Chem Chapter 8

Created by

Emma

Cards (20)

Stoichiometry
The study of mass relationships of elements in compounds and among reactants and products.
Balanced Chemical Equation
Allows determination of mole ratio and represents the number of moles for each reactant and product.
Mole Ratio
The ratio of moles of wanted substance to moles of given substance in a balanced chemical equation.
Coefficients
Represent the number of moles of each substance in a balanced chemical equation.
Limiting Reactant
The reactant that controls the amount of product obtained in a chemical reaction.
Percent Yield Formula
Actual yield divided by theoretical yield, multiplied by 100.
Actual Yield
The measured amount of product obtained in a chemical reaction.
Theoretical Yield
The maximum amount of product that can be made according to mass to mass stoichiometry.
Exothermic Reaction
Releases heat, resulting in products having less energy than the reactants and a negative ΔH.
Endothermic Reaction
Absorbs heat, resulting in products having more energy than the reactants and a positive ΔH.
Mole to Mole Conversion
Given moles multiply by mole ratio.
Mole to Mass Conversion
Given moles multiply by mole ratio, then multiply by molar mass of the wanted substance.
Mass to Mole Conversion
Given grams divided by molar mass of given, then multiply by mole ratio
Mass to Mass Conversion
Given grams divided by molar mass of given, then multiply by mole ratio, then multiply by molar mass of the wanted substance.
Mole Ratio 
Each type of stoichiometry problem requires you to use this.
Stops 
When the limiting reactant is completely used up in a reaction, this happens to the reaction.
Less Than 
In most reactions the amount obtained, actual yield, is usually ___ than the theoretical yield.
Efficiency
If a chemist is interested in this, they calculate percent yield.
How is heat involved when going from a solid to liquid to gas?
endothermic
How is heat involved when going from a gas to liquid to solid?
exothermic