Daily Practice · GCSE Science

Daily Practice - GCSE Science

13th January 1997

5 questions · GCSE · 584 questions in this band

1
Quantitative Chemistry
A sealed flask containing 12.0 g of reactants is shaken and a reaction occurs. What is the total mass afterwards?
2
Moles, Formulae and Equations
Calculate the number of moles in 88 g of carbon dioxide. (Mr = 44)
3
Concentration, Yield and Atom Economy
State two reasons why a percentage yield is less than 100 percent.
4
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.
5
Reactivity, Acids and Salts
Complete: acid + metal carbonate gives ...

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