Topic 6- Groupings in the periodic table (paper 2)

Question 1

what are properties of alkali metals?

Answer 1

• soft
• low melting points

Question 2

What happens to lithium in water?

Answer 2

• moves around on the surface
• lots of fizzing (effervescence) → hydrogen gas
• solution becomes alkaline

Question 3

what happens to sodium in water?

Answer 3

• moves around on the surface
• lots of fizzing (effervesence) → hydrogen gas
• melts in the heat of the reaction
• solution produced is alkali

Question 4

what happens to potassium in water?

Answer 4

• moves around on the surface
• lots of fizzing (effervesence) → hydrogen gas
• melts in the heat of the reaction
• flame produced as the potassium is hot enough to ignite the hydrogen
• alkaline solution

Question 5

word equation for the reaction of alkali metals and water

Answer 5

alkali metal + water → metal hydroxide + hydrogen

Question 6

physical state and colour of chlorine at room temperature

Answer 6

green gas (poisonous)

Question 7

physical state and colour of bromine at room temperature

Answer 7

red-brown liquid that gives off an orange vapour (poisonous)

Question 8

physical state and colour of iodine at room temperature

Answer 8

dark grey crystalline solid → purple vapour when heated (poisonous)

Question 9

what is the test for chlorine gas?

Answer 9

bleaches damp blue litmus paper red and then white

Question 10

what is the trend of reactivity in the halogens?

Answer 10

more reactive going up the group

Question 11

what type of reaction are halogen displacement reactions?

Answer 11

redox reactions

Question 12

what change could be seen to suggest a displacement reaction has occured?

Answer 12

colour change of solution

Question 13

what are properties of noble gases

Answer 13

• inert
• low density

Question 14

what does inert mean?

Answer 14

unreactive