CHEMISTRY COMMUNITY

NatBrown1I

Because the concentration of solids and liquids are constant throughout the reaction.

NatBrown1I

Zero order reactions have a constant rate and are independent of any changes in concentrations.

NatBrown1I

They're the same!

NatBrown1I

If you have a table of values (like in the video) you can see how the concentrations of each of the elements in the table and the changes in them affect the initial rate of reaction. By choosing two sets of data, you can isolate one of the elements of the reaction to compare and see the effect of on...

NatBrown1I

How do you know which half reactions to use for this question?

NatBrown1I

Why is 6N1 b) 2e- instead of 1e- ?

NatBrown1I

How do you know which equation to use for 6M7?

NatBrown1I

How come the NO3 reaction is the cathode? Isn't it being oxidized as well?

NatBrown1I

In the textbook it says that Ecell is always positive in a galvanic cell. Why is that?

NatBrown1I

Why do you add Pt in 6L5 b) and how do you know if you need to add this in any other cell diagram that you create? Also, why Pt specifically as opposed to any other element?

NatBrown1I

How do you balance basic redox reactions if OH and H2O both have O in them? (as opposed to acidic where you can just use H+ and automatically balance the equations)?

NatBrown1I

How can you tell which is the catalyst in the reaction?

NatBrown1I

Why is OH not an intermediate in 7E5 (7th edition)?

NatBrown1I

What is the difference between using (T'-T/T'T) and (1/T1-1/T2) for the activation energies? The textbook talks about one, but the solutions use both in different problems.

NatBrown1I

How can you tell what is an intermediate in a reaction?

NatBrown1I

Can someone explain this question in the 7th edition of the textbook? I don't quite understand the answer.

NatBrown1I

What are the rate equations that we need to know/ what will we be given?

NatBrown1I

What is the difference between rate law, rate constant, and overall rate of reaction?

NatBrown1I

What does 0 order mean versus independent of rate?

NatBrown1I

For ice tables, the goal is to find out what the concentrations are at equilibrium, knowing that the reaction is at equilibrium. You calculate Q in order to find out whether or not the reaction is at equilibrium.

NatBrown1I

If you increase the partial pressure on one side of the equation, the other side will be produced more and the reaction will shift to that side.

NatBrown1I

I is for the initial concentration
C is for the change in concentration
E is for the equilibrium concentration (essentially the I plus/minus the C)

NatBrown1I

Why is the concentration used 3.1 x 10^-3 and not just 3.1?

NatBrown1I

Does it matter whether or not when you're calculating K to use this notation [PCl5] or this notation P PCl5 ?

NatBrown1I

What is the difference between K and Kc as can be seen in table 5G2 in the 7th edition of the textbook? In which case would it be useful to use K and in which case is it useful to use Kc?

NatBrown1I

What are some examples of common strong/weak acids and bases that we would have to know or would be useful to know?

NatBrown1I

You shouldn't round your answer until you are finished calculating everything

NatBrown1I

It's every Sunday by 11:59, but I'm not sure that it is really stressed too much.

NatBrown1I

If Q>K then there will be more products than reactants and therefore the reverse reaction will be favoured
If Q<K then there will be more reactants than products and therefore the forward reaction will be favoured

NatBrown1I

If you have already established equilibrium what will happen when you increase the concentration of the reactants?

NatBrown1I

Why is it true that if Q is smaller than K there are more reactants than products and therefore the forward reaction is favoured. If there are more reactants than products, wouldn't that mean that the reverse reaction is favoured?

(Like in example 5I.11b in the textbook)

NatBrown1I

Why does the De Broglie equation use kg instead of grams?

NatBrown1I

Yes they are in chapter 9 if the textbook and we went over them in class.

NatBrown1I

What is the empirical formula when mass is not equal to 100?

NatBrown1I

One less than the electron groups that surround it (lone and bonding pairs)

2 = sp
3 = sp2
4 = sp3
5 = sp3d
6 = sp3d2

NatBrown1I

I'm pretty sure my TA said that we won't be given a list like that, however, it's not really an emphasis from this course to memorize those. She said that we'll get to know them as we use them through practice questions and that should be enough. We'll be given the cover sheet that we always get at ...

NatBrown1I

The first bond is a sigma bond and the next two are pi bonds.

NatBrown1I

What is the difference between the term bent and angular?

NatBrown1I

Does a bond with a resonance structure have a higher or lower energy than a regular bond of the same type?

NatBrown1I

Just found it! The degree of covalent character increases with increasing charge density of a cation and increasing size of an anion.

NatBrown1I

What defines covalent character and polarizability?

NatBrown1I

A regular covalent bond takes place when two atoms share a pair of electrons, however, in a coordinate covalent bond, these two atoms share electrons that come from the same atom.

NatBrown1I

Are intramolecular forces or intermolecular forces easier to break?

NatBrown1I

What is the average time a London Dispersion force will act upon 2 molecules for?

NatBrown1I

Why does every molecule have London forces?

NatBrown1I

What is the difference between ionic and atomic radius and their trends?

NatBrown1I

On tests will we be required to draw all possible resonance structures (like in IB) for a question that asks for a drawing of a structure that has resonance?

NatBrown1I

Depending on the specific variables that you have you can use either the equation:
E= hv
or
E = hc/ lambda

The second equation is just a combination of the first equation and lambda = c/v.

NatBrown1I

What are the responsibilities for the n, l and ml quantum numbers? What do they describe?

NatBrown1I

Why is the DeBroglie equation in metres instead of kilometres?

NatBrown1I

The balmer series results from electron transitions between high energy levels to an energy level that has a principal quantum number that equals 2, the lyman series is the same but with a principal quantum number of 1, and the paschen series is the same but with a principal quantum number of 3.

NatBrown1I

What is the difference between orbital and spin momentum?

NatBrown1I

What are the standard units for the wavelength equation?

NatBrown1I

Is it necessary to know the names for different regions of light and memorize their wavelengths like was required in the homework problems?

NatBrown1I

Why is there a - sign in front of the equation E= -hR/n^2?

NatBrown1I

What is the difference between the Rydberg equation and E= -hR/(n)^2?

NatBrown1I

Actual yield is the value that the problem will give you and is the value that you would get if you were doing an experiment (which is usually less than the theoretical value). Theoretical yield is the yield that you will need to calculate based on the mass values or molar values given to you in the...

NatBrown1I

For the element carbon for example (which is pictured here) the number 6 represents the atomic number (the number of protons in the atom) and the number 12.011 is the atomic mass of an element, which is an average of the mass of all of the isotopes of that particular element.

NatBrown1I

You just go with the values you see that have the least amount of significant figures. For example, if you have a question that involves calculations with the numbers 1.3005 and 7.69, then you would do the entire question and all the calculations without rounding until you get the answer- to which y...

NatBrown1I

Here's a pretty helpful flowchart I drew the other day to use whenever you try converting from a particular unit to another unit!

In order to get formula units from moles you would multiply by Avogadro's number (6.022 x 10^23) by the number of moles that you have.

Hope this helps.

NatBrown1I

Yes molar mass is just a capital M which always expressed in the units g/mol. It is the mass of a substance (in grams) divided by its particular amount (in mols).

NatBrown1I

How come you would only need 3 more atoms of At to balance with the 9 atoms of gallium? Wouldn't you need 3x as many atoms?

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