Group 2

Question 1

Ionisation energies

Answer 1

• decrease down group
• as you go down they have extra electron shells
• extra inner shells shield outer electrons from attraction of the nucleus
• outer electrons further away from nucleus so it gradually reduces the electrostatic attraction between and outer electrons
• easier to remove outer electron so ionisation energy decreases

Question 2

reactivity

Answer 2

• increases down the group

- easier to lose electrons on the outer shell

Question 3

Reaction with water

Answer 3

• Hydroxides

- M + 2H2O arrow M(OH)2+H2

Question 4

Burns in oxygen

Answer 4

• forms oxides
• 2M+O2 arrow 2MO
• solid white oxides

Question 5

reaction with chlorine

Answer 5

• forms chlorides
• solid white chlorides
• M+CL2 arrow MCL2

Question 6

Oxide and hydroxides

Answer 6

• oxides react rapidly with water to form metal hydroxides so they dissolve
• hydroxide ions OH- are strongly alkaline
• BeO exception
• Be(OH)2 insoluble

Question 7

Bases

Answer 7

• neutralise dilute acids

- forming solutions of corresponding salts

Question 8

oxides

Answer 8

• MO+H20 arrow M(OH)2

- MO+2HCl arrow MCl2+H2O

Question 9

Hydroxides

Answer 9

• M(OH)2+H20 arrow M(OH)2

- M(OH)2+2HCl arrow MCl2+H2O

Question 10

Solubility trends

Answer 10

• Sulphates increase

- hydroxides decrease