Group7

1. Starter
 These are the definitions; but what are
the key words?
1. This is the other name for all the Group 7
elements.
2. These particles are what controls the
chemistry.
3. The temperature where a chemical turns
from a solid to a liquid, or a liquid to a solid.
4. When a gas turns to a solid or a solid to a
gas without turning into a liquid.

2. Objectives
 To understand that elements of Group 7
have similar properties.
 To be able to recall the displacement
reactions of Group 7.
 To be able to explain how the reactivity
and properties of Group 7 changes.

3. questions
 Answer question 7 on page 157
 Answer question 1,2 on page 160
 http://www.youtube.com/watch?v=fo7s-go6j2Y

4. Halogen displacement
Potassium
chloride
Potassium
bromide
Potassium
iodide
Cl2(aq)
Br2(aq)
I2(KI)
Salt soln
Halogen

5. Plenary
 Match the halogen to its use.
Antiseptic.
Pesticides; photographic film.
Teflon; toothpaste.
Killing microbes; solvents; bleach;
pesticides; weed killers.

6. Plenary
 Match the halogen to its use.
Antiseptic.
Pesticides; photographic film.
Teflon; toothpaste.
Killing microbes; solvents; bleach;
pesticides; weed killers.