Topic 2 Y10

Question 1

What is a halogen?

Answer 1

An element in group 7 and always gains 1 electron and has a negative charge.

Question 2

What is the trend in halogens?Why?

Answer 2

The reactivity, boiling point and melting point decreases, due to the nucleus being further away from the outer electron shell so there is less pull between the atoms, but the intermolecular forces get stronger, the further you go down but they generally have low melting points.

Question 3

What colour and state of matter are the halogens at room temperature?

Answer 3

Bromine is a liquid and red/ brown.
Iodine is a solid and dark grey.
Fluorine is a gas and yellow.
Astatine is a solid and black.
Chlorine is a gas and green.

Question 4

Test for chlorine.

Answer 4

Hold a piece of damp blue litmus paper or damp universal indicator paper over it and it will go red temporarily then stay white.

Question 5

What group are the noble gases?

Answer 5

0

Question 6

What are properties of noble gases?

Answer 6

• Inert.
• Low density, boiling point.
• Weak inter-molecular forces.
• Small.

Question 7

What are the uses of some noble gases?

Answer 7

Helium- Balloons and airships as it is less dense than air and none flammable.

Argon- Used when melding metal as it is more dense than air so the metal doesn’t get oxidised.

They were used in bulbs so the metal wires weren’t oxidised.`

Question 8

What group are alkali metals?

Answer 8

1

Question 9

What are properties of alkali metals?

Answer 9

Low boiling and melting points and weak inter-molecular forces.