CHEMISTRY COMMUNITY

josmit_1D

ho do I start solving the following question: To prepare a dog of mass 1.5 kg for surgery, 150 mg of the anesthetic phenobarbitol is administered intravenously. The reaction in which the anesthetic is metabolized (decomposed in the body) is first order in phenobarbitol and has a half-life of 4.5 h. ...

josmit_1D

can some one explain how to approach 7E.3:The presence of a catalyst provides a reaction pathway in which the activation energy of a certain reaction is reduced from 125 kJ?mol−1 to 75 kJ?mol−1. (a) By what factor does the rate of the reaction increase at 298 K, all other factors being equal? (b) By...

josmit_1D

how do you identify an intermediate versus a catalyst?

josmit_1D

from the half life equation, how do we determine how long it takes the concentration to decrease to other levels such at 1/4 or 1/16 of its original value?

josmit_1D

why are third order reactions and higher less frequent?

josmit_1D

for a second order reaction, what equation gives a linear plot?

josmit_1D

how do you know if a reaction is steady-state or pre-equilibrium?

josmit_1D

is k' just the equilibrium constant for the reverse reaction?

josmit_1D

what is the significance of the Boltzmann distribution?

josmit_1D

would a termolecular reaction also be considered third order reaction?

josmit_1D

what does the order of the reactant tell us about the reaction mechanism?

josmit_1D

in textbook question topic 6K problem 3, why is water and hydrogen apart of the half cell equation: (S2O3)2+ 5 H2O-->2SO4+ 10H++8e-?

josmit_1D

why do we use fractions instead of whole number coefficients in the unique rate?

josmit_1D

what is the difference between a galvanic and a voltaic cell?

josmit_1D

do we need to know how to derive a integrated rate law from a differential rate law or can we simply just memorize the equation?

josmit_1D

does a porous disc/wall replace a salt bridge or does it just change the separation of the solutions?

josmit_1D

when writing a redox reaction equation, how do you know which half reaction equation to flip if not given the final redox equation?

josmit_1D

is there a maximum cell potential that can be reached?

josmit_1D

what is the difference between E and E^\bigcirc[/tex] in the Nernst equation?

josmit_1D

how do we know when we need to use an inert conductor, such as platinum?

josmit_1D

what is the importance of delta G=-RTlnk if the reaction at equilibrium does no work?

josmit_1D

in what situations would you need to use the van't hoff equation to find K?

josmit_1D

under which conditions do you use the equation: deltaG=-RTlnk?

josmit_1D

how do you calculate oxidation numbers?

josmit_1D

when there is a small ka and you disregard the subtraction of x in calculating the concentrations, how do you figure out if it is a less than 5% change?

josmit_1D

how do you know if the reaction is a spontaneous process or not?

josmit_1D

what indications if the reaction is reversible or not?

josmit_1D

how do you know when to use the equation for Cp vs. Cv when dealing with ideal gases and the change in entropy equation: delta S=nCln(T2/T1)?

josmit_1D

what does it mean when it is says delta U= q+w is an adiabatic system?

josmit_1D

in the equation deltaS= nCmln(T2/T1), what does the Cm stand for?

josmit_1D

what is the difference in equations for deltaU when there is constant pressure vs. constant volume?

josmit_1D

under what conditions does $\Delta U=\Delta H$ ?

josmit_1D

qsys+qsurr=0 in a perfect system, but is there any situation that is not perfect? if so, what would the equation be?

josmit_1D

with boltzmann equation how does S=klnW turn into S=Rln2?

josmit_1D

can someone please re-explain degeneracy and why when there are 3 atoms W=8?

josmit_1D

why must state functions be additive?

josmit_1D

what is the method to calculate the heat of reaction?

josmit_1D

what does hess's law state?

josmit_1D

what is the difference protonation and ionization?

josmit_1D

what is the difference between bond enthalpies and standard enthalpies of formation?

josmit_1D

which way will an equilibrium reaction shift if the temperature is increased during an exothermic reaction?

josmit_1D

what is the rule for temperature change if the reaction is endothermic in relation to equilibrium?

josmit_1D

how do you find the percent protonization/ionization?

josmit_1D

How do you know when to use an ICE table? do you have to use when if given Ka or Kb?

josmit_1D

how do Ka and Kb relate to pOH and pH?

josmit_1D

why are solids and liquids not included in the equilibrium constant equation?

josmit_1D

what does the reaction quotient tells us about the equilibrium reaction?

josmit_1D

what is the general rule for change in pressure under Le Chatelier's principle?

josmit_1D

what changes in conditions does Le Chatelier's principle apply to?

josmit_1D

how do you calculate concentration from gas pressure?

josmit_1D

myoglobin transports oxygen to muscle cells. while hemoglobin carries oxygen to the blood and tissues in the body. it also helps transport carbon dioxide and hydrogen ions.

josmit_1D

yes all polydentates are chelating. polydentates bind in two or more places. the more atoms in the chelate ring the more stable the chelate is.

josmit_1D

Cobalt's most important biological function is its role in vitamin B12. B12 assists in the metabolism of folic and fatty acids. it is also used in the production of red blood cells and the functions of the nervous system.

josmit_1D

when looking at relative anion stability, you are trying to determine which had stronger induction qualities. in other words which one does a better job at pulling a negative charge away.

josmit_1D

amphiprotic means it can both accept and donate a proton.
amphoteric means it can act as both an acid and base.
therefore a substance is automatically amphiprotic if it is amphoteric.

josmit_1D

Myoglobin transports oxygen to muscle cells. it is then used in respiration to create energy.

josmit_1D

What is the biological function of cobalt?

josmit_1D

What does it mean by relative anion stability?

josmit_1D

What is the difference between amphoteric and amphiprotic?

josmit_1D

What is the biological importance of hemoglobin in relation to myoglobin?

josmit_1D

What is the biological importance of myoglobin

josmit_1D

Do all polydentates chelate?

josmit_1D

do all acid base reactions from a salt and water?

josmit_1D

are polyprotic acids/bases considered Bronsted acids/bases?

josmit_1D

what does it mean if the calculated pH is negative or above 14?

josmit_1D

are all amphoteric compounds oxides?

josmit_1D

how do you know when a compound is amphoteric?

josmit_1D

what is the most important biological application of coordination compounds/ligands?

josmit_1D

is just the part of the compound in the coordination sphere considered a ligand?

josmit_1D

why do most complexes have a coordination number of 6?

josmit_1D

can you have a coordination number less than 4/

josmit_1D

what do the brackets signify when they are around the compound?

josmit_1D

why do bond angles get smaller with more lone pairs?

josmit_1D

why does lone pair position matter when they are equatorial and not axial?

josmit_1D

when do dipoles cancel?

josmit_1D

why is a square planar molecule rare?

josmit_1D

can a molecule technically be considered two different shapes?

josmit_1D

can a lewis structure be drawn with both a octet structure and an expanded octet structure?

josmit_1D

what is the relationship between polarizability and intermolecular forces?

josmit_1D

what is the most number of electrons that a molecule with an expanded octet can have?

josmit_1D

how do you know which molecules can have an expanded octet?

josmit_1D

how do you determine if a molecule has a dipole moment?

josmit_1D

how do you know if a molecule is polar or nonpolar?

josmit_1D

Why do lewis structures with expanded octets have lower energy than octet structures?

josmit_1D

what are radicals and why are they an exception to the octet rule?

josmit_1D

How do you determine which type of bond it is based on electronegativity?

josmit_1D

why are larger ions less soluble?

josmit_1D

how do you know which ions have high polarizing power?

josmit_1D

why does fluorine tend to not make double bonds?

josmit_1D

are resonance hybrid structures usually just for carbon- hydrogen bonds?

josmit_1D

why does the ability to have resonance structures mean that a molecule is more stable?

josmit_1D

why do single, double, and triple bonds have different lengths?

josmit_1D

can someone explain how to solve the following problem: 1B.15 The velocity of an electron that is emitted from a metallic surface by a photon is 3.6 3 103 km?s21. (a) What is the wavelength of the ejected electron? (b) No electrons are emitted from the surface of the metal until the frequency of the...

josmit_1D

can someone please explain how to solve the following problem: 1.13 Ionization energies usually increase on going from left to right across the periodic table. The ionization energy for oxygen, however, is lower than that of either nitrogen or fluorine. Explain this anomaly. ?

josmit_1D

can someone explain how to solve the following problem:1.27 A team of scientists recently developed a series of nanowires (very tiny wires) that can act as miniature lasers. (a) One nanowire was found to emit light of frequency 6.27 3 1014 Hz. What was the wavelength of the light emitted? (b) A seco...

josmit_1D

can someone explain why the 3d orbital is of higher energy than the 4s?

josmit_1D

Can someone please reexplain Aufbau's principle?

josmit_1D

can someone explain how to solve the following problem: 1A.15 In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line.?

josmit_1D

Can someone explain how to solve the following problem: 1.31 In a recent suspense film, two secret agents must penetrate a criminal's stronghold monitored by a lithium photomultiplier cell that is continually bathed in light from a laser. If the beam of light is broken, an alarm sounds. The agents w...

josmit_1D

is there any case in which one photon has enough energy to eject more than one electron?

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