Describe how the plum pudding model of the atom was replaced by the nuclear model.
24 marks
Explain why the reactivity of Group 1 metals increases down the group.
34 marks
Describe how sodium and chlorine atoms form an ionic compound. You may use dot-and-cross diagrams.
42 marks
Calculate the relative formula mass (Mr) of CaCO₃. (Relative atomic masses: Ca = 40, C = 12, O = 16)
54 marks
Explain how iron is extracted from iron(III) oxide in a blast furnace and why carbon can be used.
66 marks
Describe how to prepare a pure, dry sample of copper(II) sulfate crystals from copper(II) oxide and dilute sulfuric acid.
74 marks
Predict the products at each electrode in the electrolysis of copper(II) chloride solution and write the half equation at the cathode.
83 marks
Explain the difference between exothermic and endothermic reactions, with an example of each.
93 marks
An atom of potassium has mass number 39 and atomic number 19. Give the numbers of protons, neutrons and electrons.
103 marks
Describe what you would see when potassium is added to water and write a balanced equation.
113 marks
Explain why sodium chloride has a high melting point and conducts electricity when molten but not when solid.
122 marks
Calculate the relative formula mass (Mr) of Mg(OH)₂. (Relative atomic masses: Mg = 24, O = 16, H = 1)
133 marks
Explain why aluminium is extracted by electrolysis rather than reduction with carbon.
143 marks
Explain the difference between a strong acid and a weak acid.
154 marks
Explain the products of electrolysis of sodium chloride solution (brine).
164 marks
Use the bond energies (kJ/mol) H–H 436, Cl–Cl 243, H–Cl 432 to calculate the energy change for H₂ + Cl₂ → 2HCl.
172 marks
An element has two isotopes: mass 35 (75%) and mass 37 (25%). Calculate its relative atomic mass.
184 marks
Explain why chlorine displaces bromine from potassium bromide solution and write an ionic equation.
193 marks
Explain why methane has a low boiling point.
202 marks
Calculate the relative formula mass (Mr) of H₂SO₄. (Relative atomic masses: H = 1, S = 32, O = 16)
213 marks
Write the ionic equation for the reaction of zinc with copper(II) sulfate and identify what is oxidised.
221 mark
What is the pH of a neutral solution?
Finished?
Answer every question to finish (22 left), or finish when the time’s up.
Score 0 / 70 · 0 of 22 marked
This paper is written by Plasmo in the style of the AQA GCSE Combined Science exam. It is not a past paper and is not produced or endorsed by the exam board.