arrange the following organic solvents in order of decreasing polarity, and give their structures when doing so. acetone – heptane – acetic acid – toluene – methanol

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.

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?