Gwen Goldfish, a speed swimmer, loves to race around the park's pond, which is 1 kilometer around. If she can swim 20 laps around the track in 2 hours, what is her average speed?

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.

At 20°c, a sample of h2o liquid and a sample of co2 gas each have the same average kinetic energy. why is one a liquid and the other a gas at this temperature?

In a ball-and-stick molecular model, what do the sticks represent?