Stoichiometry
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What information do chemical formulas provide us with?
Chemical formulas provide the identities of the reactants and products involved in the chemical change, allowing classification of the reaction.
What information do coefficients provide us with?
Coefficients provide the relative numbers of these chemical species, allowing a quantitative assessment of the relationships between the amounts of substances consumed and produced by the reaction.
What is a reaction’s stiochiometry?
Measure of an element used in balanced chemical equations
How are balanced chemical equations used in stoichiometry?
Balanced chemical equations are used in much the same fashion to determine the amount of one reactant required to react with a given amount of another reactant, or to yield a given amount of product, and so forth.
True or False: The coefficients in the balanced equation are used to derive stoichiometric factors that permit computation of the desired quantity.
True
What is a stoichiometric factor?
The ratio of coefficients in a balanced chemical equation, used in computations relating amounts of reactants and products
What is stoichiometry?
The relationships between the amounts of reactants and products of a chemical reaction
What can we learn from understanding the stoichiometry of a particular reaction?
We can determine how many molecules, moles, and grams will react with each other and how many molecules, moles, and grams of products will be formed
What is combustion?
A reaction in which an element or compound burns in air or oxygen
True or False: Is oxygen always one of the reactants of combustion?
True
True or False: Combustion reactions are another classification of chemical reactions
True
What does the combustion of hydrogen gas form?
Water 2H2 + O2 –> 2H2O
The combustion of compounds containing hydrogen and carbon will always produce which two products?
Water and carbon dioxide
In order to determine the masses of reactants consumed in a reaction, as well as the masses of products formed, we need to use what two important things?
Molar masses and reaction coefficients
To find the mass of one chemical from the given mass of another for a chemical reaction, we utilize what process?
Dimensional analysis
What is molar mass?
Units of g/mol gives us the ability to determine the moles of a substance from a a given mass and vice versa
What are reaction coefficients?
Units of mol/mol allows us to determine how many moles of one substance are consumed or produced relative to another
What are the steps necessary to completing a successful stoichiometry equation?
• Start with a balanced chemical equation • Determine starting point from given value and ending point from what the question is asking you to look for • Use dimensional analysis to go from necessary units of measurement