6. The heat of vaporization of a liquid is 1,340 Joules per gram. What is the minimum number of Joules needed
to change 40.0 grams of the liquid to vapor at the
boiling point?
A) 33.
B) 1,340
C) 3,280
D) 53,600
7. How many joules of heat are absorbed to raise the
temperature of 435 grams of water at 1 atm from
25°C to its boiling point, 100.°C?

Suppose that during that icy hot lab 65,000 j of energy were transferred to 450 g of water at 20°c what would have have been the final temperature of the water

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.

Why is the melting of ice a physical change ?