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Properties of Matter
Unit 2 8th Science 2025
| Term | Definition |
|---|---|
| Matter | anything that has mass and takes up space |
| Atoms | the smallest part of a chemical element |
| Molecules | two or more atoms held together by a chemical bond |
| pure substance | made of only 1 type of atom or molecule |
| element | a pure substance represented by a chemical symbol |
| element symbol | one or two letter abbreviation for an element. It can have only one capitol letter |
| compound | a combination of 2 or more bonded elements |
| mixture | a combination of 2 or more substances |
| properties | measurable characteristics that can be observed |
| heterogenous mixture | consists of visible individual particles that are physically separate |
| homogenous mixture | two or more substances that are evenly distributed and have no visible individual substances |
| physical change | change in shape, size, state of matter and can possibly be reversed |
| chemical change | when a reaction forms a new substance with different properties |
| chemical formula | uses numbers and elements to give information about a chemical compound |
| chemical equation | representation of a chemical reaction using symbols for substances |
| chemical reaction | a change in matter that produces a new substance |
| photosynthesis | the process of using light energy to make glucose |
| subscript | a small number written after an element in a chemical formula which tells how many atoms of that element are present in a compound |
| coefficient | the number in front of a symbol that represents the number of molecules present |
| law of conservation of mass | matter cannot be created nor destroyed |
| 6 evidences of a chemical change | color change, bubbles/gas, light, precipitate, odor, heat change |
| precipitate | when a solid is created from combining two liquids |
| parts of a chemical equation | Reactants, a yield sign, and products |
| chemical potential energy | energy stored within a substance that can release during a chemical rection |
| Bond | the force that holds atoms together to form a molecule. Attraction between water molecules. |
| Alkaline | any substance that has a pH higher than 7. Also called a basic. |
| Acid | has a pH lower than 7 |
| Base | has a pH higher than 7. |
| Neutral | a solution with a pH of 7. an example is water and salt mixed with water. |
| pH | measures how acidic or basic liquids are based on free hydrogen and hydroxyl |
| Adhesion | when a substance is attracted to another substance or molecule |
| Cohesion | when like substances or molecules are attracted to each other. |
| Surface Tension | force acting on the surface of a liquid caused by particle attraction |
| Closed System | doesn't allow matter in or out of the system. energy can still flow. |
| Indicator | substance which changes color when a solution touches it. It tells the pH of a solution. |
| Metalloids | nonmetallic element that has some metal characteristics |
| nonmetal | does NOT conduct electricity or heat well, is not hard or malleable |
| Corrosion | slow destruction of metal by a chemical reaction |
| metal | can conduct electricity/heat, is shiny, strong, hard, and malleable |
Created by:
Vblackburn
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