How many Joules of heat are gained by a 32.5g silver necklace as the temperature rises from 33.2t to 76.0C? Specific heat of silver is 0.235g/J°C

Which of these best describes the scientific process

Compare and contrast physical changes with chemical changes.

1) which of the following is the best example of a physical change? a) sugar dissolving in tea b) firefly glowing 2) in the combustion of ethane, what is/are the reactants? c2h6 + o2 ==> co2 + h2o a) c2h6 and o2 b) co2 and c2h6