Physical chemists are focused on understanding the physical properties of atoms and molecules, the way chemical reactions work, and what these properties reveal. Their discoveries are based on ...

Melting and freezing are both physical changes ... see if you can spot what is used in the middle of the word equation to show that a reaction has occurred. Chemical reactions happen all around ...

where Q is the heat of combustion. In this reaction, atoms are conserved and the equation balances for each of the species. The reaction is a stoichiometric reaction, and the coefficients multiplying ...

due to an intrinsically safe physical process; No production of radioactive waste with long half-lives; and No or only a modest proliferation risk. Energy obtained from fusion and fission reactions is ...