Group I: Alkalis

Question 1

What are group 1 metals are called

Answer 1

Alkali metals

Question 2

What is produced when group 1 metals react with water?

Answer 2

alkali + water ➝ metal hydroxide + hydrogen

Question 3

Why do group 1 metals react similarly?

Answer 3

They react in similar way as THEY HAVE 1 ELECTRON IN THEIR OUTER SHELL

Question 4

What are observations when lithium reacts with water?

Answer 4

floats, bubbles, dissolves

Question 5

Reactivity of group I with water (6 marks)

Answer 5

Reactivity INCREASES down the group

• electron is FURTHER AWAY FROM THE POSITIVE NUCLEUS.
• there’re more ELECTRON SHELLS
• so, greater ELECTRON SHIELDING
• WEAKER attraction between the nucleus and outer electron
• so electron is MORE EASILY LOST (forming a 1+ ion)

Question 6

physical properties of group I:
melting point
density
reactivity with water

Answer 6

down the group

• melting point DECREASES
• density: INCREASES
• reactivity with water: INCREASES