6 marksFoundation and Higher
A student wants to investigate how the volume of sodium hydroxide solution added to 25 cm³ of dilute hydrochloric acid affects the temperature change.
Plan an investigation the student could carry out.
Include the variables to control and how to make the results as accurate as possible.
[6 marks]4 marksFoundation
Some substances are listed below.
Copper, carbon dioxide, air, sodium chloride.
.1Which substance is an element?
[1 mark] .2Which substance is a mixture?
[1 mark] .3Give the number of different elements in the formula
CaCO3. .4A student has a mixture of sand and water. Choose the best method to get the sand.
[1 mark] 4 marksFoundation and Higher
Aluminium oxide is an ionic compound. It contains
Al3+ and
O2− ions.
.1Write the formula of aluminium oxide.
[1 mark] .2Describe the structure of aluminium oxide.
[3 marks] 6 marksFoundation and Higher
A student wants to make pure, dry crystals of copper sulfate from copper oxide (an insoluble black powder) and dilute sulfuric acid.
Plan a method the student could use.
In your answer, explain the reason for each step.
[6 marks]4 marksFoundation and Higher
A student heats 2.40 g of magnesium ribbon in an open crucible. It all reacts to form 4.00 g of magnesium oxide.
2Mg+O2→2MgO.1Calculate the mass of oxygen that reacted with the magnesium.
[1 mark] .2The student says: "The mass went up, so mass was not conserved."
Explain why the student is wrong.
[2 marks] .3The student repeats the experiment in a sealed container full of air and weighs the whole container. Predict what happens to the total mass.
[1 mark] 