11.2 S Block (Group 1 + Group 2)

Question 1

What are Group 1 and Group 2 metals known as?

Answer 1

Alkali metals

Question 2

What are the two trends for the metallic groups?

Answer 2

1. Elements become more metallic as you go down the group (most reactive at the bottom).
2. Elements become less metallic as you go across the period. (Group 1 is more reactive than Group 2).

Question 3

Physical Properties

Answer 3

1. Very reactive. Never found in uncombined state.
   Similarities: All have similar arrangements of electrons in their atoms.
   Differences: As you go down the group the size of the atom increases.

Question 4

Group 2 reactions with water

Answer 4

1. Vigorous as you go down the group.
2. Forms hydroxide and hydrogen.
3. Metal = water=Metal hydroxide + hydrogen.

Question 5

Group 2 Metal Oxides reacting with water

Answer 5

1. React with water to produce an alkaline solution of hydroxide.
2. Metal Oxide + Water=Metal hydroxide
3. React with acids so act as bases.
4. Metal Oxide+ Acid= Salt + Water

Question 6

Group 2 Hydroxides reacting with acid

Answer 6

1. Hydroxides become more soluble as you go down the group.
2. OH- makes it Alkaline.
3. Metal hydroxide + Acid= Salt + Water.

Question 7

What is the state of hydroxides dependent on?

Answer 7

The solubility of the metal hydroxide so it can either be (s) or (aq)

Question 8

Metal Carbonates

Answer 8

1. Thermal decomposition.
2. Forms oxide and releases carbon dioxide.
3. Metal Carbonate =Metal oxide + carbon dioxide.
4. Thermal stability increases as you go down the group (more difficult to decompose, needs more heat).

Question 9

Group 2 Down (Mg-Ba) Reacting

Answer 9

Water: More vigrous reaction
Thermal Stability: More stable.
Solubility (OH): Increase
pH of (OH): More alkaline, higher pH
Solubility of Carbonate: Decrease