CHEMISTRY COMMUNITY

harshitasarambale4I

How does this work when you have an enzyme.

harshitasarambale4I

When U=0 is w=-q always true?

harshitasarambale4I

Pick your R according to the correct units.

harshitasarambale4I

Professor Lavelle said that questions will come from the Homework and Online Assessments.

harshitasarambale4I

15.31 is not on the syllabus.

harshitasarambale4I

We can determine this trend by looking at the Arrhenius equation:
ln k = ln A - Ea/RT

harshitasarambale4I

Can you have a situation where Ecell does not equal 0.

harshitasarambale4I

I think we should do homework on the chemical kinetics section.

harshitasarambale4I

Can you use any other metals? I think the textbook might have used Au(s) before.

harshitasarambale4I

Oxidized species are losing electrons and their charge is becoming more positive.
Reduced species are gaining electrons and their charge is becoming more negative.

harshitasarambale4I

I was confused about that. In the 6th edition for 14.13, the solutions manual didn't use platinum for the reaction with nickel and zinc but used it in part b for the reaction between I and Ce, and also between H and Cl.

harshitasarambale4I

Basically you need to to do the rest of the homework questions from thermodynamics.

harshitasarambale4I

How would you determine the signs for enthalpy?

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Also remember that irreversible processes have more entropy than reversible processes.

harshitasarambale4I

I'm not sure if we can equate isothermal to equilibrium.

harshitasarambale4I

In the table, use the K values in the second column for this question.

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One of the equations we need to know is...
delta S = -delta H/T

harshitasarambale4I

Inert gasses/noble gasses are nonreactive.

harshitasarambale4I

Is this why delta U = delta H in biological systems since reactions in biological systems take place in liquids?

harshitasarambale4I

H represents the enthalpy of a system.

harshitasarambale4I

Work is the energy change in a system due to an outside force.

harshitasarambale4I

-X is usually found in the "C" or the "change" row of the ICE table. It is not used when calculating K.

harshitasarambale4I

Generally, more complex molecules have higher molar entropy. Also, molar entropy is proportional to the heat required to raise a substance to a certain temperature.
--> Entropy = heat required/final temperature

harshitasarambale4I

Does anyone know if there is a specific time on Sunday?

harshitasarambale4I

I believe it is not included when calculating K because it is a solid but I'm not sure as to why it isn't in the equation.

harshitasarambale4I

I think for net ionic equations, you would just disregard the ions that are on both sides of the equation and calculate the equilibrium constant accordingly.

harshitasarambale4I

It will be the equilibrium value divided by the initial value.

harshitasarambale4I

Yes, the question should specify. However, it is important to remember that if you are given moles of gas, you have to convert it to units of pressure using the PV=nRT equation.

harshitasarambale4I

I believe the net ionic equation is used to calculate K because spectator ions are not included when calculating K.

harshitasarambale4I

Yes temperature changes the K value. In class we said that endothermic reactions will favor product formation when heating while exothermic reactions will favor reactant formation when heating.

harshitasarambale4I

Is H- a Lewis acid or base? What would be the proton transfer equation for that.

harshitasarambale4I

Sodium is the cation and the coordinate compound is the anion. Therefore, you would leave sodium outside of the brackets.

harshitasarambale4I

How would you do part c of this question? The two strands of the nucleic acid DNA are held together by hydrogen bonding between four organic bases. The structure of one of these bases, thymine, is shown below. (a) How many protons can this base accept? (b) Draw the structure of each conjugate acid t...

harshitasarambale4I

Since bromine is bigger than fluorine, the bond length is going to be longer and weaker. This means it will be a stronger acid.

harshitasarambale4I

It also helps to look at the VSEPR formulas when determining shape name. For example, AX2E is generally always bent.

harshitasarambale4I

Hydrogen and helium are also exceptions to the octet rule.

harshitasarambale4I

I believe T-shaped does come up in the homework problems.

harshitasarambale4I

When determining the molecular shape, we consider the influence of the lone pairs on the shape, but when naming we only look at the positions of atoms. For example, in NF3, the atoms and lone pair would form a tetrahedral shape. But since we don't consider the lone pair on the N while naming, the sh...

harshitasarambale4I

The lone pair will occupy the 2sp^2 hybrid orbital. Sigma bonds will compose the hybrid orbitals while pi bonds will compose the non-hybrid orbitals.

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No they do not. The bond angles would resonate similar to the bond and bond lengths.

harshitasarambale4I

According to the textbook, a sigma bond "is cylindrically symmetrical (the same in all directions around the long axis of the bond), with no nodal planes containing the internuclear axis" whereas a pi bond is "a bond in which the two electrons lie in two lobes, one on each side of the...

harshitasarambale4I

If you draw out the resonance structures, you will notice that there are single AND double bonds. This means that these bonds have some double bond character. For part c, calculate the formal charges of your two isomers and the one with the least charge is the more favored one.

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Technically, there is only one bond length. This happens because we can make a resonance structure for this molecule. Basically, resonance relates to delocalization of electron which implies that bond length is an average of the two resonance structures (average of the double and single bonds).

harshitasarambale4I

Since hydrogen sulfite is an oxoacid, the hydrogen generally bonds to one of the oxygen atoms.

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A cation is a positively charged ion and an anion is a negatively charged ion.

harshitasarambale4I

You have to look at the formal charges. Generally we try to keep the central atom at a zero FC and the outer atoms can have negative charge if necessary.

harshitasarambale4I

Also, the number before the s, p, d, or f is the n value.

For example, in 4s. n = 4 and l = 0.

harshitasarambale4I

Unless we cover how to find them in class, I think they will likely give us the charges.

harshitasarambale4I

According to the textbook, electron affinity is the "energy released when an electron is added to a gas-phase atom" whereas electronegativity is defined as the "electron-pulling power of an atom when it is part of a molecule." I don't think they would be interchangeable because o...

harshitasarambale4I

I think this question is asking you to relate cars to the particle properties of light rather than the wave properties of light. You would still solve the question normally.

harshitasarambale4I

I believe that everything that was covered up till this Friday's lecture is going to be on the test. So basically we need to know the 4 quantum numbers and which combination of quantum numbers is valid. I would look at the diagram with boxes that visualize the shells and subshells. I would also know...

harshitasarambale4I

When we use the equation E=hv, are we supposed to leave our answer in Joules per photon or simply just Joules?

harshitasarambale4I

I don't believe that since 84 is an integer, you disregard it when considering sig figs. You always have to look at the number with the lowest number of sig figs when rounding your answer, whether it is an integer or not.

harshitasarambale4I

It is also important to remember that the metal is in a circuit. This means that the electrons in the metal will be continuously replenished, ensuring that the metal never runs out of electrons.

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The photoelectric effect is important because it helps explain the duality of light. It proves that light not only acts as a wave but also as a photon. It also helps explain certain behaviors of light that were unclear when assuming light was only a wave.

harshitasarambale4I

Magnesium sulfate heptahydrate, is actually MgSO 4 .7H 2 O The raised dot separates the water of hydration. This compound contains a hydrate so in this form, magnesium sulfate heptahydrate exists as a crystal. But when this compound is heated, the water of hydration is lost and the crystals are lost...

harshitasarambale4I

When an electron in a hydrogen atom transitions from 1s to 1p which of the following happens?
I know that energy, n, and the radius increases. Can someone explain why the value of l increases

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Change in electric field correlates to energy. Using the equation, E=hv, if frequency (v) decreases, then energy will also decrease proportionally.

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