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Chapter 6
Key Terms and Concepts
27
Chemistry
Undergraduate 1
03/11/2012

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Term
activation energy
Definition
The energy needed to break the bonds of reacting molecules
Term
actual yield
Definition
The actual amount of product produced by a a reaction
Term
Avogadro's number
Definition
The number of items in a mole; equal to 6.02 x 1023
Term
balanced equation
Definition
The final form of a chemical equation that shows the same number of atoms of each element in the reactants and products
Term
chemical equation
Definition
A shorthand way to represent a chemical reaction using chemical formulas to indicate the reactants and products and coefficients to show reacting ratios
Term
chemical reaction
Definition
The process by which a chemical change takes place
Term
coefficients
Definition
Whole numbers 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
Term
combination reaction
Definition
A reaction in which reactants combine to form a single product
Term
decomposition reaction
Definition
A reaction in which a single reactant splits into two or more simpler substances
Term
double replacement reaction
Definition
A reaction in which parts of two different reactants exchange places
Term
endothermic reaction
Definition
A reaction in which the energy of the products is greater than that of the reactants
Term
excess reactant
Definition
The reactant that remains when the limiting reactant is used up in a reaction
Term
exothermic reaction
Definition
A reaction in which the energy of the reactants is greater than that of the products
Term
formula unit
Definition
The group of ions represented by the formula of an ionic compound
Term
heat of reaction
Definition
The heat (symbol ΔH) absorbed or released when a reaction takes place at constant pressure
Term
limiting reactant
Definition
The reactant used up during a chemical reaction; it limits the amount of product that can form
Term
molar mass
Definition
The mass in grams of 1 mole of an element equal numerically to its atomic mass. The molar mass of a compound is equal to the sum of the masses of the elements in the formula
Term
mole
Definition
A group of atoms, molecules, or formula units that contains 6.02 x 1023 of these items
Term
mole-mole factor
Definition
A conversion factor that relates the number of moles of two compounds derived from the coefficients in an equation
Term
oxidation
Definition
The loss of electrons by a substance. Biological oxidation may involve the addition of oxygen or the loss of hydrogen
Term
oxidation-reduction reaction
Definition
A reaction in which the oxidation of one reactant is always accompanied by the reduction of another reactant
Term
percent yield
Definition
The ratio of the actual yield of a reaction to the theoretical yield possible for the reaction that is multiplied by 100%.
Term
products
Definition
The substances formed as a result of a chemical reaction
Term
reactants
Definition
The initial substances that undergo change in a chemical reaction
Term
reduction
Definition
The gain of electrons by a substance. Biological reduction may involve the loss of oxygen or the gain of hydrogen
Term
single replacement reaction
Definition
A reaction in which an element replaces a different element in a compound
Term
theoretical yield
Definition
The maximum amount of product that a reaction can produce from a given amount of reactant
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