Group 1 And 7

Question 1

Properties of Alkali metals

Answer 1

Soft-can be cut with knife.
Shiny
Reactive- so stored in oil.
Less dense than water-floats on water.

Question 2

Trends of alkali metals

Answer 2

Low Melting and boiling point.
Density increases , not linealy.
As you go down the metals are more reactive.
Easier to lose one electron as you go down because it is less attracted to the nucleus.

Question 3

Reactions of Alkali metals with water

Answer 3

Li-bubbles and fizzing,moves around and floats.
Na-sphere shape,fizzing, moves around and floats.
K-sphere shape,fizzing,moves around,floats and fire.

Question 4

Reactions of Alkali metal with oxygen

Answer 4

Makes oxides

Metal + oxygen = metal oxide

Question 5

Trends of halogens

Answer 5

Melting and boiling points increase as you go down.

As you go down the size of molecules increase so there are more intermolecular forces that are harder to overcome.