CHEMISTRY COMMUNITY

Frenz Cabison 1B

When do we use w= -Pexdelta v? When do we use w=-nRT ln (V2/V1)?

Frenz Cabison 1B

For 8.85.c, I was looking through the solutions manual and I was wondering where 0.492 kJ come from.

Frenz Cabison 1B

How do you know which experiments to choose in determining the order when some experiments have the same concentration and initial rate???

Frenz Cabison 1B

Since the test is only gonna be from 15.1-6, hw prob 45 onwards won't be on the test right????

Frenz Cabison 1B

Where did ln [A]_t / [A]_o = -kt come from? I was looking at the formula sheet thinking it was an original formula, but I think it is derived???

Frenz Cabison 1B

Can someone explain to me how the reaction is 2nd order in B?

Frenz Cabison 1B

For Problem #11, what was the significance of the temperature in the problem? Do we simply ignore the temperature?

Frenz Cabison 1B

Are unique reaction rates always positive?

Frenz Cabison 1B

What are the units of k in zero-, first-, and second- order reactions? How are these units derived?

Frenz Cabison 1B

How does K limit the rate of a reaction?

Frenz Cabison 1B

I was looking through my notes and in one of the lecture slides, it says that it is easier to study initial rate when very little product is present. Why is this the case?

Frenz Cabison 1B

How do we determine if something is zero-, first-, or second- order reaction?

Frenz Cabison 1B

Is order related to the reaction stoichiometry? Why or why not??

Frenz Cabison 1B

Is it true that the slope of a tangent line for products is always positive? If so, why?

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What is the significance of the negative sign in the equation -1/a delta[A]/delta t?

Frenz Cabison 1B

When do we put a Pt on the cell diagram?

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What does the Nernst equation exactly tell us?

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How does concentration affect cell potential?

Frenz Cabison 1B

Hi! This is kind of random, but when we're converting from Celsius to Kelvin, does Lavelle want us to add 273.15 or just 273???

Frenz Cabison 1B

There's this T/F statement in the practice MT. It is question 1E. Why is the statement "removing heat from a system is exothermic, so temperature must decrease" false? I remember someone said to refer to the graph during the review session, but I don't quite understand the concept behind it.

Frenz Cabison 1B

I get that heavy molecules have higher "vibrational energy state." What exactly is vibrational energy state and how does it contribute to the molecule's entropy?

Frenz Cabison 1B

Why is it possible to calculate the entropy of vaporization for water at room temperature? It is in the review session practice test (question 3c). The statement was "One cannot calculate the entropy of vaporization for water at room temperature because water has a boiling point of 373 K" ...

Frenz Cabison 1B

What does the Van't Hoff Equation exactly tell us? What do we use it for?

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Why does gas expand if delta U is zero? I quite don't understand the concept behind this statement.

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Why do all real processes have to be irreversible?

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What does the Boltzmann Equation exactly tell us? What do we use it for?

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Can someone explain why gas atoms will never spontaneously go back to smaller volume? I sort of do not understand the concept behind this statement.

Frenz Cabison 1B

So the question was:

And here is the solution from the manual:

Can someone explain why we have to reverse the second equation? Shouldn't H2(g) be on the reactant side?

Frenz Cabison 1B

How does adding or removing an amount of a substance in an open system affect the energy of that system?

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What do we need to keep in mind in regards to determining whether work is done by or on the system?

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A closed system can exchange energy with the surroundings, but it cannot exchange matter.
An isolated system can neither exchange energy nor matter with the surroundings.

Frenz Cabison 1B

We use a calorimeter to measure the amount of heat energy, which I think we can then use to calculate the specific heat of a substance.

Frenz Cabison 1B

Boiling a soup in an open saucepan is an example of an open system because both matter and energy are being exchange with the surroundings. If you put a lid on the saucepan, it becomes a closed system because while the energy is being exchanged, it has a fixed amount of matter.

Frenz Cabison 1B

It is sometimes confusing to determine whether a system is a closed or isolated. How do we differentiate the two? I get that in a closed sytem, a matter cannot enter or leave it, but how do we know that if a system is not necessarily isolated?

Frenz Cabison 1B

The textbook says that,

Metals form basic oxides, nonmetals form acidic oxides; the elements on a diagonal line from beryllium toward polonium and several d-block metals form amphoteric oxides.

How do we know if a d-block metal truly forms amphoteric oxides?

Frenz Cabison 1B

What are the rules for determining the significant figures in pH or pOH? It is mentioned last night during the review session that only decimals in pH/pOH count for significant figures. Is this correct?

Frenz Cabison 1B

How do you distinguish a Lewis acid from a Bronsted acid?

Frenz Cabison 1B

How does heating favor the formation of reactants when the reaction is exothermic while forming product?

Frenz Cabison 1B

Why is a molecule polar when the central atom has one lone pair of electrons? Can we determine the polarity of a molecule just by looking at the number of lone pairs?

Frenz Cabison 1B

When we are asked to find the expected bond angle, do we have to be very specific or can we just give an estimate? For example, on problem 4.21 (d), N2H4 is trigonal pyrmidal and so the bond angle is 107° according to the answer key. If we say that the bond angle is slightly less than 109.5°, would ...

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How do transition metals bound to cage-like molecule?

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Why can't pi bonds allow bond atoms to rotate?

Frenz Cabison 1B

Do the elements that are not the central atom in a trigonal bipyramidal molecule always have to be the same? If not, what are some examples of molecules that are trigonal bipyramidal where the non-central atoms are different from one another?

Frenz Cabison 1B

How do dipole moments depend on molecular shape and bond polarity?

Frenz Cabison 1B

There's this one question on Test #3 where it asked about the uncertainty in velocity and the given info was the radius of the atom? When solving a Heisenberg problem, does the position have to be the diameter of the atom?

Frenz Cabison 1B

Hi! So I was looking at the sample problem from the book and the problem is: Estimate the minimum uncertainty in the position of a marble mass 1.0 g given that its speed is known to within plus/minus 1.0 mms^-1. On the "solve" part of the problem, it says to first convert mass and speed in...

Frenz Cabison 1B

How do we know which atom would be the central atom in a polyatomic molecule?

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What is the difference between resonance structures and isomers?

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How and why does light affect an electron's momentum and position?

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What does DeBroglie equation suggest? Does it just basically suggest that any particle with momentum has wavelike properties with wavelength?

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Aside from diffraction, what is another evidence that shows that electromagnetic radiation behaves like waves?

Frenz Cabison 1B

For what type of problems should I use each formula?
c = λ ν
E = h ν
E_k= 1/2 m_ev^2
E_k=hv- phi

Frenz Cabison 1B

When a problem says that Molecule A reacts with Element B in the presence of C, we don't have to write/include C in the equation right? For instance, in problem H7, the problem is: Write a balanced equation for [...] the reaction of ammonia gas with oxygen gas at high temperatures in the presence of...

Frenz Cabison 1B

There's this one textbook question that goes: It appears that balancing the chemical equation Cu + SO2 ---> CuO + S would be simple if we could just add another O atom to the product side: Cu+ SO2 ---> CuO+S+O. (a) Why is that balancing procedure not allowed? Is this not allowed because by doing so,...

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