Chemical Changes lesson 3 Student questions

1In this reaction the metal oxide has been reduced by carbon. Explain in term of oxygen what is meant by reduction. (1 mark)

2For the reaction between copper oxide and carbon:

aState what has been oxidised in this reaction. Explain your answer.(2 marks)

bWrite a word equation and a balanced symbol equation for the reaction.

(2 marks)

3For the reaction between lead oxide and carbon:

aState what has been oxidised in this reaction. Explain your answer.(2 marks)

bWrite a word equation and a balanced symbol equation for the reaction.

(2 marks)

4Metals that are less reactive than carbon can be extracted from their oxides by heating with carbon.Explain why magnesium cannot be extracted from magnesium oxide by this method. (1 mark)

5Many everyday items are made from iron. Haematite is anoreofiron.Haematitecontainsironoxide,Fe2O3.

aWhatisthemeaningofthetermore?(1 mark)

bIroncanbeproducedbyreactingironoxidewithcarboninablastfurnace.Explainwhycarboncanbeusedtoextractironfromironoxide. (1 mark)

cWhattypeofreactionproducestheiron?(1 mark)

dThewordequationforthisreactionis:

Ironoxidecarbon→ironcarbondioxide

Completeandbalancethesymbolequationforthisreaction.

____Fe2O3____C→____________(2marks)

6Partofareactivityseriesis:

decreasingreactivity / / sodium
calcium
magnesium
aluminium
zinc
iron
hydrogen
copper

aCarbonisusedinblastfurnacestoobtainironandzincfromtheiroxides,butelectrolysishastobeusedtoobtainaluminiumfromitsoxide.Drawanarrowonthereactivityseriesabovetoshowwherecarbonfitsintotheseries. (1 mark)

bPredictthemethodofextractionusedtoobtaincalciumfromitsoreandexplainyouranswer. (2 marks)

cTheformulaforzincoxideisZnO.Writeabalancedequationfortheextractionofzincintheblastfurnace. (2 marks)

Highertier questions

1aExplainintermsofelectronswhathappenswhencopper(II)ionsareconvertedtocoppermetal. (1 mark)

bWritedownthehalfequationwhichrepresentsthischange. (1 mark)

cArethecopper(II)ionsoxidisedorreduced?Explainyouranswer(1 mark)

2Copper(II)oxidecanbereducedbyhydrogenaswellasbycarbon,formingcoppermetalandwater.

aConstructabalancedsymbolequationforthisreaction.(1 mark)

bUnderlineinredthespeciesthat isoxidisedandunderlineinbluethespeciesthat isreduced.

(1mark)