Group 2 Reactions

Question 1

reaction, alkalinity and observation:

MgO + water

Answer 1

MgO + H2O → Mg(OH)2

• cloudy and white
• least alkaline

Question 2

reaction, alkalinity and observation:
CaO + water
and observations

Answer 2

CaO + 2H2O → Ca(OH)2 + H2

• cloudy and white
• alkaline

Question 3

reaction, alkalinity and observation:

BaO + water

Answer 3

BaO + H2O → Ba(OH)2

• cloudy and white
• most alkaline

Question 4

reaction and vigour:

magnesium hydroxide + hydrochloric acid

Answer 4

Mg(OH)2 + 2HCl → MgCl2 + H2

least vigor

Question 5

reaction and vigour:

calcium hydroxide + hydrochloric acid

Answer 5

Ca(OH)2 + 2HCl → CaCl2 + 2H2O

some vigor

Question 6

reaction and vigour:

barium hydroxide + hydrochloric acid

Answer 6

Ba(OH)2 + 2HCl → BaCl2 + 2H2O

most vigor

Question 7

Mg + water observation

Answer 7

After several minutes, some bubbles of hydrogen form on its surface

Question 8

Ca + water observation

Answer 8

reacts vigorously
exothermic reaction (FLASH)
bubbles of hydrogen gas (POP)
white precipitate (of calcium hydroxide)
alkaline solution (also of calcium hydroxide)

Question 9

Mg on bunsen burner observation

Answer 9

blue flame -too bright to look at without blue plastic