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 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 investigates what is produced when aqueous solutions of copper chloride and sodium chloride are electrolysed using inert electrodes.
Plan an investigation to find the products at each electrode for both solutions.
Include how you would identify any gases.
[6 marks]4 marksFoundation and Higher
Sodium chloride melts at 801 °C. It does not conduct electricity when solid, but it does when molten.
.1Explain why sodium chloride has a high melting point.
[2 marks] .2Explain why molten sodium chloride conducts electricity but solid sodium chloride does not.
[2 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] 