5: pre/post questions
How many moles of water are in the compound copper sulfate pentahydrate? 3 5 6 7
5
A reaction is performed in a lab whereby two solutions are mixed together. The products are a liquid and a solid precipitate. What procedures would facilitate measurement of actual yield of the solid? -Calculate the maximum potential yield, and apply the final value in the appropriate equation. -Use filter paper to isolate and dry the precipitate, and then determining mass of the solid. -Find the cumulative mass of the precipitate and solid, and extrapolate the molecular mass. -All of the above
Use filter paper to isolate and dry the precipitate, and then determining mass of the solid.
In order to calculate the theoretical maximum amount of product produced in a precipitation reaction, you must _____. -convert grams of reactants to moles -determine how many moles of reactants are necessary to reach stoichiometric quantities -determine moles of product from the reaction -convert moles of product to grams -All of the above
all of the above
Why might the actual yield of a precipitation reaction not equal the theoretical yield? -Environmental conditions may cause variations in the water content of the hydrate. -The reaction did not go to completion. -The precipitate was not properly isolated. -All of the above
all of the above
An illustration of the reaction that occurs between two or more chemical compounds
chemical equation
A mole is a unit of measure, describing the amount of a chemical substance that contains as many atoms, ions, or molecules as there are in exactly 12 grams of pure Nickel. true or false
false; carbon
A _____ is a solid compound that contains _____ molecules. hydrate; water water molecule; hydrated hydrate; solid hydrate; hydrated
hydrate; water
A solid compound that contains water molecules
hydrates
Unit of measure, containing Avogadro's number
mole
The term for a reaction where two solutions are mixed and an insoluble substance forms is called a _____ reaction. chemical soluble precipitation stoichiometry balanced
precipitation
Two solutions are mixed and an insoluble substance forms
precipitation reaction
The compounds produced from the reaction
products
The chemical compounds that are present before a reaction occurs
reactants
The chemicals that are present before a reaction occurs are called _____, and the chemicals produced from the reaction are called _____. products; reactants reactants; products
reactants; products
The quantitative proportion of reactants to products
stochiometry
The quantitative proportion of reactants to products in a chemical reaction is known as _____. the Law of Conservation of Mass stoichiometry the precipitation coefficient
stoichiometry
A chemical equation is a written representation of the process that occurs in a chemical reaction. true or false
true
A precipitation reaction produces insoluble substances that can be removed from the solution. true or false
true
Stoichiometric quantities can be used to maximize the amount of product produced from a chemical reaction. true or false
true
The molar mass of H2O is approximately 18 grams; thus, one mole of H2O weighs approximately 18 grams. true or false
true
