CHEMISTRYY PAPER 6 VARIENT 2 OCT/NOV 2012 DISCUSSION

[To2a Bahaa]

GUYSSSS!
What was the answer for why was mass of zinc oxide different ? And why did we reweigh?

 

[NKPyo]

Some of the mass may have been evaporated in the air due to the heat and it was reweighed for getting more accurate reading by taking out the average of the two readings.

 

[To2a Bahaa]

Some of the mass may have been evaporated in the air due to the heat and it was reweighed for getting more accurate reading by taking out the average of the two readings.

thanks