume of hydrogen produced would be greater, less or equal to volume produced in first experiment

Answer 14

Less as fewer moles of metal reacting