Daily Practice · GCSE Science

Daily Practice - GCSE Science

11th March 1999

5 questions · GCSE · 584 questions in this band

1
Structures, Properties and Nanoparticles
Why does simple molecular carbon dioxide have a much lower melting point than giant covalent silicon dioxide?
2
Quantitative Chemistry
Calculate the number of moles in 20 g of calcium carbonate. (Mr = 100)
3
Moles, Formulae and Equations
State the value of the Avogadro constant and what it counts.
4
Concentration, Yield and Atom Economy
Convert a concentration of 0.20 moles per cubic decimetre of NaOH into grams per cubic decimetre. (Mr = 40)
5
Chemical 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.

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