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6.6CDE 7.6BC 8.6E
6th,7th & 8th Matter & Energy STAAR Vocabulary
| Term | Definition |
|---|---|
| atom | the smallest particle of matter that has distinct physical and chemical properties; consists of a nucleus which contains protons and neutrons and an electron cloud which contains electrons |
| element | a pure substance that is made up of one type of atom |
| matter | substance that occupies space, has mass, and is composed of microscopic particles |
| physical property | observable characteristic of matter that can be used to identify particular materials |
| density | a physical property that measures how tightly packed the particles of a substance are compared to the volume of the substance; the relationship between mass and volume |
| property | characteristic of matter that can be used to identify particular materials |
| substance | a particular kind of matter with uniform properties; can be seen, touched, and/or measured |
| evidence | data that supports a hypothesis or an argument and is observable through the senses or technology |
| precipitate | an insoluble solid substance that is formed during a chemical change and occurs after mixing liquids |
| chemical formula | the unique combination of chemical symbols and subscripts that describe which and how many of each element are bonded together in a compound |
| compound | a pure substance that is made up of two or more different elements in a specific ratio |
| periodic table | an organizational chart of all the known elements on Earth, organized based on the physical and chemical properties of each |
| solution | a substance in which a solid, liquid, or gaseous substance is evenly distributed (or dissolved) within a liquid or sometimes a gas or solid |
| chemical change | a type of change in which a new substance is made from one or more previous substances; occurs during a chemical reaction; a change where the atoms of the original substances are rearranged to make new elements and/or compounds |
| chemical equation | describes a chemical reaction and includes all of the reactants and all of the products of the reaction |
| chemical reaction | a chemical change that occurs when two or more substances combine to form a new substance; the rearrangement of atoms to produce new compounds |
| closed system | a physical system that does not allow transfer of matter in or out, although energy can flow into and out of the system |
| law of conservation of mass | in chemical changes, the total mass of the materials does not change (nor does the type and number of atoms); the total mass of the reactants is equal to the total mass of the products |
| mass | the amount of matter in a substance, measured in grams or kilograms |
| photosynthesis | the chemical process by which plants and other photosynthetic organisms produce their own source of energy (food) using energy from sunlight to convert carbon dioxide and water into oxygen and glucose (food) |
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Fullerscience
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