C2.4 - Group7: The Halogens (Finished)

Question 1

Give 2 properties of the halogens

Answer 1

• They are toxic
• They have coloured vapours
• They are poor conductors of electricity
• They have low melting and boiling points

Question 2

The melting and boiling points of the Halogens do what going down the group?

Answer 2

Increase

Question 3

The Halogens all exist as molecules made up of pairs of atoms. These are called diatomic molecules. How are the atoms in each pair joined together?

Answer 3

Through covalent bonds(sharing electrons)

Question 4

The halogens all have ______ electrons in their outer shell, so they want to ____ an electron to achieve a full outer shell. When they react with non-metals they gain an electron by _______ a _____ of electron(s) with another atom. When they react with metals they _____ an electron to form a __ charged ___.

Answer 4

Seven, gain, sharing, pair, gain, 1-, ion

Question 5

Create a balanced symbol equation for the reaction of Iodine and hydrogen.

Answer 5

I2 + H2 –> 2IH

Question 6

What will a more reactive halogen do to a less reactive one in a solution of one of it’s salts?

Answer 6

It will displace the less reactive halogen from a solution of one of its salts

……..

Question 7

The reactivity of the Halogens increases going up or down the group?

Answer 7

Up

Question 8

How do you carry out test-tube displacement reaction to find the more reactive halogen?

Answer 8

You use a solution of one of the Halogens and a solution of one with its salt in water. When mixed, the colour of the solution will be that of the less reactive halogen left in the solution as the aqueous molecule.

Question 9

Create a balanced symbol equation for:
Chlorine + potassium bromide –> potassium chloride + bromine
Include state symbols if possible

Answer 9

Cl2(aq) + 2KBr(aq) –> 2KCl(aq) + Br2(aq)

Question 10

Do you actually understand anything about displacement reactions?

Answer 10

Probably not

Question 11

How will halogens react with metals?

Answer 11

Through ionic bonds, gaining an electron to form -ive ions (1- charge)

Question 12

Why will the less reactive halogen be the colour of the water in a displacement reaction?

Answer 12

The less reactive one is left in the solution as the aqueous molecule