| A | B |
|---|
| chemistry | the study of matter and how it changes |
| matter | anything that has mass and occupies space |
| element | a substance that cannot be broken down into simpler substances |
| atom | the smallest particle that has the properties of an element |
| compound | a substance made of atoms of more than one element bound together |
| molecule | smallest unit of a substance that exhibits all of the properties characteristic of that substance |
| chemical formula | the chemical symbols and numbers indicating the atoms contained in the basic unit of a substance |
| pure substance | any matter that has fixed composition and definite properties |
| mixture | combination of more than one pure substance |
| miscible | describes two or more liquids that are able to dissolve into each other in various proportions |
| immiscible | describes two or more liquids that do not mix into each other |
| pressure | the force exerted per unit area of a surface |
| viscosity | the resistance of a fluid to flow |
| energy | the ability to change or move matter |
| evaporation | the change of a substance from a liquid to a gas |
| condensation | the change of a substance from a gas to a liquid |
| sublimation | the change of a substance from a solid to a gas |
| chemical property | the way a substance reacts with others to form new substances with different properties |
| reactivity | the ability of a substance to combine chemically with another substance |
| physical property | characteristic of a substance that can be observed or measured without changing the composition of the substance |
| melting point | the temperature at which a solid becomes a liquid |
| boiling point | the temperature at which a liquid becomes a gas below the surface |
| density | the mass per unit volume of a substance |
| buoyancy | the force with which a more dense fluid pushes a less dense substance upward |
| chemical change | a change that occurs when a substance changes composition by forming one or more new substances |
| physical change | a change in the physical form or properties of a substance that occurs without a change in composition |
