In an experiment to determine the proportion of oxygen in air, Copper turning were packed in excess in a combustion tube connected to two syringes...

      

In an experiment to determine the proportion of oxygen in air, Copper turning were packed in excess in a combustion tube connected to two syringes of 80 cm3 each in a volume . Syringe R contained 80 cm3 of air while syringe S was closed and empty as shown.

Q216820191036.png

Air was passed over heated turnings slowly and repeatedly until there was no further change in volume. After cooling, 63.2 cm3 of air remained in syringe R.

(i) Why was copper packed in excess?

(ii) State one observation made in the combustion tube during experiment.

(iii) Give an equation for the reaction that took place in combustion tube.

(iv) Determine the percentage of oxygen used up during the experiment.

  

Answers


Maurice
(i) To react with all the oxygen in syringe R

(ii) Brown copper metal changes to black

(iii) 2Cu (s) + O2 (g) ? 2CuO (s)

(iv) Q216820191128.png
maurice.mutuku answered the question on August 16, 2019 at 08:35


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