Daily Practice · GCSE Science

Daily Practice - GCSE Science

21st January 1999

5 questions · GCSE · 584 questions in this band

1
Quantitative Chemistry
A student measures the mass of a beaker of hydrochloric acid and marble chips as they react and finds it falls. Explain why.
2
Moles, Formulae and Equations
Calculate the mass of 0.25 mol of sodium hydroxide, NaOH. (Na = 23, O = 16, H = 1)
3
Concentration, Yield and Atom Economy
Give the formula for atom economy.
4
Chemical Changes
Calculate the number of moles of sodium hydroxide in 200 cm3 of a 0.500 mol/dm3 solution.
5
Reactivity, Acids and Salts
Why is aluminium extracted by electrolysis rather than by reduction with carbon?

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