When one mole of a certain compound is formed from its elements under standard conditions, it absorbs 85 kiloJoules of heat. A correct conclusion from this statement is that the reaction has a OPTIONS:
- >equal to +85 kJ/mole
- >H equal to -85 kJ/mole
- >H equal to +85 kJ/mole
- >equal to -85 kJ/mole

What is impossible to do with a hypothesis

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 ?