| A | B |
|---|
| atom | the smallest part of an element |
| atomic mass | the sum of the number or protons and neutrons |
| atomic number | the number of protons in the nucleus of an atom |
| chemical change | a change that occurs when one or more substances are changed into a new substance with different properties (A chemical change cannot be undone by physical means.) |
| compound | a new substance made when two or more elements combine chemically |
| dissolve | when one substance is incorporated into a liquid |
| element | a substance that cannot be broken down into another substance; created by several of the same atoms |
| electron | a negatively charged particle which orbits the nucleus of an atom |
| mixture | a combination of two or more substances that do not lose their identifying characteristics when combined |
| molecule | the smallest part of a substance that still has the properties of that substance |
| neutron | a particle with no charge found in the nucleus on an atom |
| nucleus | the center of an atom, contains most of the mass of the atom by housing the protons and neutrons |
| physical change | a change that occurs when one or more physical properties of a substance are changed (Many physical changes can be undone by physical means.) |
| proton | a positively charged particle found in the nucleus of an atom |
| solute | the part of a solution that dissolves into another substance (sugar, Kool-Aid, salt, etc.) |
| solution | a mixture in which one substance dissolves in another |
| solvent | the part of a solution in which another substance dissolves (water, milk, etc.) |
| Density | measurement of how much mass is contained in a given volume of an object |
| Matter | Anything that takes up space and has mass. |
| Freezing Point | The temperature at which a liquid becomes a solid. 0 degrees Celsius and 32 degrees Fahrenheit. |
| State of Matter | physical property of a sample of matter - solid, liquid, gas, or plasma. |
| Liquid | A state of matter that has no fixed shape but that has a definite volume. |
| Plasma | a fourth state of matter distinct from solid or liquid or gas and present in stars and fusion reactors; a gas becomes a plasma when it is heated until the atoms lose all their electrons, leaving a highly electrified collection of nuclei and free electrons. |
| Periodic Table | Any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter. |
| Heat | A form of energy. This can be transferred between two systems when a difference of temperature exists. |
| Chemical Formula | a way of describing the number of atoms that make up one molecule of a compound |
| Solid | one of the states of matter; has a definite shape and volume |
| Melting Point | temperature at which a solid becomes a liquid |
| Boiling Point | Temperature at which a liquid changes into a gas. 100 degrees Celsius or 212 degrees Fahrenheit. |
| Gas | a state or phase of matter in which a substance has no definite shape or volume |
| Element | Any of the more than known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter. |
| Volume | amount of space an object takes up |
