CHEMISTRY COMMUNITY

Glendy Gonzalez 1A

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Glendy Gonzalez 1A

In the final, would we have to identify the functional groups from complex molecules or when they are alone?

Glendy Gonzalez 1A

The answer should be E=-0.037V

Glendy Gonzalez 1A

How do you solve question #3 on the kinetics test?

Glendy Gonzalez 1A

What role do enzymes play in kinetics?

Glendy Gonzalez 1A

I am pretty sure it should be specified which one is the slow and fast reaction. I am not sure about the intermediate though.

Glendy Gonzalez 1A

What are unique rates? Do we need to know that for test 3?

Glendy Gonzalez 1A

Half lives can allow you to determine the age of an artifact/fossils, measure radioactive decay, and many other things.

Glendy Gonzalez 1A

How can you identify a zero order reactant based on a table? Is there a "shortcut"?

Glendy Gonzalez 1A

Thank is the general law, but as mentioned before the exponents would change depending on the order of the reactants.

Glendy Gonzalez 1A

For part a. in the solution manual the value of Q is 10^6, but I keep getting 3269017. What am I doing wrong? Isn't the e^15=3269017.

Glendy Gonzalez 1A

The slow step is known as the rate determining step in a reaction mechanism. This step is simply the one with the slowest rate.

Glendy Gonzalez 1A

When anazyling initial reaction rates, why do we only focus on the reactant concentration?

Glendy Gonzalez 1A

When solving for [H+], when you subtract standard E from E wouldn't the answer be negative? I keep getting -0.079 but the solutions manual has a positive value. What am I doing wrong?

Glendy Gonzalez 1A

Yes, you use H+ in acidic solutions and OH- in basic solutions.

Glendy Gonzalez 1A

In this problem, P4 is both the reducing and oxidizing agent. Therefore, you can start by separating and balancing both half-reactions. Remember, you start with P4 in both reactions. After balancing them you can combine them in order to get the final equation.

Glendy Gonzalez 1A

Yes, You use H20 to balance the Oxygens and H+ or OH- to balance the hydrogens.

Glendy Gonzalez 1A

Is there a set of "rules" or order in which half-reactions should be balanced? Like do you add H20 or OH- first?

Glendy Gonzalez 1A

will the midterm focus on Van't Hoff ?

Glendy Gonzalez 1A

How can you determine the degeneracy of cis-MX2Y4 and trans-MX2Y4?

Glendy Gonzalez 1A

In simple terms, what is the difference between a reversible and irreversible expansion? How can you quickly identify them in a problem?

Glendy Gonzalez 1A

Can someone please explain why in an isothermal expansion the external pressure cannot be greater than the internal pressure.

Glendy Gonzalez 1A

Technically, you can have a negative entropy. It would just mean it is not favorable and would not occur frequently.

Glendy Gonzalez 1A

How does work affect free energy? is there a relationship between these two terms?

Glendy Gonzalez 1A

Can someone explain how reaction free energy depends on pressure and equilibrium constant, please?

Glendy Gonzalez 1A

I don't think there is a heat capacity trend of the periodic table because heat capacities depends on different factors, such as change in temperature, the system, and its mass. As well as the substance and its phase.

Glendy Gonzalez 1A

Degeneracy refers to the number of ways of obtaining a certain energy state. Degeneracy and entropy are inverses of each other. That is, the higher the degeneracy, the lower the entropy.

Glendy Gonzalez 1A

Since we should not use the concept of disorder when defining/explaining entropy, what would be the correct definition? How would you explain entropy?

Glendy Gonzalez 1A

Can someone please explain me how can you calculate the enthalpy of formation for 2HCl(aq)+Zn(s) ---> H2(g)+ZnCl2(aq). I can't find the enthalpy value for ZnCl2.

Glendy Gonzalez 1A

You will have to use the units KJ/mol whenever you are asked to calculate the enthalpy of a reaction for 1 mole of a reactant/product.

Glendy Gonzalez 1A

In problem 8.73 why are the bond enthalpies for C-H not included?

Glendy Gonzalez 1A

In test #1, would there be questions regarding heating curves? That is, problems in which we would need to calculate the energy needed for one substance to go from one state to another.

Glendy Gonzalez 1A

Can someone please explain the difference between an open, closed, and isolated system? How can you identity/differentiate them?

Thank you!

Glendy Gonzalez 1A

-When heat is being transferred into the system, q>0 (q is positive)
-When heat is being transferred out of the system, q<0 (q is negative)

Glendy Gonzalez 1A

Can someone please explain why the molar heat capacity is higher for complex molecules? How does bond vibrations affect heat capacity?

Glendy Gonzalez 1A

Based on a balanced chemical equation, how can you calculate the net number of moles of gas produced?

Glendy Gonzalez 1A

Why are weak bases not completely ionized? How do weak and strong bases differ?

Glendy Gonzalez 1A

If a reaction is exothermic and the temperature is increased, the reaction will shift to the left in order to reduce the temperature. When the reactants are favored, more heat is absorbed (Which helps absorbed the extra heat and reach equilibrium again).

Glendy Gonzalez 1A

Whenever solvents are liquids or solids they are not in included in equilibrium constant expressions. This is because the change in solvent concentration is insignificant.

Glendy Gonzalez 1A

Something important to keep in mind is that solids and liquids are not included in k expressions.

Glendy Gonzalez 1A

If initial concentrations are given, you would add/subtract that concentration by the value by which the molar concentration changes (the x value).

Glendy Gonzalez 1A

Does anyone know if bond order would be a big component of test 4? I don't really remember discussing about it in class.

Glendy Gonzalez 1A

What is the differential between cis- and trans-? How do you know when the isomer is cis- or trans-?

Glendy Gonzalez 1A

In order to determine the bond order, add the number of bonds in that compound and divide that by the total number of atoms.

Glendy Gonzalez 1A

A BO=1.5 means that the compound has resonance structures. Therefore, all the bonds have the characteristics of both single and double bonds.

Glendy Gonzalez 1A

In simple words, the term delocalized pi bond is used to describe a pi bond that can move around in the different resonate structures of a molecule.

Glendy Gonzalez 1A

Can someone please explain how you can determine when a ligand can be polydentate? what makes a ligand polydentate?

Glendy Gonzalez 1A

Can someone please explain what diagonal relationships are? And provide examples to help me visualize them, if possible.

Glendy Gonzalez 1A

The answer is Ultraviolet light. I think that one of the reason is because ultraviolet light has a relatively small wavelength, which results in high frequency. As we have learned, high frequency results in high energy. Therefore, more electrons were able to be transmitted under ultraviolet light. D...

Glendy Gonzalez 1A

Can someone please explain Cartesian axes and how can the orientation of orbitals be described using this term, please?
Thank you

Glendy Gonzalez 1A

I think any of these two values will be okay. Using 3.00*10^8 will only give you easier values to work with.

Glendy Gonzalez 1A

Can someone please explain what happens when the frequency of electromagnetic radiation decreases?
Based on the textbook, the answer is (c). the extent of the change in the electrical field at a given point decreases. But I don't know why or how to explain it.

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