A branch of chemistry that studies chemical phenomena from a physical and mathematical perspective. Physical chemistry includes chemical thermodynamics, kinetics, spectroscopy, quantum chemistry, and statistical mechanics. A system for reporting very small or very large numbers by writing the number as a decimal number between 1 and 10, multiplied by a power of 10. 0.000323 is written in scientific notation as 3.23 x 10 -4 . Compare with hypothesis .
Theories are well-established explanations for experimental data.
To become established, the theory must experimentally tested by many different investigators. The study of poisons, including identification, isolation, biological effects, mechanism of action, and development of antidotes. Compare with independent variable and dependent variable . A quantity that can have many possible values. In designing experiments, variables that affect measurements must be identified and controlled.