making aluminium cans from a block of aluminium metal
Questão 2
Questão
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.
Responda
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.
Questão 3
Questão
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?
Responda
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.
Questão 4
Questão
In Marie's experiment, where, apart from the air, did oxygen come from?
Responda
The Bunsen Burner
The lead oxide.
Questão 5
Questão
What is the name of the compound made when magnesium reacts with sulphur?
Responda
magnesium sulphate
magnesium oxide
magnesium sulphide
magnesium oxate
Questão 6
Questão
What is the process in which you break down a substance using heat?
Responda
reduction
oxidation
thermal decomposition
combustion
Questão 7
Questão
Select the word equation for the reaction between magnesium and oxygen.
Responda
magnesium + crucible = magnesium oxide
magnesium + oxygen = magnesium oxidate
magnesium + oxygen = magnesium oxide
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