A student claims that discovering the electron was enough evidence for the modern nuclear model of the atom.
Evaluate the claim using the development of atomic models.
[6 marks]OCR Gateway GCSE Chemistry June 2023 Paper 3
5 questions on this paper's topics
32:001 of 5
Copper oxide is reduced by hydrogen: . A process must produce 12.8 g copper. : Cu = 64, O = 16, H = 1.
.1
Calculate the minimum mass of copper oxide needed if conversion is complete.
[4 marks].2
Calculate the mass of hydrogen that reacts with this copper oxide.
[2 marks]A student says: "Evaporating a molecular liquid makes smaller molecules because the bonds break."
Explain what happens during evaporation and evaluate the student claim.
[6 marks]A student electrolyses concentrated aqueous potassium chloride using inert electrodes in a teacher-controlled demonstration with suitable ventilation. Potassium is more reactive than hydrogen.
.1
Predict the electrode products and explain the difference from molten potassium chloride.
[3 marks].2
Explain how charge is carried through the aqueous electrolyte and through the external metal wires.
[2 marks]A beaker becomes colder when two substances react. A student sketches a reaction profile with products below reactants and no energy barrier.
Explain how the profile should be corrected and what each correction means.
[4 marks]