500 prompts matching "Permanent hardness and the compounds responsible"
Practice set: Working out the particles present in a given atom
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Chemistry at work: The historical models of the atom compared
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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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Project task: Making a reference card of symbols and radicals
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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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Teach me: The arrangement of the modern periodic table
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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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Chemistry at work: How the periodic table came to be arranged as it is
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Practice set: Drawing dot-and-cross diagrams for simple molecules
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Teach me: The forces that act between molecules
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Practice set: How structure determines melting and boiling point
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Exam practice: Giant and simple molecular structures compared
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Teach me: The variables that describe a gas
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