Questions
Differentiate: roasting and calcination
Differentiate: mineral and ore
Ores are oxidized after concentration. Why?
All ores are minerals but all minerals are not ores.
What is the refraction of light?
What is critical angle?
A bucket contains 16kg of water at 25oC. Calculate the temperature of the mixture formed when 4 kg of water at 80oC is mixed with it. (Here, the heat lost to the surroundings is neglected)
If a substance of mass 500g needs 7938 J of heat to increase its temperature from 100oC to 226oC, calculate its specific heat capacity.
If 2kg of paraffin needs 4200J of heat to increase its temperature through 10oC, calculate the amount of heat required to increase the temperature of 4kg of paraffin from 20oC to 40oC.
The specific heat capacity of iron is 460 J/kg. Calculate the heat released by an iron sphere of mass 5kg while cooling it from 430oC to 30oC.