| A | B |
|---|
| chemical change | a change that occurs when a substance changes its composition by forming a new substance |
| molecule | a combinaton of 2 or more atoms chemically joined together |
| compound | a substance made of 2 or more different elements chemically joined |
| atom | the smallest particle with the properties of a particular element |
| heterogeneous mixture | a mixture composed of more than one substance; it is NOT uniform thoughout |
| homogeneous mixture | a mixture that is uniform throughout |
| mixture | a combination of more than one pure substance that can be separated by physical means |
| element | simplest type of matter |
| matter | anything that has mass and takes up space |
| chemistry | the study of matter, its composition, properties and the changes it undergoes |
| kinetic energy | the energy of motion |
| physical change | a CHANGE in the physical form of a substance without changing its composition |
| density | mass per unit volume of a substance |
| chemical property | the way a substance reacts with other substances to form new substances with different properties |
| physical property | a property that can be observed or measured without changing the composition of the substance |
| pure substance | matter with a fixed composition and definite properties; this cannot be physically separated |
