What happens in all chemical changes?

• A gas is produced.

• Heat energy is given out.

• Elements change into a compound.

• One or more new substances are formed.

Metals like aluminium are used to make cooking pots because they are …

• brittle and good conductors of heat.

• malleable and good conductors of heat.

• brittle and poor conductors of heat.

• malleable and poor conductors of heat.

The reaction between calcium and oxygen forms:

• calcium oxate.

• calcium oxide.

• calcium oxygen.

• calcium carbonate.

What is the missing substance in the equation below? copper carbonate and sulfuric acid --> copper sulfate +

• carbon

• copper oxide + carbon

• oxygen

• carbon dioxide + water

Which list contains only typical properties of metals?

• good conductor of heat, brittle, low melting point

• poor conductor of heat, strong, high melting point

• good conductor of electricity, strong, high melting point

• poor conductor of electricity, weak, low melting point

Which list contains only non-metal elements?

• oxygen, nitrogen, argon, silicon

• chlorine, oxygen, sulfur, iron

• bromine, helium, carbon, air

• gold, silver, platinum, mercury

All metals are …

• solids.

• strong.

• brittle and easily broken.

• conductors of electricity.

When scratched to remove its surface, which of the following metals will react most quickly with the air?

• aluminium

• copper

• lead

• tin

What must be present for iron to rust?

• water alone

• oxygen alone

• air alone

• water and oxygen

Which of the following metals is so reactive it is stored under oil?

• aluminium

• copper

• magnesium

• sodium