250 prompts matching "Calculating the quantity of dye needed for a given fabric"
Exam practice: The reactivity series and how it is established
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Explain back: The allotropes shown by some non-metals
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Chemistry at work: Metalloids, and where they sit between the two
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Exam practice: The tests that identify the common non-metal gases
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Explain back: Metals and their extraction reviewed
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Explain back: How a catalyst lowers the activation energy
I have just studied how a catalyst lowers the activation energy in my SS2 Chemistry class.
Calculation practice: Writing and using the equilibrium constant expression
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Explain back: Thermochemistry and reaction rates reviewed
I have just studied thermochemistry and reaction rates reviewed in my SS2 Chemistry class.
Exam practice: Solutions, water and the atmosphere reviewed
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Exam practice: How alkenes react by addition across the double bond
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Explain back: Condensation polymerisation and the products it gives
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Calculation practice: Working out the repeating unit from a polymer structure
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Chemistry at work: The petrochemicals made from oil and gas
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Explain back: Why the chosen conditions are a compromise
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Explain back: The soap and detergent industry in Nigeria
I have just studied the soap and detergent industry in Nigeria in my SS2 Chemistry class.
Exam practice: The paint and textile industries in Nigeria
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Spot my mistake: Predicting ionic character from electronegativity difference
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Practice set: Giant structures and simple molecular structures compared
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Teach me: Oxidation defined by oxygen, by hydrogen and by electrons
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Practice set: Assigning oxidation numbers in compounds and in ions
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