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8 Science Vocab 1
8th grade 1st 6 weeks. Element, molecule, equation
| Question | Answer |
|---|---|
| Law of Conservation Method | a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system |
| Physical Change | a change from one state to another without a change in chemical composition; usually reversible |
| Chemical Change | the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance; usually irreversible |
| Element | simplest form of matter; can't be broken down |
| Chemical Formula | a representation of a substance using symbols for its constituent elements |
| Element (Diatomic) Molecule | elements that exist in pairs in nature; molecules composed only of two atoms, of either the same or different chemical elements |
| Compound Molecule | a compound regarded as a union of molecules retaining their identities |
| Chemical Equation | a representation of a chemical reaction using symbols of the elements to indicate the amount of substance, usually in moles, of each reactant and product |
| Chemical Reaction | a process in which one or more substances are changed into others |
| Reactants (in a chemical equation) | any substance that undergoes a chemical change in a given reaction, esp. a substance that is present at the start of the reaction |
| Products (in a chemical reaction) | a substance obtained from another substance through chemical change |
| Coefficient ( in a chemical reaction) | a number placed in front of a term in a chemical equation to indicate how many molecules (or atoms) take part in the reaction |
| Subscript (in a chemical reaction) | Gives information as to the number of atoms of that kind there are in one molecule. Refers to the position and size of a text |
| Ionic Compound | a compound held together by Ionic bonds;A chemical bond formed between two ions with opposite charges. Ionic bonds form when one atom gives up one or more electrons to another atom. These bonds can form between a pair of atoms or between molecules |
| Metallic Compound | A metallic compound is a compound that contains one or more metal elements |
| Synthesis | Formation of a compound from simpler compounds or elements |
| Decomposition | separation into constituents by chemical reaction |
| Single Replacement | A chemical reaction in which an element replaces one element in a compound. |
| Double Replacement | a chemical reaction where two elements in different compounds trade places |
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