Boiling refers to which phase change?
a. gas to solid
b. liquid to gas
c. solid to liquid
d. liquid to solid

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Which is an example of a highly unstable isotope that is often used in fission reactions?

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.