Chapter 3 Stoichiometry: Calculation With Chemical Formulas And Equation Flashcards
What is law of Conservation of Mass?
The law of conservation of mass states that mass within a closed system remains the same over time.
What is Chemical Equation?
Concise representations of chemical reactions
What is reactant?
a substance that takes part in and undergoes change during a reaction.
What is products?
a substance that is present at the end of a chemical reaction.
What is a coefficient?
Are inserted to balance the equation
What are subscripts?
Tell the number of atoms of each element in a molecule
What is combination Reaction?
is a reaction in which two reactants combine to form one product.
What is decomposition reaction?
One substance breaks down into two or more substances.
What is combustion Reaction
is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat.
What formula Weight?
the sum of the atomic weights of all atoms appearing in a given chemical formula.
What is molecular Weight (MW)
mass of a molecule of a substance, based on 12 as the atomic weight of carbon-12
What is percent composition?
tells you by mass what percent of each element is present in a compound.
What is avogadro number used for?
It permits one to compare the different atoms or molecules of given substances where the same number of atoms or molecules are being compared.
What is molar mass
is defined as the mass of a sample of that compound divided by the amount of substance which is the number of moles in that sample, measured in moles.
What is empirical Formula
a formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.
