UNIT 6 - Vocabulary QUIZ

What is the definition of a "mole" in chemistry?

• The mass of one molecule of a substance

• The quantity of particles (atoms, molecules, etc.) in 12 grams of carbon-12

• The atomic mass of an element in grams

• A unit to measure the volume of a substance

Avogadro's number is equal to:

What does "molar mass" refer to?

• The number of moles in a compound

• The mass of a given amount of molecules

• The mass of one mole of a substance

• The formula mass of a compound

A "conversion factor" is:

• A ratio used to express the relationship between two different units

• The mass of one mole of a substance

• A measurement used to convert grams to atoms

• The number of molecules in one mole of a substance

What is the "formula mass" of a compound?

• The total weight of a single molecule

• The sum of the atomic masses of all atoms in a molecule or formula unit

• The molar mass divided by the number of atoms in a molecule

• The ratio of atoms in a given compound

"Percent composition" refers to:

• The percent of a compound's mass that comes from a specific element

• The percent yield of a chemical reaction

• The ratio of moles in a compound

• The percentage of elements in an atom

What does "stoichiometry" study?

• The energy changes during a reaction

• The relationship between the amounts of reactants and products in a chemical reaction

• The behavior of gases in reactions

• The properties of elements in the periodic table

A "mole ratio" is:

• The ratio of moles of products to reactants in a balanced equation

• The ratio of mass to volume in a reaction

• The number of moles of a substance divided by the number of atoms

• The ratio of grams of one substance to another

The "limiting reactant" is:

• The reactant that is present in excess and doesn't get used up

• The reactant that is completely consumed in a reaction

• The substance that determines the amount of product produced

• The chemical that is produced in the largest amount

An "excess reactant" is:

• A reactant that is completely consumed in a reaction

• A substance that prevents a reaction from going to completion

• A reactant that remains after the reaction is complete

• The substance that determines the rate of the reaction