What would you use to add up molecules or atoms and see if they are equal before and
after a reaction?

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

Which subatomic particle has a negative charge