Stoichiometry Flashcards
when a substance undergoes a ____, it maintains its chemical composition
physical change
when a substance undergoes a ___, its atoms rearrange to form different substances and a chemical reaction occurs
chemical change
- a chemical reaction forms new products
- Ex: combustion, rotting, rusting, digestion
chemical change
- matter changes form but not chemical identity
- melting, shredding, boiling, chopping
physical change
states that there is no detachable change in mass during the course of any chemical reaction
law of conservation of mass
since atoms are not created or destroyed in a chemical reaction, chemical equations must be ___
balanced
is one in which a substance burns in oxygen, releasing heat and exhibiting a flame
combustion reaction
when a ___ a substance containing only and H, or a compound containing only C, H, and O undergoes complete combustion, it reacts without O2(g) and produces CO2(g) and H2O(l)
hydrocarbon
- a unit of measurement developed for counting molecules & atoms is the mole
mole
one more of particles contains the same number of particles as there are carbon atoms is exactly
12 g of C^12
the number of particles in one mole is
6.022x10^23 = Avogadro’s number
the reactant that is completely consumed
limiting reactant
the reactant that is not used up
excess reactant
is the amount of product obtained from lab data
actual yield
is the amount of product obtained from stoichiometry
theoretical yield
