500 prompts matching "The origin and composition of crude oil"
Exam practice: Evaporation to dryness and its limitations
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Project task: Separating sand from salt at home
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Teach me: Crystallisation, and how it purifies a solid
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Quiz me: Simple distillation and what it separates
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Chemistry at work: Distillation in the Nigerian refining industry
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Quiz me: Paper chromatography and how it is carried out
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Spot my mistake: Reading a chromatogram without marking the solvent front
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Real-life Nigeria: Chromatography in Nigerian food and drug testing
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Practice set: Working out the particles present in a given atom
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Spot my mistake: Giving an ion the same configuration as its parent atom
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Teach me: Why chemists use symbols rather than words
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Quiz me: The symbols for the first thirty elements
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Spot my mistake: Writing a formula without balancing the charges
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Chemistry at work: The international agreement behind chemical symbols
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Quiz me: Word equations and chemical equations compared
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Calculation practice: Checking the charge balance in an ionic equation
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Project task: Converting a set of full equations into ionic form
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Quiz me: Periods, groups and blocks
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Practice set: Predicting valency from the group number
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Spot my mistake: Placing hydrogen wrongly in the periodic table
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