# Shared Flashcard Set

## Details

Chapter 3 Vocabulary
Stoichiometry: Calculations with Chemical Formulas and Equations
19
Chemistry
03/03/2011

Term
 Stoichiometry
Definition
 The relationships among the quantities of reactants and products involved in chemical reactions.
Term
 Law of Conservation of Mass
Definition
 Total mass of products of chemical reaction are the same mass of reactants, so that mass remains constant during the reaction.
Term
 Chemical Equation
Definition
 A representation of a chemical reaction using the chemical formulas of the reactants and products - balanced contain numbers of atoms of each element on both side.
Term
 Reactant
Definition
 A starting substance in a chemical reaction - appears to the left of the arrow in a chemical reaction.
Term
 Product
Definition
 A substance produced in a chemical reaction - appears to the right of the arrow in a chemical reaction.
Term
 Combustion Reaction
Definition
 Chemical reaction that proceeds with evolution of heat and usually a flame - most involve a reaction with oxygen, as in burning of a match.
Term
 Combination Reaction
Definition
 Chemical reaction in which two or more substances combine to form a single product.
Term
 Decomposition Reaction
Definition
 Chemical reaction in which a single compound reacts to give two or more products.
Term
 Atomic Weight
Definition
 Average mass of atoms in an element in amu - numerically equal to mass in grams of 1 mol of the substance.
Term
 Atomic Mass Unit(amu)
Definition
 Unit based on value of exactly 12 amu for the mass of the isotope of carbon that has 6 protons and 6 neutrons in the nucleus.
Term
 Formula Weight
Definition
 Mass of a collection of atoms represented by a chemical formula. (IONIC)
Term
 Molecular Weight
Definition
 Mass of a collection of atoms represented by the chemical formula for a molecule. (COVALENT)
Term
 Mass Spectrometer
Definition
 An instrument used to measure the precise masses and relative amounts of atomic and molecular ions.
Term
 Mole
Definition
 A collection of Avagadro's Number of objects.
Term
Definition
 The number of Carbon atoms in exactly 12g of Carbon 12. Equals 6.022 x 1023.
Term
 Molar Mass
Definition
 The mass of 1 mol of a substance in grams - numerically equal to the formula weight in amu.
Term
 Limiting Reactant
Definition
 Reactant present in the smallest stoichiometric quantity in a mixture of reactants - amount of product that can form is constrained by complete consumption of this reactant.
Term
 Theoretical Yield
Definition
 Quantity of a product that is calculated to form when all of the limiting reagent reacts.
Term
 Percent Yield
Definition
 The ratio of the actual (experimental) yield of a product to its theoretical (calculated) yeild, multiplied by 100.
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