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science cards

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