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Chemistry terms

Chapter 1

Chemistry is the study of the properties of the matter and how changes
Element is a substance that cannot be broken down into any other substances by chemical or physical means
Compound is a substance made of two or more elements chemically combined in a specific ratio, 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.
Physical Change A change that alters the form or appearance of a material but does not make the material into another substance
Chemical Change A change in matter that produces new substances
Precitate A solid that forms from solution during a chemical reaction
Atom The smallest particle of an element
Molecule is the combination of 2 or more atoms
Chemical bond The force that holds atoms together
Chemical equation is a shorter, easier way to show chemical reactions, using symbols instead of words.
Symbol most elements are represented by a one-letter or 2 letter
Chemical formula shows the ratio of elements in the compound
Subscript shows the number of atoms of an element in a molecule
Reactants The materials you have at the beginning of a chemical reaction
Products when the reactant is complete
Conversation of matter the principle stating that matter is not created or destroyed during a chemical reaction
Coefficient is a number in front of a chemical formula in the equation
Synthesis When two or more substances combine to make a more complex substance
Decomposition A reaction that 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
Exothermic Reaction A reaction that releases energy in the form of heat
Endothermic reaction A reaction that absorbs energy
Activation Energy is the minimum amount of energy that has to be added tp start a reaction
Consecration is the amount of one material in a given volume of another material
Catalyst is a material that increases the rate of a reaction by lowering the activation energy
Enzymes Provide a surface on which reactions take place
Inhibitor A material used to decrease the rate of a reaction
Combustion Is a rapid reaction between oxygen and a substance called a fuel
Fuel Is a material that releases energy when it burns
Created by: kaylee2279