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Chapter 5, CHEM 105
Intructor: Angela McGuirk, MMCC
23
Chemistry
Undergraduate 1
01/10/2011

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Term
Activation energy
Definition
The energy needed upon collision to break apart the bonds of the reacting molecules
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
Catalyst
Definition
A substance that increases the rate of reaction by lowering the activation energy
Term
Chemical change
Definition
The formation of a new substance with a different composition and different properties than the initial substance
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 that requires heat; the energy of the products is higher than the energy of the reactants
Term
Exothermic reaction
Definition
A reaction that releases heat; the energy of the products is lower than the energy of the reactants
Term
Formula units
Definition
The group of ions represented by the formula of an ionic compound
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 multiplied by their subscripts 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
Term
Oxidation-reduction reaction
Definition
A reaction in which the oxidation of one reactant is always accompanied by the reduction of another reactant
Term
Physical change
Definition
A change in which the physical appearance of a substance changes but the chemical composition stays the same
Term
Products
Definition
The substance formed as a result of a chemical reaction
Term
Reactants
Definition
The initial substances that undergo change in a chemical reaction
Term
Single replacement reaction
Definition
A reaction in which an element replaces a different element in a compound
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