2(a) - Group 1

Question 1

What are the elements in group one called?

Answer 1

ALKALI METALS: Group 1 Metals that commonly include Lithium, Sodium and Potassium

Question 2

How doe group 1 metals react similar with water?

Answer 2

• Group 1 Metals will react similarly with Water as they are a family of Elements called Alkali Metals
• They will react vigorously with Water to produce an Alkaline Metal Hydroxide and Hydrogen Gas

Question 3

What are the similarities in the reactions of lithium, sodium and potassium with water provide evidence for their recognition as a family of elements?

Answer 3

1. fizzing (hydrogen is produced)
2. metal floats and moves around on the water
3. metal disappears

In each case, a metal hydroxide solution is produced.

These similarities in the reactions provide evidence that the 3 metals are in the same group of the Periodic Table (i.e. have the same number of electrons in their outer shell).

Question 4

How does lithium react with water?

Answer 4

• fizzing (hydrogen gas is released)
• lithium floats and moves around on the water
• lithium disappears

Question 5

How does sodium react with water?

Answer 5

The reaction of sodium and water is more vigorous than lithium’s:

• fizzing (hydrogen gas is released)
• sodium floats and moves around on the water
• sodium melts into a silver-coloured ball
• sodium disappears

Question 6

How does potassium react with water?

Answer 6

The reaction of potassium and water is more vigorous than sodium’s:

• fizzing (hydrogen gas is released)
• potassium floats and moves around on the water
• catches fire with a LILAC flame
• potassium disappears

Question 7

What is the reactivity of the group 1 metals?

Answer 7

When the group 1 metals react with air they oxidise, showing a similar trend in reactivity as we go down the group of the Periodic Table.

Therefore, as we go down group 1 (increasing atomic number), the elements become more reactive: Li