Question

melting of wax is a physical change show me the experiment with diagram

Answer 1

hey.. there..
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No new substances are formed. In a burning candle, there are both physicaland chemical changes. The melting of the solid wax to form liquid wax and the evaporation of liquid wax to formwax vapour are physical changes. The burning of the wax vapour is achemical change

Answer 2

The No. of molecules present in 14 gm of N2 molecules ?

28 gm of N2 molecules contains = ${\bf 6.023 \: \times \: 10^{23} }$molecules

So, now the 14 gm of N2 molecule will contain half of 28 gm of N2 molecule

$\large{ \frac{\bf 6.023 \: \times \: 10^{23} }{2}} \: \bf$

${\bf = 3.011 \times \: 10^{23} }$

${\bf Answer : 3.011 \times \: 10^{23} \: molecules}$