science cards
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each of the black spaces below before clicking
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| Chemistry | The study of the property of matter changes
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| Element | A 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 elements chemically combined in a specific ration, or proportion .
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| Mixture | Made from two or more pure substances - elements , compounds , or both.
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| Solution | 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 another substance is called a physical change .
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| Chemical Change | A change in matter that produces new substances
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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 | Combination of two or more atoms
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| Chemical Bond | Force that holds atoms together .
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| Chemical Equation | Shorter , easier way to show chemical reactions , using symbols instead of words .
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| Symbol | Most elements are represented by a one-letter or two-letter symbol
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| Chemical Formula | Shows the ratio of elements in the compound .
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| Subscript | Shows the number of atoms of an element in a molecule
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| Reactants | Materials that you have at the beginning of a chemical reaction
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| Conservation of Matter | Principle stating that matter is not created or destroyed during a chemical reaction .
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| Coefficient | Number in front of a chemical formula in the equation .
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| Synthesis | When two or more substances combine to make a more complex substance .
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| Decomposition | Breaks down compounds into smaller products
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| Replacement Reaction | Reaction in which one element replaces another in a compound or in which two elements in different compounds trade places .
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| Exothermic Reaction | 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 | Minimum amount of energy that has to be added to start a reaction .
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| Concentration | Amount of one material in a given volume of another material .
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| Catalyst | Material that increases the rate of a reaction by lowering the activation energy .
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| Enzymes | Provide a surface on which reactions take place
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| Inhibitor | Material used to decrease the rate of a reaction .
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| Combustion | Rapid reaction between oxygen and a substance called a fuel
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| Fuel | Material that releases energy when it burns
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