a) 3. Oh no! The labels have fallen off a set of chemicals that you had on the lab bench. You know that

you were using solid acetic acid (CH3COOH), silicon dioxide, silver, sodium iodide and iodine. You

conduct some experiments and must identify each chemical based on the following clues: [5 marks]

Identity of Chemical

Clue

This material forms colorless crystals that have a melting point of 6610 C. It is

hard, brittle, and dissolves well in water.

This material forms crumbly crystals and has a melting point of 16.60 Celsius.

It has a low density in solid form.

This material is hard and melts at a temperature of 16100 C. It dissolves only

with difficulty in very reactive acids and doesn't conduct electricity when

molten.

This material is a solid at room temperature that sublimes at low temperatures.

This material is very malleable and is an excellent conductor of electricity.

Of the substances listed above, which :

i) the greatest hardness at room temperature?

ii) a significant amount of hydrogen bonding?

iii) delocalized electrons?_

iv) molecules held together primarily by London dispersion forces?_