AQA A LEVEL CHEMISTRY PAPER 1 Questions and Answers 100% Solved

AQA A LEVEL CHEMISTRY PAPER 1
Questions and Answers 100% Solved

Hydrogen fuel cell advantages and disadvantages + less pollution


+ greater efficiency (less heat energy wasted)

- expensive

- safety issues storing and transporting H2

- H2 produced by electrolysis of water (uses electricity)




What happens if current flows in an electrochemical cell? -reactions occur separately at each

electrode

-voltage falls to zero as reactants used up




Strong acid an acid that dissociates completely in aqueous solution




Weak acid an acid that only slightly dissociates in aqueous solution

, equivalence point of a titration The point at which the unknown solution has exactly reacted

with the known solution. Neither is in excess

Sudden vertical part of pH curve




Buffer A solution that resists changes in pH when small amounts of acid or base are added.




Reaction sodium with oxygen Yellow flame to produce white solid




Reaction of Mg with oxygen White flame to give white solid smoke




Reaction of Al with oxygen White flame to give white solid smoke




Reaction of Si with oxygen White flame to give white solid smoke




Reaction of P with oxygen White flame to give white solid smoke




Reaction of S with oxygen Blue flame to give acidic choking gas