Chemistry A H032: Amount of substance Topical Past Paper Questions
OCR AS Chemistry A (H032) past-paper questions on Amount of substance, free. This topic is frequently examined across 5 exam sessions. Sign in for the full topic-segregated question bank and AI worksheets.
Sample questions
Aqueous hydrogen peroxide, $ H_{2}O_{2} $(aq), gradually decomposes to produce water and oxygen. $$ \mathrm{2H_{2}O_{2}(aq) \rightarrow 2H_{2}O(l) + O_{2}(g) } \quad \Delta H=-196\mathrm{kJ} \mathrm{mol^{-1}} \quad \mathrm{Equation} \quad 4.1 $$ The rate of decomposition of $ H_{…
This question is about titanium (atomic number 22) and its compounds. a) Titanium exists as a mixture of five isotopes. A chemist analyses a sample of titanium using mass spectrometry. The results are shown in the table below. (i) Calculate the relative atomic mass of titanium in…
This question is about the analysis of unknown compounds. (a) Scandium (atomic number 21) reacts with oxygen to form an oxide of scandium. A student carries out an experiment to determine the empirical formula of the scandium oxide. A diagram of the apparatus used by the student…
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