Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
18th August 2022
- 1Quantitative Chemistry
A student measures the mass of a beaker of hydrochloric acid and marble chips as they react and finds it falls. Explain why.
- 2Moles, Formulae and Equations
Calculate the mass of 0.25 mol of sodium hydroxide, NaOH. (Na = 23, O = 16, H = 1)
- 3Concentration, Yield and Atom Economy
Give the formula for atom economy.
- 4Chemical Changes
A student reacts 2.4 g of magnesium with excess dilute hydrochloric acid: Mg + 2HCl -> MgCl2 + H2. Relative atomic mass of Mg = 24. Calculate the number of moles of hydrogen gas produced.
- 5Reactivity, Acids and Salts
Why is aluminium extracted by electrolysis rather than by reduction with carbon?
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