The Bohr model of the atom represented electrons located around the nucleus in rings of energy, 1-7. If an electron went from n = 2 to n = 3 level and then falls from n = 3 to n = 2 energy is given off as light. What do we call the electron's energy state after the fall?

Exit what is the density of an object having a mass of 5.0 g and a volume of 45.0 cm3?

Scientists are often interested in knowing the molar heat of combustion – the heat released during the combustion of one mole of a substance. use the periodic table to find molar masses. how many moles of ethanol are present in the sample?

Ascientist wants to know how individual lions within a pride interact with each other in their own environment. to do this, the scientist sedates and tags all of the lions within a pride. then, he places several remotely-controlled video cameras near the lions' den and performs an observational field study. he collects continuous video footage over the span of one year, analyzes the video, and then forms conclusions based on his observations.