Which term below represents a pure substance that can be separated chemically, but cannot be separated physically, that is made up of two or more different atoms? molecule, chemical bond, mixture, element

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

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.

Asubstance is a good conductor of electricity which of the following best explains a probable position of the substance in a periodic table