500 prompts matching "Water pollution and its sources in Nigeria"
Practice set: Percentage yield and percentage purity
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Exam practice: Empirical and molecular formula from composition
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Spot my mistake: Forgetting to balance the equation before using mole ratios
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Practice set: The characteristic chemistry of Groups 1, 2, 7 and 0
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Spot my mistake: Predicting a trend in the wrong direction
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Practice set: A full theory paper under examination conditions
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Exam practice: A full objective paper under examination conditions
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Spot my mistake: The time-management mistakes candidates make
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Quiz me: A rapid sweep across every examined chemistry topic
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Practice set: The past questions most worth working through
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Exam practice: A final mixed paper before the examination
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Quiz me: Atomic number, mass number and isotopes
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Spot my mistake: Filling the 3d sublevel before the 4s
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Calculation practice: Calculating relative atomic mass from isotopic data
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Project task: Building a configuration chart for the first thirty elements
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Practice set: The trend in electronegativity
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Spot my mistake: Explaining a group trend by nuclear charge alone
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Calculation practice: Comparing two elements using their trend data
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Project task: Plotting a periodic property against atomic number
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Spot my mistake: Describing a polar covalent bond as ionic
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