Chemistry A (9-1) - Gateway Science Suite J248 9-1: Elements, compounds and mixtures Topical Past Paper Questions
OCR GCSE (9-1) Chemistry A (9-1) - Gateway Science Suite J248 (9-1) past-paper questions on Elements, compounds and mixtures, free. This topic is frequently examined across 6 exam sessions. Sign in for the full topic-segregated question bank and AI worksheets.
Sample questions
The first member of the alkane homologous series is methane, $ CH_{4} $. (a) State the formula of the alkane with 10 carbon atoms. [1] (b) Write the balanced symbol equation for the complete combustion of methane. [2] (c) Methane can also undergo incomplete combustion. Carbon mon…
Group 7 elements (halogens) react with halides in solution. Chlorine reacts with potassium bromide to form potassium chloride and bromine. $ \text{Cl}_2(g) + 2\text{KBr(aq)} \rightarrow 2\text{KCl(aq)} + \text{Br}_2(aq) $ (a) Describe what you would observe in the reaction. [1] (…
A scientist uses chromatography and melting points to investigate the purity of three samples of a painkiller, A, B and C. The scientist compares the three samples with a pure sample of the painkiller. - The scientist also compares the melting points of the three samples to the p…
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