In the formation of alum, why is it appropriate to wash the sides of the
beakers/flasks with distilled water?
A. Extra water will evaporate away when the alum
crystals are formed.
B. Distilled water has potassium ions that are
needed to form the alum.
C. The alum is not soluble in water.

The minerals found in bones are deposited by living cells called

The excretory system, need answers for all: )

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.