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Chemistry Vocab List
| Term | Definition |
|---|---|
| Periodic Table | A chart of the chemical elements, arranged by grouping elements with similar properties. |
| Reactants | Substances that may undergo a chemical change in an experiment. |
| Chemical Change | A reaction that creates a new substance. Evidence by color change, making heat,gas,or a solid |
| Physical Change | When a substance changes size, shape or phase but is STILL the original substance. |
| Matter | Anything that contains mass or takes up space. |
| Compound | A pure substance composed of 2 or more elements. |
| Dichotomus Key | A tool used to categorize substances by asking questions that only have 2 choices. |
| Solid | The phase of matter that has a definite shape and volume. |
| Physical Properties | Characteristics of a substance that can be tested and/or observed. |
| Meniscus | The curvature in a liquid noticed inside a graduated cylinder. We use the bottom of it to measure accurately. |
| Participate | A new solid that is formed in a chemical reaction. |
| Particle | A very small piece of matter, such as an atom. |
| Element | One of a group of substances that cannot be separated into simpler substances by chemical means. |
| Conservation Of Mass | Rule that states that in a closed system, even after physical and chemical changes occur, the total amount of the substances you started with equals the total amount of the substances you end with. |
| Open System | An experimental set-up in which mass or energy can be lost or gained from its surrounding environment. |
| Closed System | When reactions take place without the influence of outside factors. Nothing is lost or gained. |
| Liquid | The phase of matter where the atoms take the shape of its container. |
| Acid | A substance with a pH less than 7, has a sour taste and keeps or turn litmus paper pink. |
| Gas | The phase of matter where the atoms fill the shape and volume of its container. |
| Base | A substance with a pH greater than 7, feels slippery, tastes bitter, and keeps or turns litmus paper blue. |
| Solubility | Capable of being dissolved or liquified. |
| Atom | Smallest part of any substance that contains protons, electrons, and neutrons. |
| Melting Point | Temperature at which a substance changes solid to liquid. For water its 0 Celsius. |
| Litmus Paper | AN indicator tool, made of paper, that changes color in the presence of an acid or a base. |
| Boiling Point | Temperature at which a substance changes from a liquid to a gas. For water its 100 Celsius. |
| Neutral | Term used for a substances whose pH is 7, water is an example. |
| Mixture | A combination of substances that can be separated by physical means. |
| pH (scale) | A way of expressing how acidic or basic a substances is on a scale from 1-14. |
| Pure Substance | Any single type of matter that cannot be separated by physical means. |
| Blue | This color on litmus paper indicates a base. |
| Freezing Point | Temperature at which a substance changes from a liquid to a solid. For water its 0 Celsius. |
| Red/Pink | This color on litmus paper indicates an acid. |
| Polymer | A long molecule made of a paper chain of smaller, more simpler molecules. |
| Exothermic | A chemical reaction which releases heat. |
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apeele18
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