inorganic chemsitry - group 1 (lithium, sodium and potassium) & group 7 (chlorine, bromine and iodine)

Question 1

reaction between alkali metals and water

Answer 1

metal + water –> metal hydroxide + hydrogen

Question 2

observations in the reaction between alkali metals and water

Answer 2

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

Question 3

3 things that happen when lithium reacts with water

Answer 3

1. fizzing (hydrogen gas released)
2. lithium floats and moves through the water
3. lithium disappears

Question 4

4 things that happen when sodium reacts with water

Answer 4

1. fizzing (hydrogen gas is released)
2. sodium floats and moves around on the water
3. sodium melts into a silver-coloured ball
4. sodium disappears

Question 5

4 things that happen when potassium reacts with water

Answer 5

1. fizzing (hydrogen gas is released)
2. potassium floats and moves around on the water
3. catches fire with a LILAC flame
4. potassium disappears

Question 6

what happens as we go down group 1?

Answer 6

the elements become more reactive

Question 7

chlorine colour and state at room temperature

Answer 7

green gas

Question 8

bromine colour and state at room temperature

Answer 8

red-brown liquid

Question 9

iodine colour and state at room temperature

Answer 9

grey solid

Question 10

Fluorine colour and state at room temperature

Answer 10

yellow gas

Question 11

astatine colour and state and room temperature

Answer 11

black solid

Question 12

what happens as you go down group 7

Answer 12

the elements become less reactive

Question 13

what happens in a displacement reaction between halogens

Answer 13

the more reactive halogen will replace the less reactive halogen
e.g. chlorine + potassium bromide –> potassium chloride + bromine