500 prompts matching "What hardness is, and what causes it"
Real-life Nigeria: Chemistry in Nigerian homes and markets
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Teach me: The atom and the particles inside it
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Spot my mistake: Confusing mass number with relative atomic mass
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Real-life Nigeria: Isotopes in Nigerian medicine and agriculture
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Exam practice: The relation between configuration and position in the periodic table
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Exam practice: Sublimation and the substances that show it
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Spot my mistake: Confusing evaporation with boiling
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Exam practice: Writing and balancing a chemical equation
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Spot my mistake: Leaving out the oxidation state where it is needed
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Practice set: The Kelvin scale, and converting to it
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Spot my mistake: Forgetting to convert pressure units before calculating
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Exam practice: Percentage yield, and why it falls short of a hundred
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Practice set: The reactions of acids with metals and with carbonates
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Spot my mistake: Confusing a strong acid with a concentrated one
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Calculation practice: Titration calculations and finding an unknown concentration
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Spot my mistake: Reading a group trend as though it were a period trend
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Teach me: Mixtures and pure substances distinguished
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Exam practice: Chromatography and how it works
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Teach me: The composition and structure of water
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Exam practice: Combustion and the conditions it requires
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