Chemistry revision

Alkali metals

• Soft

• Hard

• Low density

• High density

Any substance with a density less than ...... will float in water and react vigorously with water.

• 2.0 grams

• 1.0 milligrams

• 1.0 grams

• 2.0-kilo grams

Mercury exists as a ....... at room temperature

• Liquid

• Gas

• Solid

Non-metal carbon:

• Coal

• Ruby

• Diamond

• Graphite

Diamond melts at

• Melts, 3720

• Sublimes, 3270

• Sublimes, 3720

• Melts, 3270

Graphite is

• A bad thermal and electrical conductor

• A good electrical conductor

• A good thermal conductor

• A good thermal and electrical conductor

Diamond is the ..... known substance

• Hardest

• Softest

Alkali similarities with metals

• A bad thermal and electrical conductor

• A good thermal and electrical conductor

• Metals

• ductile

• malleable

Alkali different from metals

• Low density

• High density

• low melting points

• high melting points