10/15 Misses

Question 1

standard entropy (3)

Answer 1

(1) the absolute entropy of a substance at a pressure of one atmosphere (2) and a standard temperature typically 25 degrees Celsius; (3) measured in joules per Kelvin

Question 2

standard molar entropy (3)

Answer 2

(1) aka standard entropy per mol (2) units are J / (K mol) (3) tables of these are given as S naught values in textbook appendixes

Question 3

standard state (3)

Answer 3

(1) this refers to solids and liquids being pure and under a pressure of one atmosphere (2) of a gas, to have a pressure of one atmosphere (3) of a solution, to have a concentration of one molar

Question 4

coulomb (3)

Answer 4

(1) a unit of electric charge (2) abbreviated C (3) one mol of electrons contains 96,485 of these

Question 5

electrodes for electrolysis (3)

Answer 5

(1) as with galvanic cells, (2) the anode is where oxidation occurs, and (3) the cathode is where reduction occurs

Question 6

specific heat capacity (3)

Answer 6

(1) denoted C sub s (2) sometimes “specific heat” for short (3) it is the heat capacity of one gram of a substance

Question 7

caveat to delta H sub reaction by standard enthalpies of formation equation (3)

Answer 7

(1) if you’re trying to find the standard enthalpy of formation per mole of a given product (2) the coefficient in front of the given product will always be nothing assumed one (3) and therefore the coefficient for the other reacting species might end up being fractional

Question 8

bond enthalpy (1-3)

Answer 8

(1) aka BDE (bond dissociation energy) or bond strength (2) this is the enthalpy change associated with the breaking of a bond in one mole of a gaseous substance (3) such as, to turn diatomic molecules into single atoms

Question 9

bond enthalpy (4-5)

Answer 9

(4) this value is always positive because enthalpy is positive when bonds are broken (5) this value is higher for double bonds than for single bonds