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]Edexcel GCSE Chemistry November 2020 Paper 1F
5 questions on this paper's topics
27:001 of 5
Silicon dioxide (silica) melts at 1710 °C. Poly(ethene) softens at about 120 °C. Methane boils at −162 °C.
Explain the differences in these temperatures.
Refer to the structure and bonding of each substance.
[6 marks]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]Some metals are added to solutions of metal sulfates.
.1
Which two mixtures react? Tick two boxes.
[2 marks].2
Explain, in terms of ions, why magnesium is more reactive than zinc.
[2 marks]Sodium chloride melts at 801 °C. It does not conduct electricity when solid, but it does when molten.
.1
Explain why sodium chloride has a high melting point.
[2 marks].2
Explain why molten sodium chloride conducts electricity but solid sodium chloride does not.
[2 marks]