⚡ Show all working — the AI marks against the AQA mark scheme. Method marks awarded for correct working even if the final answer is wrong.
3 marksBalancing equationsAQA 8462 P1 style
Balance the following symbol equation: __ Al + __ O₂ → __ Al₂O₃. Include state symbols if: aluminium is solid, oxygen is gas, aluminium oxide is solid. (3 marks)
Hint: Balance Al first (Al₂O₃ has 2 Al), then O (Al₂O₃ has 3 O). Scale up as needed. Add state symbols last.
+30 XP
1 markCompound definitionAQA 8462 style
Which of the following is a compound?
A Oxygen (O₂)
B Salt water
C Water (H₂O)
D Air
3 marksSeparation methodAQA 8462 style
A student has a mixture of sand and salt in water. Describe how they could obtain pure, dry salt from this mixture. (3 marks)
Hint: Two stages: (1) remove the insoluble sand by filtration, (2) remove the water from the salt solution by evaporation.
+30 XP
1 markState symbolsAQA 8462 style
In the equation: NaOH(aq) + HCl(aq) → NaCl(aq) + H₂O(l), what does (aq) mean?
A The substance is a gas
B The substance is dissolved in water (aqueous solution)