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| Question | Answer |
|---|---|
| Matter | Anything that has mass and takes up space. |
| Chemistry | The study of the properties of matter and how matter changes. |
| Substance | A single kind of matter that is pure and has a specific set of properties. |
| Physical Property | A characteristic of pure substance that can be observed without changing into another substance. |
| Chemical Property | A characteristic of a substance that describes its ability to change into different substances. |
| Element | A substance that cannot be broken down into any other substances by chemical or physical means. |
| Atom | The basic particle from which all elements are made; the smallest particle of an element that has the properties of that element. |
| Chemical Bond | The force of attraction that holds two atoms together. |
| Molecule | A neutral group of two or more atoms held together by covalent bonds. |
| Compound | A substance made of two or more elements chemically combined in a specific ration, or proportion. |
| Chemical Formula | Symbols that show the elements in a compound and the ratio of atoms. |
| Mixture | Two or more substances that are together in the same place but their atoms are not chemically bonded. |
| Weight | The measure of the force of gravity acting on an object. |
| Mass | The amount of matter in an object. |
| International System of Units | A system of measurement based on multiples of ten and on established measures of mass, length, and time. |
| Volume | The amount of space that matter occupies. |
| Density | The ratio of the mass of a substance to its volume (mass divided by volume). |
| Physical Change | A change that alters the form or appearance of material but does not make the material into another substance. |
| Chemical Change | A change in which one or more substances combine or break apart to form new substances. |
| Law of Conservation of Mass | The principle that the total amount of matter is neither created nor destroyed during any chemical or physical change. |
| Temperature | How hot or cold something is; a measure of the average energy of motion of the particles of a substance. |
| Thermal Energy | The total energy of the motion of all the particles of an object. |
| Endothermic Change | A change in which energy is absorbed. |
| Exothermic Change | A reaction that absorbs energy. |
| Chemical energy. | A form of energy that is stored in chemical bonds between atoms. |