AP Chemistry Flashcards: Stoichiometry
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 10 cards to help you master important concepts.
What fundamental principle allows for the calculation of product and reactant amounts in a chemical reaction?
The conservation of atoms in chemical processes makes it possible to calculate product amounts from reactant amounts, or reactant amounts from product amounts.
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What fundamental principle allows for the calculation of product and reactant amounts in a chemical reaction?
The conservation of atoms in chemical processes makes it possible to calculate product amounts from reactant amounts, or reactant amounts from product amounts.
How can stoichiometry be combined with the ideal gas law?
Stoichiometric calculations can be combined with the ideal gas law to quantitatively study reactions involving gaseous reactants or products by relating moles to pressure, volume, and temperature.
To perform a stoichiometric calculation for a reaction involving a solution, what two key pieces of information are often combined?
Stoichiometric calculations for solutions often combine mole ratios from the balanced equation with molarity calculations (moles/liter).
What do the coefficients in a balanced chemical equation represent?
Coefficients in a balanced chemical equation show the proportionality of amounts, in moles, of the different substances involved in the reaction.
Stoichiometric Calculations
These are calculations based on the mole ratios from a balanced chemical equation that are used to determine the amounts of reactants or products in a reaction.
What is the quantitative basis for all stoichiometric calculations?
The coefficients in balanced chemical equations, which represent the proportionality of amounts in moles, serve as the quantitative basis for all stoichiometric calculations.
How does a balanced reaction equation explain the relationship between reactants and products?
A balanced equation explains the changes in the amounts of reactants and products by showing the precise mole ratios in which they are consumed and formed.
Why is it possible to calculate the amount of reactants needed based on a desired amount of product?
Because atoms are conserved, the balanced equation provides a fixed ratio of moles, allowing one to work backward from the amount of product to find the required amount of reactants.
How are the coefficients from a balanced equation used in stoichiometric calculations?
The coefficients are used to create mole ratios, which serve as conversion factors to calculate the amount of one substance from the known amount of another.
In what way are stoichiometry and molarity calculations used together?
These calculations are combined to quantitatively study reactions in solutions, allowing for the conversion between the volume of a solution and the moles of a substance.