Elements, Molecules and Chemical Equations
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| Law of Conservation of Mass | the principle that matter cannot be created or destroyed.
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| Physical Change | a usually reversible change in the physical properties of a substance, as size or shape
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| Chemical Change | a usually irreversible chemical reaction involving 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
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| Element | one of a class of substances that cannot be separated into simpler substances by chemical means
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| Chemical Formula | a representation of a substance using symbols for its constituent elements
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| Element (Diatomic) Molecule | having two of the same atoms in the molecule
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| Compound Molecule | a pure substance composed of two or more elements whose composition is constant
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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 rearrangement of the atoms or molecules of two or more substances that come into contact with each other, resulting in the formation of one or more new substances.
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| Reactants | any substance that undergoes a chemical change in a given reaction
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| Products | a substance obtained from another substance through chemical change
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| Coefficient | States the number of molecules of the certain molecule it is in front of
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| Subscript | Number written under the certain atom, states the number of atoms of the element it is underneath
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| Ionic Compound | a chemical compound of cations and anions which are held together by ionic bonds in a lattice structure
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| Covalent Compound | A compound made of molecules- not ions. The atoms in the compound are bound together by shared electrons. Also called a molecular compound.
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| Metallic Compound | Compounds that contain at least one metallic element.
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| Synthesis | the forming or building of a more complex substance or compound from elements or simpler compounds.
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| Decomposition | A reaction in which a compound is broken down into simpler compounds or elements. Compounds sometimes decompose if heated strongly or if subjected to a strong electric current
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| Single Replacement | A reaction of the form A + BC = B + AC. For example, zinc displaces hydrogen from hydrochloric acid in the following reaction: Zn(s) + 2 HCl(aq) = ZnCl2(aq) + H2(g).
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| Double Replacement | A double displacement or metathesis is a reaction in which two reactants trade fragments:
AB + CD = AC + BD
Most commonly, the fragments are ions, e. g.
AgNO3(aq) + NaCl(aq) = AgCl(s) + NaNO3(aq)
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