estequiometria - inglês Flashcards
(15 cards)
What is stoichiometry?
The calculation of reactants and products in chemical reactions.
True or False: Stoichiometry is based on the conservation of mass.
True
Fill in the blank: In a balanced chemical equation, the number of _____ must be equal on both sides.
atoms
What is the mole ratio in stoichiometry?
The ratio of moles of one substance to moles of another in a balanced equation.
How do you calculate the number of moles from grams?
Divide the mass of the substance by its molar mass.
Multiple Choice: Which of the following is a step in stoichiometric calculations? A) Balancing the equation B) Measuring temperature C) Ignoring reactants
A) Balancing the equation
What is the purpose of balancing a chemical equation?
To ensure that the same number of each type of atom appears on both sides of the equation.
True or False: Stoichiometry can be used to find the limiting reactant in a reaction.
True
What is a limiting reactant?
The reactant that is completely consumed first in a chemical reaction, limiting the amount of product formed.
Fill in the blank: The _____ is the maximum amount of product that can be produced from a given amount of reactants.
theoretical yield
What is the difference between theoretical yield and actual yield?
Theoretical yield is the calculated maximum amount of product, while actual yield is the amount obtained from the experiment.
Multiple Choice: Which unit is commonly used to express the amount of substance in stoichiometry? A) Liters B) Moles C) Grams
B) Moles
What is the significance of the coefficients in a balanced chemical equation?
They represent the number of moles of each substance involved in the reaction.
True or False: Stoichiometric calculations can only be performed for reactions in aqueous solutions.
False
Fill in the blank: The _____ of a reaction is the ratio of the actual yield to the theoretical yield, expressed as a percentage.
percent yield
