GROUP 1

Question 1

Group 1 ( ALKALI METALS ) reaction w. WATER

Answer 1

! React vigorously —> produces metal hydroxide solution - ALKALINE + HYDROGEN

—> FIZZING identified

Eg.

2Na (s) + 2H2O (l) —> 2Na OH (aq) + H2 ( g)

Question 2

REACTION w. AIR ( OXYGEN ) - this is why they TARNISH

Answer 2

Eg.

Li2 —> Lithium Oxide

Na2O —> Sodium oxide. Na2O2 —> Sodium peroxide

K2O2 —> Peroxide KO2 —-> potassium superoxide

Question 3

ALKALI METALS - properties

Answer 3

• soft
• highly reactive —> stored in OIL
• low melting point
• as you go DOWN —> MORE REACTIVE

Li < Na < K

Question 4

REACTION w. Water observations

Answer 4

Li - fizzes + floats + disappears

Na - forms a ball - moves around surface - fizzes rapidly before disappearing

K - floats and moves around very quickly on surface of water - SELF IGNITES - ignites hydrogen GAS - LILAC FLAME

Question 5

Loss of electrons

Answer 5

• as you go down - outermost electron is FURTHER form NUCLEUS
• attraction between OUTERMOST electron & NUCLEUS
  —> decreases

! Gets weaker as it goes down —> more reactive