Experimental techniques and chemical analysis
147 past-paper questions on Experimental techniques and chemical analysis · examined 2023–2025.
20258 questions
The graph shows the volume of hydrogen produced over time in a chemical reaction. A student uses a stop-watch. Which other item of apparatus is used to take measurements to produce this graph?
A student uses paper chromatography to identify the food dyes in a coloured sweet, S. The student uses four known food dyes, W, X, Y, and Z, and ethanol as the solvent. The chromatogram obtained is shown. Which statements are correct?
An aqueous cation reacts with aqueous sodium hydroxide to form a white precipitate. The precipitate is insoluble in excess sodium hydroxide. What is the aqueous cation?
A piece of damp red litmus paper is put into a test-tube of gas. The litmus paper turns white. Which gas is in the test-tube?
Which item of apparatus is used to measure exactly 26.3 cm3 of a liquid?
A mixture containing an aqueous salt and an insoluble salt is filtered. Which row describes X and Y?
Pure ethanol has a melting point of –114 °C and a boiling point of 78 °C. What are the melting and boiling points of a sample of ethanol with glucose dissolved in it?
Describe a test to identify the presence of iodide ions, I–, in a sample of water.
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