Group 2

Question 1

trend in atomic radius down the group

Answer 1

increases
as more shells of electrons
so bigger atoms

Question 2

trend in melting point down the group

Answer 2

decrease
size increases - metallic bonding weakens
so greater distance between positive ions + delocalised electrons
so electrostatic force weakens

Question 3

trend in 1st ionisation energy

Answer 3

• outer electrons = further from nucleus
• outer electrons= more shielded + repelled by inner electrons
• less attraction to nucleus

Question 4

reactivity down the group with oxygen

Answer 4

inreases

Question 5

G2… with O2

Answer 5

burns

Question 6

Mg + o2 produces?

Answer 6

• 2Mg + O2 👉 2MgO
• a white flame
• a solid with high mp due to ionic bonding

Question 7

how does Mg react with o2 without a flame?

Answer 7

slowly

Question 8

mg + steam produces?

Answer 8

• magnesium oxide + hydrogen

- Mg burns with bright white flame

Question 9

equation for mg + steam

Answer 9

Mg (s) + H2O (g) 👉 MgO (s) + H2(g)

Question 10

mg + warm water produces?

Answer 10

• magnesium hydroxide
• slower reaction than with steam
• no flame

Question 11

equation for mg + water

Answer 11

Mg + 2 H2O 👉Mg(OH)2 + H2

Question 12

other g2 metals react with …..water?

Answer 12

cold

Question 13

g2 + water produces

Answer 13

hydroxides

Question 14

does reactivity with water increase or decrease down the group?

Answer 14

increase

Question 15

observations of reactions with water + intensity (4)

Answer 15

• fizzing
  
  • more vigorous down the group
• metal dissolving
  
  • faster down the group
• solution heating up
  
  • more down the group
• calcium has white ppt
  
  • less down the group

Question 16

write the Ba + H20 with state symbols

Answer 16

Ba + 2 H2O (l) 👉 Ba(OH)2 (aq) + H2(g)

Question 17

if soluble, what do hydroxides make the water?

Answer 17

alkaline