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O level Chemistry

Chemistry Calculations (O level)

Chemistry calculations (O level) This post is about answering O level chemistry calculations questions which are part of stoichiometry. To fully understand these calculations you should be familiar with: how to use the periodic table relative molecular mass molar mass moles concentration valency These questions are compatible with Zimsec O level Chemistry and Combined science. …

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O level Chemistry Questions and Answers(5)

Question 1 (a) A student prepared a blue solution, P, by adding black copper (II) oxide powder to nitric acid as shown below.’ (i) Name two chemical substances in the blue solution. (ii) State two observations made by the student. (iii) Write a balanced chemical equation for the reaction. (b) Write a balanced chemical equation …

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O level Chemistry Questions and Answers(4)

Question 1 Choose from the following substances to answer the questions below . copper(II) chloride chlorine ethanoic acid hydrochloric acid manganese(IV) oxide platinum potassium dichromate(VI) sodium chloride sulphuric acid vanadium(V) oxide Each substance can be used once, more than once or not at all. Name a substance which (a) is a catalyst in the Contact …

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O level Chemistry Questions and Answers(3)

Question 1 Ethanol, CH3CH2OH, is a liquid fuel. Ethanol can be manufactured either from glucose, C6H12O6, or from ethene. (a) Briefly describe the manufacture of ethanol from glucose. Include the balanced equation in your answer. (b) (i) Draw the displayed formula for ethene. (ii) Name the substance that reacts with ethene to make ethanol. (iii) …

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O level Chemistry Questions and Answers(2)

Question 1 (a) Copper can be extracted from molten copper chloride using electrolysis. The apparatus is shown below: (i) State whether this process for the extraction of copper involves a chemical change or a physical change. Explain your answer. [1] (ii) Identify the two ions present in the electrolyte and describe, in terms of electrons, …

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O level Chemistry Questions and Answers(1)

O level Chemistry Questions and Answers(1) This question is for O ‘Level Chemistry. It covers concepts from atomic structure, electronic configuration, periodic trends and atomic bonding. Question 1 The table below shows the electronic arrangements of seven elements, A to G. Element Electronic arrangement A 2.1 B 2.6 C 2.8 D 2.8.1 E 2.8.6 F …

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