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Science Flashcards


Chemistry is the study of the properties of matter how matter changes.
Element Is a substance that cannot be broken into any other substances b chemical or physical means.
Compound Is a substance made of two or more elements chemically combined in a specific ration, or proportion.
Mixture Is made from two or more pure substances-elements, compounds, or both- that are in the same place but not combined as a new material.
Solution is a well-mixed mixture.
Precipitate A solid that forms from solution during a chemical reaction is called a
atom The smallest particle of an element is an
Molecule the combination of two or more atoms.
Chemical bonds The force that holds atoms together is called
Chemical equation is a shorter, easier way to show that chemical reactions, using symbols instead of words.
Symbol Most elements are represented by a one-letter or two-letter
Chemical formula A compound is represented by a "word", which shows the ratio of elements in the compound is called
subscript shows the number of atoms of an element in a molecule.
reactants The materials you have at the beginning of a chemical reaction are
products When the reaction is complete, you have different materials, called the ____ of the reaction.
Conservation of matter The principle stating that matter is not created or destroyed during a chemical reaction is
Coefficient is a number in front of a chemical formula in the equation.
Synthesis When two or more substances (elements or compounds) combine to make a more complex substance, the process is called
Decomposition reaction breaks down compounds into simpler products.
replacement reaction a reaction in which one element replaces another in a compound or in which two elements in different compounds trade places, is called a
Exothermic reaction A reaction that releases energy in the form of heat is called
endothermic reaction A reaction that absorbs energy is called an
Activation Energy is the minimum amount of energy that has to be added to start a reaction.
Concentration is the amount of one material in a given volume of another material.
catalyst A material that increases the rate of a reaction by lowering the activation energy.
Enzymes provide a surface on which reactions take places.
inhibitor A material used to decrease the rate of a reaction is called an
Combustion a Rapid reaction between oxygen and a substance called a fuel
Fuel is a material that releases energy when it burns
Created by: teehee44