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​. 13.A student investigated the relation41ip between the volume ofa beaker containing a buming candle and the time for which it continued to bum. She set up the Qpamtus as shown in the diagram, Fig. 1.1. beaker burning candle Fig. 1.1 The student lit the candle and placed a 100 cm3 beaker over it. She used a stop clock to find out how long the candle burned She then repeated the experirnent with beakers of volumes 500 cm3 md 1000 cm3. burling timesforthe candles are shown on the stopclocks in Fig. 1.2. 100 cm3 beaker 500 cm3 beaker 1 OOOcm3 beaker (c) After the candle flmne had gone out the student added limewater to the 100 cm3 beaker. limewater tumed milky. Name the gas present in the beaker which caused the limewater to turn milky. (d) The student also noted that afew dmplets of a colourless liqrid collected on the inside of the beaker as the candle was What test could the student do to show the liquid contained water ald what is the result ofthis test? result (e) Explain how the products named in (c) and (d) were formed by the buming ofthe candle

The solution is as follows:

(c) The gas turns lime water milky is carbon dioxide. 

(d) When we bought burning candle near the droplet, it extinguishes. Thus, it is water droplet.

(e) The products are formed due to the following reactions:

     CnHx (s) + n O2 (g)  n CO2(g)  + H2xO

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