Na2S + 2 KCI = 2NaCI + K2S are the equations balanced

Asmall electric heater, immersed in 80g of water in a calorimeter of 40j/k raises the temperature from 10.5 degree celsius to 25 degree celsius in 12 minutes. using the same apparatus with 50g of oil instead of water, it is found that the temperature of oil rises from 7 degree celsius to 27 degree celsius in 10 minutes. find specific heat capacity of the oil.

If jason ii needs 15 kw of power at 300 volts to operate, what amperage of current must flow through the cable?

Whithin which type of system is neither the total mass nor the total energy conserved ? a. open b. connected c. isolated d. closed