Daily Practice - GCSE Science
Biology, chemistry and physics recall, definition and calculation, drawn from every strand.
13th April 2021
- 1Quantitative Chemistry
Calculate the Mr of calcium carbonate, CaCO3. (Ca = 40, C = 12, O = 16)
- 2Moles, Formulae and Equations
Define the limiting reactant.
- 3Concentration, Yield and Atom Economy
Why do companies prefer reactions with a high 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
State what is observed when magnesium ribbon is added to copper sulfate solution.
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