Gas Laws
Volume of 1 mole of gas at STP
What is 22.4L?
How many atoms are in one mole of an element?
6.02x1023
If Ka is 4.6 x 10-4 at the half equivalence point, what is pH equal to at the half equivalence point?
3.34
If an atom has 4 electron domains (paired electrons), what is the molecular geometry?
Tetrahedral
Is a reaction thermodynamically favorable when delta G is positive or negative?
Negative
Law stating P1V1=P2V2
Boyle's Law
What is molarity?
M/L
Will a weak acid titrated with a strong base have a pH above or below 7 at the equivalence point?
Above 7
What are the three types of Vanderwall's intermolecular forces?
London-Disperson forces, Dipole-Dipole, Hydrogen bonding
If delta H is positive and delta S is negative, what temperatures will the reaction proceed at?
None
If volume is constant and temperature decreases, what happens to pressure?
Pressure will decrease
O2 + 2CO -> 2CO2
If you have 32 grams of Oxygen and excess CO, how many moles of CO2 would be produced?
2 moles of CO2
How many sig figs are in: pH of 7.46
Two sig figs
What elements can participate in hydrogen bonding?
Nitrogen, Oxygen, Fluorine
Is a reaction with a delta H of -120 endothermic or exothermic?
Exothermic
What conditions make gases behave most ideally?
High temperatures and low pressures.
What is the equation for percent yield?
Actual yield/theoretical yield x100
What does a buffer do?
It resists a change in pH.
Which has the higher lattice energy? Na2O or CsAt?
Na2O
Does increasing the delta G speed up the reaction?
According to Graham's law of effusion, would neon or argon effuse faster?
Neon
If the average atomic mass of calcium is 40.08, which isotope is more abundant: Calcium 40 or Calcium 41
Calcium 40
What makes a good buffer?
A high concentration of an acid and base with similar Ka's and Kb's.
If the molecule has a seesaw geometry, what are the bond angles?
~180, ~120, ~90
What does a catalyst do to a reaction?
It lowers the activation energy