Alkali metals, Halogens, Noble gases

Question 1

What group are alkali metals found?

Answer 1

1

Question 2

True or false:

Alkali metals have low melting points compared to other metals.

Answer 2

True.

Question 3

True or false:

Alkali metals are soft.

Answer 3

True.

Question 4

The reactivity increases as you go ___ the group.

Answer 4

Down.

Question 5

What group are halogens found?

Answer 5

7.

Question 6

Name the states and colours of the following elements at room temperature:
Chlorine
Iodine 
Bromine
Fluorine

Answer 6

Chlorine - yellow/green gas
Iodine - grey solid
Bromine - brown liquid
Fluorine - pale green gas

Question 7

Halogens need one more electron to gain a full outer shell, so they form ions with a charge of ___.

Answer 7

-1.

Question 8

True or false:

Fluorine is the least reactive halogen and iodine is the most.

Answer 8

False, it’s the other way round.

Question 9

True or false:

Halogens are diatomic.

Answer 9

True.

Question 10

When halogens react with hydrogen they form hydrogen halides and when these form ______ when in water.

Answer 10

Acids.

Question 11

When a more reactive halogen reacts with a metal halide what does the more reactive halogen do?

Answer 11

Displace the less reactive one.

Question 12

What group are noble gases found?

Answer 12

0.

Question 13

What makes them inert and why are they called noble/inert?

Answer 13

They are not reactive because they already have a full outer shell.

Question 14

Name 2 uses of noble gases.

Answer 14

Any 2 from: -

• Inside filament lamps instead of air to stop the hot filament reacting with oxygen and burning away.
• Argon can be used in fire extinguishing systems because it’s non-flammable.
• Helium has a low density so it’s used in balloons and blimps/airships.
• Neon is used in fluorescent lamps and advertising displays as it produces a red light when a current is passed through the tube.