Sc17a - Alkali Metals

Question 1

What are properties of alkali metals ?

Answer 1

-Low M.P
-Soft and easy to cut
-reactive with metals so must be stored in oil.

Question 2

How does lithium react with water

Answer 2

Lithium + water -)> bubbles fiercely on the surface.

Question 3

How does sodium react with water

Answer 3

Sodium + water -> melts into a ball and fizzes about the surface.

Question 4

How does potassium react with water.

Answer 4

Potassium + water -> bursts into lilac flames and flies about the surface

Question 5

(Seneca) what happens when an alkali metal reacts with water ?

Answer 5

Enough energy is released to melt the metal and the metal floats on the surface of the water.

Question 6

What happens when a halogen reacts with a metal ?

Answer 6

When a metal atom transfers its outer electron to a non-metal atom (like a group 7 atom), salts are formed.

The result is a compound where all the ions have a full outer shell.

Question 7

Reactivity of halogens down the group.

Answer 7

As you go down the group, the halogens become less reactive. This is because:The atoms gain more electron shells.The outer electron shell is further from the nucleus.The attraction between the nucleus and the electron (to be gained from another element) decreases.

Question 8

What type of ion do halogens form ?

Answer 8

Halogens form negative ions