Group 1

Question 1

What is another name for group 1

Answer 1

Alkali Metals

Question 2

Explain the trend for group 1 metals

Answer 2

Decreasing melting points as you go down the group but the reactivity increases

Question 3

Name 3 physical properties

Answer 3

Soft - Cut with a knife
Low densities
Low melting points

Question 4

What is the product of alkali metals reacting with water

Answer 4

Metal hydroxide and oxygen

Question 5

Write the word and symbol equation of potassium reacting with water

Answer 5

potassium + water → potassium hydroxide + hydrogen

2K(s) + 2H2O(l) → 2KOH(aq) + H2(g)

Question 6

How does lithium, potassium and sodium react with water

Answer 6

Lithium - Fizzes steadily and slowly becomes smaller until it disappears

Sodium - Fizzes rapidly, melts to form a ball and quickly becomes smaller until it disappears

Potassium - Burns with a lilac flame, quickly melts into a ball and disappears rapidly

Question 7

What is the product of alkali metals reacting with oxygen

Answer 7

Metal oxides

Question 8

State the symbol equation for sodium reacting with oxygen

Answer 8

sodium + oxygen → sodium oxide
4Na(s) + O2(g) → 2Na2O(s)

Question 9

What do alkali metals produce when they react with chlorine

Answer 9

Chlorides

Question 10

State the symbol equation for potassium reacting with chlorine

Answer 10

2K(s) + Cl2(g) → 2KCl(s)

Question 11

Why do group 1 metals become more reactive as you go down the group

Answer 11

• The atoms become larger
• The outer electron is further away from the nucleus
• The force of attraction between them decreases
• The outer electron is lost more easily