exam Flashcards
(52 cards)
what is the layout of a combination reaction?
A + B —> AB
two or more combine to form one product
what is the layout of a decomposition reaction?
AB —> A + B
one reactant breaks apart to form two or more products
usually heat reactions!!
what does a combustion reaction always have?
C, H, and O
what is formula weight?
sum of the atomic weights for the atoms in the chemical formula.
ex. H2SO4 :
2(1.0amu) + 32.1amu + 4(16.0amu)
H S O
equation for percent comp?
% element = ((# of atoms)(atomic weight)) / FW of substance
what is avogadro’s number?
6.02x10^23
what are the steps for finding the empirical formula?
- convert mass to grams
- convert grams to moles
- divide each element by the smallest number of moles
what are the steps for finding the molecular formula?
- find empirical formula
- use formula :whole # = formula weight / empirical formula weight
- multiply whole number to empirical formula
what is the name of CLO-
hypochlorite
what is the name of CLO2-
chlorite
what is the name of CLO3-
chlorate
what is the name of CLO4-
perchlorate
what is the theoretical yield?
yield calculated. maximum amount of product made
what is percent yield?
% yield = (actual yield / theoretical yield) x100
what is percent yield?
% yield = (actual yield / theoretical yield) x100
what is the equation for molarity?
M = moles of solute / volume of solution in L
how do you convert mL to L
L = mL / 1000
what is the dilution equation?
(c1)(v1) = (c2)(v2)
what is oxidation?
loss of electrons
what is reduction?
gain of electrons
what is the oxidation number of an atom in its elemental form?
0
ex. Na (s)
what is the oxidation number for a monatomic ion?
the same as its charge.
ex. H = +1
the sum of the oxidation numbers in a neutral compound is…
0
ex. H2O
the sum of the oxidation numbers in a polyatomic ion is…
the same as its charge.
ex. Cr2O7^-2
