CHEMISTRY COMMUNITY

Anmol_cheema_2F

Molecularity refers to the number of reactants in an elementary reaction so a bimolecular reaction contains two reactants.

Anmol_cheema_2F

The half lives are provided on the formula sheet.

Anmol_cheema_2F

the y axis is lnk as can be seen in the equation lnk= -Ea/RT + lnA

Anmol_cheema_2F

The half life of a reactant is simply the time needed for its concentration to fall to 1/2 its initial value.

Anmol_cheema_2F

I heard the test 2 average was around a 36/50.

Anmol_cheema_2F

I think the midterm average was 80%.

Anmol_cheema_2F

The sign of delta G is dependent on enthalpy, temperature, and entropy so entropy doesn't necessarily have to be negative; it depends on all three.

Anmol_cheema_2F

Even if T is given in Celsius, you can just add 273 to get Kelvin but yes you will need to use K in the actual calculation.

Anmol_cheema_2F

Usually an inert solid like Platinum is added when a solution does not already have a conducting solid.

Anmol_cheema_2F

When change in Gibbs free energy is negative, the reaction is spontaneous; when delta G is positive, the reaction is not spontaneous.

Anmol_cheema_2F

The anode is where oxidation takes place (electrons leave) and the cathode is where reduction takes place (gains electrons).

Anmol_cheema_2F

I don't believe it will cover old stuff, but it covers Gibbs free energy and electrochemistry (everything covered in week 6 and 7 lectures).

Anmol_cheema_2F

Yes, thats right. The bonds broken (reactants) require energy and are endothermic/positive. The bonds formed (products) release energy and are exothermic/negative.

Anmol_cheema_2F

It should take about a week, so hopefully by the end of week 7.

Anmol_cheema_2F

A state function does not depend on the path taken to achieve that state. This includes density, internal energy, enthalpy, etc.

Anmol_cheema_2F

Yes, the midterm covers outlines 1-4 up until entropy; it does not cover Gibbs free energy.

Anmol_cheema_2F

The midterm does not cover Gibbs free energy.

Anmol_cheema_2F

yes, just look up hotdog!

Anmol_cheema_2F

open system- matter and energy can exchange with surroundings beaker of water- water can evaporate and breaker does not insulate closed system- energy can exchange with surroundings sealed beaker of water does not insulate isolated system- nothing exchanges with surroundings combustion of glucose in...

Anmol_cheema_2F

The date is listed on the website and is February 13, 6-8pm (week 6).

Anmol_cheema_2F

This equation shows the relationship between pressure, volume, moles, gas constant, and temperature and can be moved around to find these different values.

Anmol_cheema_2F

Yes, both of these are equal to one another.

Anmol_cheema_2F

When K is less than 10^-3, you can neglect x because it will probably be small enough to where it does not have any significant effect on the calculation.

Anmol_cheema_2F

Yes, both can be found using an ICE table.

Anmol_cheema_2F

Le Chatelier's principle simply states that chemical reactions adjust so as to minimize the effect of changes. For instance, if more reactant is added, more product will form to account for this change.

Anmol_cheema_2F

Homework is now due in every discussion section.

Anmol_cheema_2F

Post by 11:59 on Sunday night.

Anmol_cheema_2F

Their effect is not significant enough to be taken into consideration.

Anmol_cheema_2F

Kp helps specify that the question is asking for partial pressures for gases instead of the equilibrium constant for concentrations.

Anmol_cheema_2F

Both Q and K use the same formula.

Anmol_cheema_2F

Since there are four areas of electron density, it is sp3.
2=sp 3=sp2 4=sp3 5=sp3d 6=sp3d2

Anmol_cheema_2F

Due to the shape, they are polar.

Anmol_cheema_2F

Bent and angular are the same thing.

Anmol_cheema_2F

Sigma bonds overlap side by side.

Anmol_cheema_2F

You can usually tell from a lewis structure is a molecule is polar by seeing if they're dipole moments cancel out, which usually happens based off their symmetry.

Anmol_cheema_2F

Dipole moments depend on polarity and polarity depends on electronegativity, so dipole moments are dependent on these things.

Anmol_cheema_2F

Basically the formula can be see as FC= # of valence electrons-( # of dots + # of lines)
the # of dots are just the lone pairs and the # of lines is just the S/2 or number of bonds between atoms

Anmol_cheema_2F

Yea so it covers the whole Molecular Shape and Structure unit (look at outline 4) and section 2D from the previous Chemical Bonds unit (look at outline 3).

Anmol_cheema_2F

According to the syllabus, final grades won't be known until the class average is known at the end but there is no curve and a 50% is considered passing with a C-

Anmol_cheema_2F

I'm not sure but I would play it safe and post weekly so you remain active on the website.

Anmol_cheema_2F

I believe so but he will also adjust the grading scale according to the amount of points people tend to have by the end of the course.

Anmol_cheema_2F

I believe that there is no class on Wednesday.

Anmol_cheema_2F

Single bonds are longer than double and triple bonds, however the shorter bonds are the strongest.

Anmol_cheema_2F

isoelectronic: having the same numbers of electrons or the same electronic structure.

Anmol_cheema_2F

Electron affinity: the energy change when a neutral atom attracts an electron to become a negative ion.
Electronegativity: the ability of an atom in a molecule to draw bonding electrons to itself.

Anmol_cheema_2F

A nodal plane is where the wave function passes through 0 and the probability of finding an electron there is 0. Essentially the number of nodal planes is equal to l, the angular momentum quantum number.

Anmol_cheema_2F

The Midterm covers Fundamentals, Quantum, Bonding to end of 3.11 (6 Ed.) and to end of 2C (7 Ed) which was up until Wednesday's lecture.

Anmol_cheema_2F

All electrons that have the same value for n are in the same shell. Within a shell (same n), all electrons that share the same l (the angular momentum quantum number, or orbital shape) are in the same sub-shell When electrons share the same n, l, and ml, we say they are in the same orbital (they hav...

Anmol_cheema_2F

It depends on the question because it could ask for all possible values or just one.

Anmol_cheema_2F

The number of nodal/radial planes is equal to the value of l. Therefore, s has 0, p has 1, and d has 2.

Anmol_cheema_2F

E represents the energy of the photon, while the work function is the minimum energy needed to remove an electron.

Anmol_cheema_2F

I believe he said that we would not need to know about black body radiation.

Anmol_cheema_2F

In the equation (c)=wavelength(lambda) x frequency(v), the speed (c) is a constant. Therefore if wavelength increases, frequency must decrease and vice versa because c must remain the same.

Anmol_cheema_2F

I believe this test will only cover the quantum world section, however, it may be useful to remember and apply content from the previous section.

Anmol_cheema_2F

I'm pretty sure our TA said there will be partial credit and that being off a few significant figures won't matter much.

Anmol_cheema_2F

The prefix "milli" represents a factor of 10^-3, so a mmol Is 10^-3 mol.

Anmol_cheema_2F

The TA said we will be getting scores in discussion, I don't think there is any way to get them before that.

Anmol_cheema_2F

If you were trying to pour exactly 5 mL of water in a beaker and the first three times you poured 5, 5.1, and 4.9, then your accuracy and precision is pretty high because it's close to 5 and the numbers are close together. Precision is related to repeatability so if the next three times you poured 5...

Anmol_cheema_2F

I believe we just get the periodic table so I would be safe and memorize the main formulas we have been working with. However, you can always ask or email the TA.

Anmol_cheema_2F

If the number is within about .1, then round to the nearest whole number.

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