500 prompts matching "Variable oxidation state, and why it arises"
Exam practice: The links between chemistry and the other sciences
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Practice set: Fertiliser, cement and soap manufacture in Nigeria
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Practice set: Melting and boiling, and the energy each requires
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Explain back: Writing the formula of a compound from valencies
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Practice set: Converting between mass, moles and number of particles
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Exam practice: Naming acids and the salts derived from them
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Exam practice: The ideal gas equation and the gas constant
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Exam practice: The trend in metallic and non-metallic character
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Practice set: Hard and soft water, and the causes of hardness
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Practice set: The properties and uses of oxygen
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Real-life Nigeria: Air pollution in Nigerian cities
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Practice set: Acids, bases and salts reviewed
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Exam practice: The periodic table and separation techniques reviewed
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Exam practice: Identifying the oxidising and the reducing agent in a reaction
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Practice set: Drawing dot-and-cross diagrams
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Exam practice: Heat of reaction, of neutralisation and of combustion
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Practice set: The effect of temperature and surface area on rate
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Exam practice: Catalysts and how they work
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Explain back: The structure that gives each allotrope its properties
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Practice set: Carbonates and hydrogencarbonates
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