CHEMISTRY COMMUNITY

andrea guzman 1F

HI the activation energy of the reverse reaction is Ea(forward) - $\Delta$ H because it accounts for the energy need to go back of the Ea hill.

andrea guzman 1F

The function of the salt bridge in an electrochemical cell is to maintain electrical neutrality by allowing there to be a flow of ions between cells.

andrea guzman 1F

Hi an oxidation reaction loses electrons and become more positive and an reduction reaction gain electrons and becomes more negative. The oxidation reaction occurs in the anode and the reduction reaction occurs in the cathode.

andrea guzman 1F

HI intensive properties depend on the types of matter not the amount of matter. While extensive properties depend on the amount of matter. Cell potentials are an intensive property and do not rely on the amount of matter

andrea guzman 1F

the overall reaction rate is determined by the slowest step and any intermediates in that step would be replaced by solving for them in term of other reactants in other steps

andrea guzman 1F

How would a positive $\Delta$ G on electrolytic affect equilibrium?

andrea guzman 1F

The regent with the most positive standard reduction potential would oxidize the best

andrea guzman 1F

hi an intermediate is a product that is produced and consumed so it is not a part of the overall reaction.

andrea guzman 1F

n would be the number of electrons transferred after both half reactions are balanced.

andrea guzman 1F

if there are no solids, does the conductive metal have to be the same on both the anode and cathode side?

andrea guzman 1F

how does expansion/compression affect where the equilibrium lies in a reaction?

andrea guzman 1F

hi catalysts lower the activation energy so they make it easier for the reaction to over come the activation energy hill.

andrea guzman 1F

Under what conditions would delta H be zero and the reaction would be spontaneous?

andrea guzman 1F

in simple steps how do you determine the order of a reactant using data from an experiment table that has initial concentration ad initial rate?

andrea guzman 1F

HI in the anode the oxidizing reaction occurs while in the cathode the reduction reaction occurs.

andrea guzman 1F

Hi how would we derive the third order integrated rate law and half-life?

andrea guzman 1F

hi an oxidizing agent is reduced and an oxidizing agent with a higher reduction potential has a higher probability of being reduced compared to ones with lower reduction potentials.

andrea guzman 1F

HI, catalysts can be found on the reactants side of the reaction and they are not consumed in the reaction unlike intermediates which are.

andrea guzman 1F

Hi to find the activation energy of the reverse reaction you would use Ea -delta H

andrea guzman 1F

there is still a transfer of electrons in order to balance it so n=2.

andrea guzman 1F

Hi instantaneous rate of change is the rate of change of a single point and you would use the tangent line while avg rate of change would use two points on the curved line. To solve is problem would need to find the slope of two points on tangent line which would give you the instantaneous rate of c...

andrea guzman 1F

How do you distinguish between reversible and irreversible reactions in problem? Are there any key words that a question will have to indicate whether a reaction is reversible or irreversible?

andrea guzman 1F

How do linear molecules or nonlinear molecules affect heat and internal energy?

andrea guzman 1F

Can an entropy change be through an irreversible process and be isothermal as well? If so what entropy equations would apply to these conditions?

andrea guzman 1F

How does constant pressure affect entropy change and how does constant volume affect entropy change?

andrea guzman 1F

A constant volume calorimeter was calibrated by carrying out a reaction to release 1.75 kJ of heat in 0.500L of solution in the calorimeter (q= -1.75 kJ), resulting in a temperature rise of 3.43 C. In a subsequent experiment, 250.0 ml of of 0.10 HClO 2 (aq) and 250.0 ml of 0.10 NaOH (aq) were mixed ...

andrea guzman 1F

Consider the following reaction at 298 K
C(graphite) + 2H₂ (g) -> CH4 (g) delta H= -74.6 kJ
Whats the difference between solving change in entropy of the system, change in entropy of the surroundings, and change in entropy of the universe?

andrea guzman 1F

Can a reaction have multiple catalysts and if so under what conditions would this be observed?

andrea guzman 1F

What is the difference between a catalyst and an intermediate if they both get cancelled out of the final balanced reaction?

andrea guzman 1F

If you combine 430 ml of water at 25 C and 130 ml of water at 95 C what is the final temperature of the mixture? Use 1.00g/mL as the density of water I have mc dT (cold water) = - mc dT (hot water) and dT (cold water)= (T final - 25C) dT (hot water)= (T final - 95C) but when i solve for final temper...

andrea guzman 1F

The Ka of a monoprotic week acid is 0.00577. What is the percent ionization of a 0.198 M solution of the acid?

I keep getting variations of 17% how do I go about solving this question do I need to use the quadratic equation?

andrea guzman 1F

How can delta G be related to equilibrium? or K?

andrea guzman 1F

Evaluate the unknown quantity in each of the following cells:
a) Pt| H2 (1 bar) | H+ (pH=?) || cl- (1 M) | Hg2Cl2 | Hg
Ecell= 0.33V

Im having trouble understanding how the text book solution goes from:
0.06V = -0.0257 V ln [H+] = -0.0257V x(2.303 log [H+])
to
pH= 0.06V/ (2.303)(0.025693V) = 1.0

andrea guzman 1F

Arrange the following metals in order of increasing strength as reducing agents for species in aqueous solution:

How do we distinguish between strong reducing agents and weaker reducing agents?

andrea guzman 1F

Write the cell diagram
(d) O3 / O2, OH- and Ag+/ Ag
for the cell diagram why is OH- included besides it being listed as the problem? How would we know that OH- would need to be included as a part of the cell diagram?

andrea guzman 1F

When writing cell diagrams does the order in which the ions / solids/ gases within the anode or cathode part are written?
for example in the anode part should it be written as Ag (s)| Ag ^3+ or can it be written as Ag^3+ (aq) |Ag(s)?

andrea guzman 1F

Write the write the cell diagram c) Cl 2 (g) + H 2 (g) -> HCl I got the balance rxn to be Cl 2 (g) + H 2 (g) -> 2Cl- + 2H+ I'm confused as to why the cathode part of the cell diagram is Cl-|Cl 2 (g) The cathode is the reducing reaction so I'm confused as to why Cl- is listed before the Cl2 (g) ?

andrea guzman 1F

The question is asking to determine the factor by which the catalyzed reaction is faster than the uncatalyzed reaction at 352 K uncatalyzed Ea= 134 KJ/mol catalyzed Ea = 83 KJ/mol i keep getting e^-28.23/e^-45.58 = 3.43x10^7 I was able to do the first part of the question and I'm using the same step...

andrea guzman 1F

What will be the initial rate be if [A] is tripled and [B] is halved?
I know that because [A] is tripled and its first order then the initial rate will be multiplied by 3 but for [B] which is second order is the exponent divided by 2? to then have a factor of k(3)(1)?

andrea guzman 1F

HI the question is asking what the initial rate will be if [A] is halved and [B] is tripled.
A+ B-> C + D rate= k[A][B]^2
initial rate = 0.0280 M/s
I have looked at the feedback and i have (1/2) for a since its being halved but I'm not sure if B would be 3(2) or 2^3.

andrea guzman 1F

Would the most stable resonance structure of a molecule be the one where formal charges are opposite each other and cancel out?

andrea guzman 1F

Is a negative pH possible in the the pH scale? Is it a concept where it's possible in theory but not in real life?

andrea guzman 1F

I know that in relation to weak bases the one that produces the most OH- are the stronger of the pair. But if they both produce the same amount of OH- and are both weak bases how would we determine which is the stronger base of the two?

andrea guzman 1F

Why are KCl and LiNO3 salts neutral?

andrea guzman 1F

determine the [OH-] of a solution with [H+] of 8.7x10^-11 M at 25 C
I was able to calculate the pH=10.1 and pOH= 3.9, how would I calculate the [OH-]? the achieve explanation doesn't make sense to me.

andrea guzman 1F

hi, why is H3PO4 not considered a bronsted acid and base?

andrea guzman 1F

are lewis acids and bases the same as Bronsted acids and bases?

andrea guzman 1F

is the conjugate acid of a strong base weak? and does that mean that the conjugate acid of a weak base is strong?

andrea guzman 1F

is the electron arrangement the same as the molecules's geometry name?

andrea guzman 1F

If two atoms in a pi bond rotate then the pi bond breaks, what could cause the pi bond to break?

andrea guzman 1F

what would be an example where you would have to use the prefixes such as bis, tris, tetrakis, pentakis?

andrea guzman 1F

What was the relationship between cisplatin in cis and trans molecules?

andrea guzman 1F

Would a central atom with 3 lone pairs and 2 bonding atoms also be considered linear?

andrea guzman 1F

What is the significance of pi bonds not allowing bound atoms to rotate, what implications would this have on a molecule?

andrea guzman 1F

Can someone walk me through part a) what is the limiting reactant for the formation of P4P10?
P4 +3O2 ->P4O6
P4O6 + 2O2 -> P4O10

andrea guzman 1F

Is it theoretically possible for there to be hybridization using f orbitals or are d orbitals that highest orbitals that can be used in hybridization ?

andrea guzman 1F

Why is Ba[FeBr4]2 coordination number 4 and not 2?

andrea guzman 1F

How do intermolecular forces influence the viscosity of a liquid?

andrea guzman 1F

Are the only intramolecular forces a non polar molecule can have are dispersion forces?

andrea guzman 1F

Are ion dipole interactions an ion interacting with a water molecule or are there any other examples? The example used in lecture was Cl- and H2O but I want to know if there are other example that break away from using H2O as the dipole part of the interaction

andrea guzman 1F

Identify the hydrogen crosslink between the two polymer chains.
hi i was just wondering why F would not be considered the answer if theres an H-O bond?

andrea guzman 1F

Why is HCl considered covalent and not ionic if it has the same oxidation numbers has NaCl?

andrea guzman 1F

Copper(ii) nitrate reacts with sodium hydroxide to produce a precipitate of light blue copper(ii) hydroxide.
(a) write the net ionic equation for the reaction.
is the net ionic equation just the ions that make the precipitate as reactants and the precipitate as the product?

andrea guzman 1F

When it comes to an unpaired electron when do you know just to leave it be rather than having it bond with another if the central atom does not follow the octet rule?

andrea guzman 1F

How do you determine dipole moments in a molecule, is it based off oxidation number?

andrea guzman 1F

When using the Werner Heisenberg equation for this question do we just need to plug in the values we're given? In order to solve for uncertainty would delta v always be given, if not how would we solve for obtain delta v?

andrea guzman 1F

Hi, I'm reviewing past assignments and for this question I can't figure out the second part where it asks to determine the electron affinity of thulium in units of kilojoules per mole, I keep getting 9.92.

andrea guzman 1F

Hi, i was just wondering whether there would be a difference in pi bond length in a diagram demonstrating triple and double bonds.

andrea guzman 1F

hi, the sigma bond only accounts for single bonds, and pi for double and triple bonds

andrea guzman 1F

Hi, why is C6H12 geometry a tetrahedral when its shaped in a ring?

andrea guzman 1F

hi, sigma bonds can no be delocalized because they are single bonds, delocalized electrons are in resonance structures and there are no resonance structures in single bond molecules

andrea guzman 1F

the correct notation would be sp3d the 3 belongs to the three p orbitals being used

andrea guzman 1F

I know that hydrogen bonding is a form of dipole dipole but which bond/force would be stronger, a hydrogen bond or any polar dipole dipole force?

andrea guzman 1F

hi there,
if there are two lone pairs and three atoms around the central atom, there would be 5 areas of electron density making molecular shape the t-shape.

andrea guzman 1F

carbon has 4 valence electrons: 2s^2 and 2p^2, here there are only 2 un paired electrons in the p orbital which would mean that carbon can only form two bonds. In CH4 carbon forms 4 bonds and in order to do so it needs 4 unpaired electrons, so one electron from 2s^2 is moved to the empty 2pz. This p...

andrea guzman 1F

double bonds and triple bonds do not affect molecular shape because they both take up one unit of electron density, so CO2 would also be linear regardless of the double bonds.

andrea guzman 1F

Which substance in the pair is likely to have the higher melting point : c) CHI3 or CHF3
can someone explain why its CHF3 ?

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