Unit 7 Flashcards
What is theoretical yield?
The maximum amount of product that can be produced from a given amount of reactant; the calculated value
What is percent yield?
The ratio of the actual yield to the theoretical yield, multiplied by 100
In stoichiometry problems, if you want your answer in moles, you do not need step ____
Three
What is electrolysis?
The decomposition of a substance by an electric current
What is combustion?
Type of reaction where a substance (usually a hydrocarbon compound) combines with oxygen, releasing a large amount of energy in the form of light & heat
What is a coefficient?
Number in front of a substance in a balanced equation that tells how many are in the reaction
In stoichiometry problems you always need step ___
Two
What is excess reagent?
The reagent that is not completely used up in a chem. rxn.
What is decomposition?
Type of reaction where a single compound (reactant) undergoes a reaction that produces 2 or more simpler substances (products)
AB—> A + B
AB is a cmpd.
A&B can be elements or cmpds.
In stoichiometry problems, if you start with moles you do not need step ___
One
When do decomposition reactions take place?
When energy is added, sometimes in the form of heat or electricity
What is a chemical reaction?
The process by which one or more substances are changed into one or more different substances
What is step #1 of a stoichiometry problem?
Converting the given quantity to moles
What is double replacement?
Type of reaction where the ions of 2 compounds (reactants) exchange places in aqueous solution to from 2 new compounds (products)
AB + CD —> AD + CB
All are cmpds.
What is activity series?
A list of elements organized according to the ease with which the elements undergo certain chemical reactions
What is actual yield?
The measured amount of product obtained from a chemical reaction
What is precipitate?
A solid that is produced as a result of a chemical reaction in a solution; it is insoluble & separates from the solution