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Chemistry III
Final Exam
69
Chemistry
Undergraduate 1
09/28/2011

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Term
Dynamic equilibrium
Definition
rates of
the forward and reverse reaction rates are equal
Term
larger the k value the ________ product at equilibrium
Definition
more product
Term
concentration of reactions at equilibrium
Definition
not equal
Term
Keq >> 1
Definition
equilibrium favors products
Term
Keq << 1
Definition
equilibrium favors reactants
Term
K backward =
Definition
1/ K forward
Term
Q > K
Definition
fastest in the reverse direction,the [products] will decrease and [reactants] will increase
Term
Q < K
Definition
fastest in forward direction, the [products] will increase and [reactants] will decrease
Term
Q = K
Definition
reaction is at equilibrium
Term
Properties of acids
Definition
sour
reacts with active metals
corrosive
litmus blue turns to red
reacts with carbonates
Term
Binary acids
Definition
acid hydrogens attached
to a nonmetal atom
Term
Oxy acids
Definition
acid hydrogens attached to
an oxygen atom
Term
Carboxylic acids
Definition
have COOH group
Term
Properties of Bases
Definition
bitter
red litmus turns blue
known as alkalis
Solutions feel slippery
Term
Indicators
Definition
change color depending on acidity or basicity,litmus, Phenolphthalein
Term
Arrhenius Base
Definition
dissociate in water to produce OH− ions
and cations
Term
Arrhenius Acid
Definition
ionize in water to produce H+ ions and
anions
Term
Arrhenius Acid–Base Reactions
Definition
acid + base → salt + water
Term
Brønsted-Lowry Acid
Definition
acid is an H donor
Term
Brønsted-Lowry Base
Definition
base is an H acceptor
Term
Amphoteric
Definition
can act as an acid or a base (water)
Term
Conjugate acid has one ________ proton
Definition
has one more proton (hydrogen)
Term
strong acid or base is a ________ electrolyte
Definition
strong, and vise versa
Term
larger Ka = ________ acid
Definition
stronger
Term
pH formula
Definition
pH = -log[H3O+], to get [H3O+] 10^-(pH)
Term
autoionization
Definition
atoms and molecules spontaneously emit a valence electrons
Term
Dissociation Constant of Water
Definition
Ion Product of Water: [H3O+] x [OH–] = Kw = 1.00 x 10^−14 @ 25 °C
Term
pOH formula
Definition
pOH = −log[OH−], [OH−] = 10^−pOH
Term
pH+ pOH =
Definition
14.00
Term
strength of an acid or
base formula
Definition
pKa = -log(Ka), Ka = 10^-pKa
pKb = -log(Kb), Kb = 10^-pKb
Term
stronger the acid the _________ pKa
Definition
smaller
Term
larger Ka = ________ pKa
Definition
smaller
Term
polyprotic acids
Definition
more than one ionizable H-, stronger than monoprotic acids
Term
Percent Ionization =
Definition
(molarity of ionized acid / initial molarity) * 100
Term
Salts
Definition
water-soluble
can be acidic or basic
Term
anion
Definition
conjugate
base of an acid
Term
stronger the acid, the _________ the conjugate base
Definition
weaker the
conjugate base
Term
higher electronegativity = _________ acidity
Definition
higher acidity, increases right and down periodic table
Term
Lewis Acid Base theory
Definition
focuses on transferring
an electron pair
Term
Lewis Base
Definition
electron donor
electron rich, therefore nucleophile
Term
Lewis Acid
Definition
electron acceptor
electron deficient, therefore electrophile
Term
acid rain
Definition
pH less than 5.6, corrodes carbonate (bridges, cement, marble, limestone)
Term
danger of antifreeze
Definition
contains ethylene glycol which is turned into glycolic acid by liver, lowers blood pH causes acidosis
Term
buffers
Definition
resist changes in pH when an acid or base is added
Term
Making an Acid Buffer
Definition
weak acid mixed with solution of soluble salt containing conjugate base anion
Term
common ion
Definition
conjugate base of the acid
Term
Relationship between pKa and pKb
Definition
−log(Ka) + −log(Kb) = 14
pKa + pKb = 14
Term
Henderson-Hasselbalch Equation
Definition
pH=pKa+log(A-/HA)
Term
buffering capacity
Definition
amount of acid or
base a buffer can neutralize
Term
buffering range
Definition
pH range the buffer can
be effective
Term
effectiveness of a buffer depends on
Definition
1. relative amounts of acid and base
2. absolute concentrations of acid and base
Term
buffers will work when
Definition
0.1 < [base]:[acid] < 10
Term
buffers most effective when there are
Definition
equal concentrations of acid and base
Term
titration
Definition
a solution of unknown concentration
(titrant) is slowly added to a solution of known concentration
Term
the equivalence point
Definition
inflection point of the curve
Term
solubility product, Ksp
Definition
constant of dissociation of a
solid salt into its aqueous ions
Term
molar solubility
Definition
number of moles of
solute that will dissolve in a liter of solution
Term
complex ions
Definition
Ions that form by combining a cation with several anions or neutral molecules
Term
ligands: the (H2O) in Ag(H2O)2
Definition
attached ions or molecules of complex ions
Term
conjugate base has one _______ hydrogen
Definition
has one less proton (hydrogen)
Term
Ka x Kb =
Definition
kw = 1*10^-14
Term
What is the difference between a strong and weak acid
Definition
strong acid completely ionizes where a weak one partially ionizes
Term
what is the autoionization of water?
Definition
water acts as an acid and a base with itself
Term
Do both protons ionize instantaneously from a diprotic acid such as H2CO3
Definition
No polyprotic acids ionize in successive steps, the lst proton easily separates from the nuetral atom while the next protons have difficulty in separating from the anions
Term
Describe the relationship between molecular structure and acid strength
Definition
The stronger the bonds the weaker the acid, the greater the electronegativity & polarity the stronger the acid
Term
compound that is in antifreeze and is toxic to pets
Definition
ethylene glycol
Term
Sketch the titration curve for a strong acid titrated with a strong bas
Definition
[image]
Term
Identify the compound that is in stalactites and stalagmites
Definition
Calcium carbonate
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