8th grade 1st 6 weeks. Element, molecule, equation
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Law of Conservation Method | a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system
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| Physical Change | a change from one state to another without a change in chemical composition; usually reversible
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| 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
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| Element | simplest form of matter; can't be broken down
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| Chemical Formula | a representation of a substance using symbols for its constituent elements
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| Element (Diatomic) Molecule | elements that exist in pairs in nature; molecules composed only of two atoms, of either the same or different chemical elements
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| Compound Molecule | a compound regarded as a union of molecules retaining their identities
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| 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
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| Chemical Reaction | a process in which one or more substances are changed into others
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| 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
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| Products (in a chemical reaction) | a substance obtained from another substance through chemical change
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| 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
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| 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
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| 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
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| Metallic Compound | A metallic compound is a compound that contains one or more metal elements
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| Synthesis | Formation of a compound from simpler compounds or elements
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| Decomposition | separation into constituents by chemical reaction
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| Single Replacement | A chemical reaction in which an element replaces one element in a compound.
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| Double Replacement | a chemical reaction where two elements in different compounds trade places
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