Science Definitions
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| Element | Substance that cannot be broken down into any other substances by chemical or physical means.
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| Compound | A substance made of two or more element chemically combined in a specific ratio, or proportion.
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| Mixture | Is made up of two or more pure substances-elements, compounds, or both- that are in the same place but not combined as a new material.
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| Solution | A well-mixed mixture.
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| Physical Change | A change that alters the form or appearance of a material but does not make the material into material into another substance.
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| Chemical Change | A change in matter that produces new substances. Example: substances --> made + steps.
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| Precipitate | A solid that forms from solution during a chemical reaction.
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| Atom | The smallest particle of an element/
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| Molecule | The combination of two or more atoms.
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| Chemical Bond | The force that holds atoms together.
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| Chemical Equation | A shorter, easier way to show chemical reactions, using symbols instead of words.
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| Symbol | Most elements are represented by a one word letter or two letter symbol.
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| Chemical Formula | A compound is represented by a "word" called a chemical reactions, using symbols instead of words.
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| Subscript | Shows the number of atoms of an element in a molecule.
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| Reactants | The materials you have at the beginning of a chemical reaction
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| Products | When the reaction is complete, you have different materials, called the products of the reaction.
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| Coefficient | A number in front of a chemical formula in the equation.
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| Synthesis | When two or more substances (elements or compounds) combine to make a more complex substance.
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| Decomposition | Reaction breaks down compounds into simpler products.
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| Replacement Reaction | A reaction in which one element replaces another in a compound or in which two elements in different compounds in trade places.
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| Exothermic Reaction | A reaction that releases energy in the form of heat.
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| Endothermic Reaction | A reaction that absorbs energy.
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| Activation Energy | The minimum amount of energy that has to be added to start a reaction.
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| Concentration | The amount of one material in a given volume of another material.
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| Catalyst | A material that increases the rate of a reaction by lowering the activation energy.
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| Enzymes | Provides a surface on which reactions takes place.
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| Combustion | A rapid reaction between oxygen and a substance called a fuel.
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| Fuel | A material that releases energy when it burns.
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