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Chapter 12 Stoichiometry
Key Concepts and Vocabulary
15
Chemistry
11th Grade
05/13/2012

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Term
How is a balanced equation like a recipe?
Definition
a balanced chemical equation provides the same kind of quantitative information that a recipe does.
Term
How does a chemist use balanced chemical equation?
Definition
chemists use balanced chemical equations as a basis to calculate how much reactant is needed or product is formed in a reaction.
Term
In terms of what quantities can you interpret a balanced chemical equation?
Definition
a balanced chemical equation can be interpreted in terms of different quantities, including numbers of atoms, molecules, or moles; mass; and volume.
Term
What quantities are conserved in every chemical reaction?
Definition
mass and atoms are conserved in every chemical reaction.
Term
Stoichiometry
Definition
A subject of chemistry that focuses on the calculations of quantities in chemical reactions.
Term
How are mole ratios used in chemical calculations?
Definition
in chemical calculations, mole ratios are used to convert between moles of reactant and moles of product, between moles of reactants, or between moles of products.
Term
What is the general procedure for solving a stoichiometric problem?
Definition
in a typical stoichiometric problem, the given quantity is first converted to moles. Then the mole ratio from the balanced equation is used to calculate the number of moles of the wanted substance. Finally, the moles are converted to any other unit of measurement related to the unti mole, as the problem requires.
Term
Mole ratio
Definition
a conversion factor derived from the coeffiecients of a balanced chemical equation interpreted in terms of moles.
Term
How is the amount of product in a reaction affected by an insufficient quantity of any of the reactants?
Definition
in a chemical reaction, an insufficient quantity of any of the reactants will limit the amount of product that forms.
Term
What does the percent yield of a reaction measure?
Definition
the percent yield is a measure of the efficiency of a reaction carried out in the laboratory.
Term
Limiting reagent
Definition
the reagent that determines the amount of product that can be formed by a reaction.
Term
Excess reagent
Definition
the reactant that is not completely used up in a reaction.
Term
Theoretical yield
Definition
the maximum amount of product that could be formed from given amounts of reactants.
Term
Actual yield
Definition
the amount of product that actually forms when the reaction is carried out.
Term
Percent yield
Definition
the ratio of the actual yield to the theoretical yield expressed as a percent.
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