Chapter 11 Test Flashcards
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(T or F) Balanced equations are required in order to perform stoichiometry calculations correctly.
True
(T or F) Empirical formulas can be used to properly describe the composition of ionic compounds.
True
(T or F) The number of helium atoms in a mole of helium is equal to the number of lead atoms in a mole of lead.
True
(T or F) A compound may have identical empirical and molecular formulas.
True
(T or F) The number of particles of a pure substance can be converted directly to grams of that same substance.
False
(T or F) The coefficients of a balanced equation give mole ratios rather than mass ratios.
True
(T or F) The mass of a substance may be converted to moles by using the molar mass of that substance.
True
(T or F) A molecular compound may have identical empirical and molecular formulas.
True
(T or F) Balanced equations are not always required to perform stoichiometric calculations correctly.
False
(T or F) An actual yield divided by a percent yield and multiplied by 100% gives a theoretical yield.
False
To convert from moles of one substance to moles of another substance, a(n) ___________ is used.
Mole Ratio
The maximum amount of product that could be created from a given amount of reactant is its ______________.
Theoretical Yields
What is the molar mass of Mg(NO₂)₂?
116.315 Mg(No₂)₂ Molar Mass
The term determined as the amount of substance that contains exactly 6.022 x 10²³ particles is __________________.
Avogadro’s Number
In most chemical reactions, the reactions stops when the _________________ is used up before the other reactants
Limiting Reactant
What type of formula best represents the arrangement of bonds in a molecule?
Structural Formula
What term best describes the mathematical relationships between the amounts of reactants and products in a chemical reaction?
Stoichiometry
We can calculate the percent composition of a compound directly from its formula if we know ________________________________________________.
The molar mass of each element in the compound.
The term used to describe the mass composition of a compound by showing what percentage of its total mass comes from each element is _____________________________.
Percent Composition
Why must stoichiometric conversions between substances in a reaction be performed in moles?
The balanced equation is based on ratios of moles, not masses.
We can calculate the percent composition of a compound directly from its formula if we know _____________________________________________________.
The molar mass of each element in the compound.
Which type of formula best represents the arrangement of bonds in a molecule?
Structural Formula
The most important indicator of efficiency for a chemical manufacturing company is ________ yield
Percent
