Chlorine — damp litmus paper → bleaches (turns white).
Ammonia — damp red litmus paper → turns blue.
Exam questions — 4 questions · 10 marks
⚡ Extended questions included. Read the hint. Show all working. AI marks against the real AQA mark scheme.
1 markRf valueAQA 8462 P2 style
In a chromatography experiment, a substance travels 4.8 cm and the solvent front travels 8.0 cm. What is the Rf value?
A 1.67
B 0.6
C 3.2
D 0.4
1 markFlame testAQA 8462 P2 style
A solution gives a yellow flame in a flame test. Which ion does this indicate?
A Potassium (K⁺)
B Copper (Cu²⁺)
C Lithium (Li⁺)
D Sodium (Na⁺)
4 marksIdentify an unknown saltAQA 8462 P2 style
Describe a series of tests to identify whether an unknown white solid is sodium chloride or potassium chloride. Include the test, expected results, and conclusion for each test. (4 marks)
Hint: Flame test distinguishes Na (yellow) from K (lilac). Both are chlorides so the silver nitrate test cannot distinguish between them — use it to confirm chloride, flame test to confirm the metal.
+40 XP
1 markGas testAQA 8462 P2 style
What is the test for carbon dioxide and what result indicates its presence?
A A burning splint — it ignites with a pop
B A glowing splint — it relights
C Bubble through limewater — it turns milky/cloudy