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Chapter 5 Vocab

Chemistry: An Introduction (Timberlake) Chapter 5 Vocabulary Words

Activation Energy The energy needed upon collision to break apart the bonds of the reacting molecules
Avagadro's Number The number of items in a mole equal to 6.02 x 10^23
Balanced equation Final form of a chemical equation that shows the same number of atoms of each element in the reactants and products
Catalyst A substance that increases the rate of reaction by lowering the activation energy
Chemical Change The formation of a new substance with a different composition and different properties than the initial change
Chemical Equation A shorthand way to represent a chemical reaction using chemical formulas to indicate the reactants, products and coefficient to show reacting ratios
Chemical Reaction The process by which a chemical change takes place
Coefficients Whole number placed in front of the formulas to balance the number of atoms or moles of atoms of each element on both sides of an equation
Combination Reaction A reaction in which reactants combine to form a single product
Decomposition Reaction A reaction in which a single reactant splits into two or more simpler substances
Double Replacement Reaction A reaction in which parts of two different reactants exchange place
Endothermic Reaction A reaction that requires heat; the energy of the product is higher than the energy of the reactants
Exothermic Reaction A reaction that releases heat; the energy of the products is lower than the energy of the reactants
Formula Unit The group of ions represented by the formula of an ionic compound
Molar Mass The mass, in grams, of 1 mole of an element equal numerically to the atomic mass. The molar mass of a compound is equal to the sum of the masses of the elements multiplied by their subscripts of the formula
Mole A group of atoms, molecules, or formula units that contain 6.02 x 10^23 of these items
Mole-Mole Factor A conversion factor that relates the number of moles of two compounds derived from the coefficients in an equation
Oxidation The loss of electrons of a substance. Biological oxidation may involve the addition of oxygen or the loss of hydrogen
Oxidation-Reduction Reaction A reaction in which the oxidation of one reactant is always accompanied by the reduction of another reactant
Physical Change A change in which the physical appearance of a substance changes but the chemical composition stays the same
Products The substances formed as a result of a chemical reaction
Reactants The initial substances that undergo change in a chemical reaction
Reduction The gain of electrons by a substance. Biological reduction may involve the loss of oxygen or gain of hydrogen
Single Replacement Reaction A reaction in which an element replaces a different element in a compound.
Created by: kallenpoole