Solid carbon dioxide (CO2), also known as dry ice, changes into a gas at room temperature. An
image of this change can be seen below.
Is this an example of a physical change? Why
or why not?

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

Find the mass in grams of 1.37x1020 particles of h3po4

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.