Tick the boxes by the chemical changes.
boiling water in an electric kettle
burning petrol in a car engine
diluting orange juice with water
making aluminium cans from a block of aluminium metal
John dropped a glass bottle of blue copper sulphate crystals. The bottle broke and the glass mixed with the crystals. Suggest how John or a teacher could clear up the mixture safely, without cutting themselves.
Add water so the crystals dissolve, sweep up the glass and mop up the water.
Sweep up the mixture and put in bin.
Add acid so the mixture dissolves and mop it up.
Marie mixed 5g of carbon with 5g of lead oxide. She heated the mixture strongly for 15 minutes in a fume cupboard. After 15 minutes, Marie found some shiny beads in the mixture. How should Marie test to see if the beads are metal and if they are metal, what metal are they most likely to be?
Check if the beads are sonorous and carbon.
Check if the beads are sonorous and magnesium.
See if they conduct heat or electricity and magnesium.
See if they conduct heat or electricity and lead.
In Marie's experiment, where, apart from the air, did oxygen come from?
The Bunsen Burner
The lead oxide.
What is the name of the compound made when magnesium reacts with sulphur?
magnesium sulphate
magnesium oxide
magnesium sulphide
magnesium oxate
What is the process in which you break down a substance using heat?
reduction
oxidation
thermal decomposition
combustion
Select the word equation for the reaction between magnesium and oxygen.
magnesium + crucible = magnesium oxide
magnesium + oxygen = magnesium oxidate
magnesium + oxygen = magnesium oxide
