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Chemistry
| Term | Definition |
|---|---|
| Pure substance | A sample of matter that has definite chemical and physical properties |
| Mixture | A combination of two or more pure substances that are not chemically bonded - substances held together physically |
| Element | A pure substance that cannot be separated into simpler substances by physical or chemical means |
| Compound | A pure substance composed of two or more different elements joined by chemical bonds |
| Homogenous mixture | Molecules mixed up in an even distribution - will not separate over time |
| Heterogenous mixture | Molecules mixed up in an uneven distribution - will eventually separate over time |
| Chemical formula | Shows the number and kinds of atoms that make up a molecule |
| Molecule | A group of two or more atoms held together by chemical bonds |
| Atom | The smallest unit of an element that maintains the properties of that element |
| Coefficient | The number placed in front of a chemical symbol or formula - tells how many molecules of a compound are involved in a chemical reaction |
| Subscript | A small-sized number on the bottom right of the chemical symbol that refers to the number of atoms of the element in a chemical formula |
| Law of Conservation of Mass | Law that states that matter cannot be created or destroyed - the mass/number of atoms on the reactant side must be equal to the mass/number of atoms on the product side |
| Balanced equation | A chemical equation that follows the Law of Conservation of Mass - equal atoms on both sides |
| Unbalanced equation | A chemical equation that does not follow the Law of Conservation of Mass - unequal atoms on both sides |
| Chemical equation | A description of a reaction using element symbols and chemical formulas |
| Chemical reaction | A process in which atoms of one or more substances rearrange to form one or more new substances |
| Reactants | A substance that takes part in and undergoes change during a chemical reaction |
| Products | A substance that is produced due to the rearrangement of atoms in a chemical reaction |
| Want Extra Credit? | Email your teacher a funny science meme or joke, and get 5 points of extra credit towards whatever assignment you want! |
Created by:
anjali.soni
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