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Chapter 3 Vocabulary
Stoichiometry: Calculations with Chemical Formulas and Equations
19
Chemistry
12th Grade
03/03/2011

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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
Avagadro's Number
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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