CE Rev - Chem 3

What colour is Copper?

• Black

• Blue

• White

• Pinky-brown

Complete:

silver + hydrochloric acid -->

• silver chloride + hydrogen

• silver chloride

• silver oxide

• no reaction

What colour is sulfur?

• yellow

• blue

• white

• green

Complete:

sodium + water -->

• hydrated sodium oxide

• sodium oxide

• sodium hydroxide + hydrogen

• sodium hydroxide

Which is the most reactive metal?

• Copper

• Calcium

• Aluminium

• Zinc

What is the best way to extract aluminium from its ore?

• electrolysis

• heat with carbon

• thermal decomposition

• chromatography

What colour is wet cobalt chloride?

• pink

• blue

• white

• green

Complete:

copper oxide + sulfuric acid -->

• copper sulfate + carbon dioxide

• copper sulfate + water

• copper sulfate

• copper oxide + sulfur dioxide

What colour change would occur with the decomposition of copper carbonate?

• blue to white

• green to black

• black to green

• pink to blue

What colour is Iron Oxide?

• Grey

• Black

• Red-brown

• White