CHEMISTRY COMMUNITY

Savonnah Wong 1A

What is the importance of the Arrhenius equation how is temperature related to reaction rates?

Savonnah Wong 1A

Hi ! I think Dr. Lavelle mentioned that the reactants are specified first and the products last. And yes you should separate the same phase in the cell diagram with a comma instead of a single line.

Savonnah Wong 1A

While the standard reduction potential does play a role in the corrosion inhibition process, the overall effectiveness of chromium as a corrosion inhibitor for iron is primarily attributed to its ability to form a stable and protective oxide layer.

Savonnah Wong 1A

Is there a connection between activation energy and enthalpy?

Savonnah Wong 1A

What is the difference between an oxidation-reduction reaction and a half-reaction?

Savonnah Wong 1A

what other inert metals are there that we can put for the galvanic cell?

Savonnah Wong 1A

To find n, that is simply the amount of electrons you set up to balance on both sides. It doesn't matter that they cancel but that coefficient is what you input for n.

Savonnah Wong 1A

Hi! In cell notation, a vertical line, |, denotes a phase boundary and a double line, ||, a salt bridge. The anode electrode is written to the left, followed by the anode solution, then the salt bridge, then the cathode solution, and,the cathode electrode to the right. I think Dr. Lavelle said to do...

Savonnah Wong 1A

What does the dot represent in question 18 Wk7/8 achieve?

Savonnah Wong 1A

Hi! To add I thought this table on this website was helpful: https://www.onlinemathlearning.com/redox-reaction.html

Savonnah Wong 1A

And to add on to Larne's response. To balance the excess of H+ ions, you add OH- ions to form water (H2O) molecules and make the solution basic. This video was helpful for me: https://youtube.com/watch?v=N6ivvu6xlog

Savonnah Wong 1A

HI! Is there an appendix for the Standard reduction potentials or are they all on the table in 6L?

Savonnah Wong 1A

Skeleton equations have only the chemical formulas of reactants and products, but no state is mentioned. There is also no balancing of atoms on either side of the equation.

Savonnah Wong 1A

EMF is the maximum potential difference that can be reached between the electrodes of an electrochemical cell, and it causes electrons to flow through an external circuit until equilibrium is reached.

Savonnah Wong 1A

You know that the units of enthalpy of vaporization is J/mol or kJ/mol so i would kind of use the units to help solve. So you know you have to divide the q (kJ) by the number of mols to get the final units in kJ/mol! Hope this helps! - Savonnah

Savonnah Wong 1A

What is translational entropy?

Savonnah Wong 1A

why is delta G = 0 at boiling point?

Savonnah Wong 1A

work is done on the system so you know work should be positive.

Savonnah Wong 1A

Molecular vibration happens when atoms in a molecule are in periodic motion while the whole molecule has constant translational and rotational motion. A fundamental vibration occurs when one quanta of energy is absorbed by the molecule in its ground state. When two quanta are absorbed, the first vib...

Savonnah Wong 1A

to answer your first question when both volume and pressure change, i would simply use W = p Δ V .

Savonnah Wong 1A

What is an example in real life of a reversible expansion? Dr. Lavelle gave an example of paint canister cooling for the sudden expansion and was wondering what about reversible expansion.

Savonnah Wong 1A

Does reversible reaction just mean that the surrounding and system pressures change in infinitesimally small steps?

Savonnah Wong 1A

Yes! specific heat capacity are always a positive value because it's the amount of energy (heat) required to raise the system's temperature.

Savonnah Wong 1A

When specific heat capacity is in (J/g * K), is this interchangeable with (J/g * C) or do we need ot convert from K to C?

Savonnah Wong 1A

Hi! How do you know when a problem is a calorimetry problem?

Savonnah Wong 1A

when the energy of an isolated system is constant because no matter or heat can be transferred, and the system can't be physically changed. key think is an isolated system.

Savonnah Wong 1A

It can be at the same temperature but because of the large enthalpy of condesation (vapor going to liquid) there is a lot more heat than fusion transition (liquid going to solid) compare the 40.7kJ to 5kJ.

Savonnah Wong 1A

We find Percent ionization by (Number of ions produced / Total number of molecules) x 100

Savonnah Wong 1A

Hi! When should you use Hess's Law and when should you use Bond Energies?

Savonnah Wong 1A

Hi! How do you know when something is a basic or acidic salt?

Savonnah Wong 1A

A pH value can be greater than 14 for very concentrated strong bases.

Savonnah Wong 1A

Because the pH scale is logarithmic (pH = -log[H+]), a change of one pH unit corresponds to a ten-fold change in hydrogen ion concentration. For example, a solution with a pH of 3 has 10 times more H+ than a solution with a pH of 4.

value = 10^x
x=log_10 value

Savonnah Wong 1A

Yes the conjugate base of a weak acid is strong!

Savonnah Wong 1A

Hi! What are the factors affecting pKa values?

Savonnah Wong 1A

Hi! I was wondering what pKa and Ka were and how does pKa affect equilibrium?

Savonnah Wong 1A

What is the difference between the units barr and atm?

Savonnah Wong 1A

Hi! For question #9 for the Achieve Chemical Equilibria why is the x a negative value when it is solved for? In lecture, I thought Dr. Lavelle said that x could never be a negative value.

Savonnah Wong 1A

Hi! For question #9 for the Achieve Chemical Equilibria why is the x a negative value when it is solved for? In lecture, I thought Dr. Lavelle said that x could never be a negative value.

Savonnah Wong 1A

Hi! Kc is is the ratio of the equilibrium concentrations of products over the equilibrium concentrations of reactants each raised to the power of their stoichiometric coefficients! It also tells us whether the reaction tends to have a higher concentration of products or reactants at equilibrium.

Savonnah Wong 1A

Hi! I believe if you add a catalyst the equilibrium constant does not change. It simply speeds up the forward and reverse reaction.

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