Daily Practice · GCSE Science

Daily Practice - GCSE Science

16th May 1999

5 questions · GCSE · 584 questions in this band

1
Moles, Formulae and Equations
Calculate the mass of 0.25 mol of sodium hydroxide, NaOH. (Na = 23, O = 16, H = 1)
2
Concentration, Yield and Atom Economy
Give the formula for atom economy.
3
Chemical Changes
Explain why aluminium cannot be extracted from aluminium oxide by heating with carbon.
4
Reactivity, Acids and Salts
Why is aluminium extracted by electrolysis rather than by reduction with carbon?
5
Electrolysis
Explain why solid sodium chloride does not conduct electricity, but molten sodium chloride does.

You are looking at an earlier sheet. Today's sheet is the one that adds a day.

Your run is kept in this browser only, and there is no account.

Any date always gives the same five questions, so a sheet can be set again or shared. All of May 1999, including the monthly compilation PDF.