CHEMISTRY COMMUNITY

Doreen Liu 4D

Hydrofluoric acid is a weak acid. Which of the following images best represents a solution of hydrofluoric acid? The blue spheres represent fluorine and the white spheres, hydrogen.

The answer is the one without any bonds - why is that true?

Doreen Liu 4D

The oxides of nonmetallic elements are called acidic oxides because they form acidic solutions in water. Write the balanced chemical equations for the reaction of 1 mol of formula units of each acidic oxide with 1 mol of water molecules to form an oxo- acid and name the acid formed: (a) CO2; (b) SO3.

Doreen Liu 4D

Draw the Lewis structure of boric acid, B(OH)3. (a) Is resonance important for its description? (b) The proton transfer equilibrium for boric acid is given in a footnote to Table 6C.1. In that reaction does boric acid act as a Lewis acid, a Lewis base, or neither? Justify your answer by using Lewis ...

Doreen Liu 4D

Why is CO3^2- a tridentate ligand while Oxalate (C2O4^2-) is a bidentate not a tetradentate ligand?

Doreen Liu 4D

Why is water always a monodentate ligand if it has two lone pairs on the Oxygen atom?

Doreen Liu 4D

The two molarity formula that would be most helpful is: M=n/L and M1V1=M2V2, where n= number of moles, L = liter, M=molarity

Doreen Liu 4D

You should calculate/round to the fewest number of sig figs given in a problem.

Doreen Liu 4D

Biological examples would be the body's natural response while industrial examples could be pharmaceuticals.

Doreen Liu 4D

Its structure helps it to bind to DNA molecules and prevent replication.

Doreen Liu 4D

In a coordination compound, the ligands are named before the metal. Write down the names of the ligands in the following order: neutral, negative, positive.

Doreen Liu 4D

The angle would be <90.

Doreen Liu 4D

How do we draw the lewis structure for CH3CHCHCN?

Doreen Liu 4D

What would be the Lewis Structure of C5H5N? Would we have to know how to draw that on the test?

Doreen Liu 4D

Can someone explain how to determine the shape and angle of the molecule C2H4?

Doreen Liu 4D

For a see-saw shape (AX4E), would the angles be <90?

Doreen Liu 4D

Can someone help me with the lewis structure of the molecule H2C double bonded to CHCHO?

Doreen Liu 4D

The dipole moment for 1 would be the largest because the C-Cl bond vectors are pointing most nearly in the same direction in 1 whereas in 2 the C-Cl vectors point more away from each other, giving a larger cancellation of dipole.

Doreen Liu 4D

It describes the wave function or state function of a quantum-mechanical system

Doreen Liu 4D

The magnetic quantum numbers is the -l to l values. If l=1, then ml would be -1, 0, and 1.

Doreen Liu 4D

The unit is most likely in meters.

Doreen Liu 4D

Do CH3Cl, CH2Cl2, and CHCl3 all have dipole moments because of the lone pairs on the chlorine?

Doreen Liu 4D

A double and triple bond is stronger but shorter than a single bond. The stronger the bond, the harder it is to break - so it would take more energy to break a double/triple bond than a single bond.

Doreen Liu 4D

Which has a higher boiling point? CHI3 or CHF3?

Doreen Liu 4D

For some elements, expanded octets are not allowed (i.e. some period 2 elements), so just be careful when you're drawing those.

Doreen Liu 4D

The p and d orbitals are not symmetrical and s orbital is symmetrical.

Doreen Liu 4D

It is good to know the experiments because they will provide an understanding of what you are actually solving for.

Doreen Liu 4D

I think we just have to know that the Lyman series corresponds to UV while the Balmer series corresponds to the visible light.

Doreen Liu 4D

What are some of the factors affecting the energy of an electron in a many-electron atom?

Doreen Liu 4D

Can someone explain the difference between Atomic and Molecular spectroscopies?

Doreen Liu 4D

Some Lewis Structures have multiple bonds (double/triple bonds) in different equivalent locations. You have resonance when you can place multiple bonds in different places (i.e. the placement of the double bonds)

Doreen Liu 4D

Yes because the formal charges have to add/subtract to -1.

Doreen Liu 4D

The formal charge equation is FC=V-(L+S/2) where V=valence electrons and L=lone pairs. What is the "S" in the equation?

Doreen Liu 4D

Can someone explain what the process is when trying to draw a complex Lewis Structure? For example, the lewis structure for section 2B question 11 part c - glycine.

Doreen Liu 4D

When drawing the lewis structure of Potassium Phosphide, do we connect the K+ together or do we separate them around the P^3- structure?

Doreen Liu 4D

I know that the spin quantum (ms) describes the angular momentum of an electron, but I am confused on when to use that number +1/2 and -1/2 or is it only for drawing the arrows?

Doreen Liu 4D

The answer should be D. None of the other ones is a correct representation of the photoelectric effect.

Doreen Liu 4D

In the solutions manual, often the value 2.99x10^8 is used, so I think for accuracy purposes, use the 2.99 value on the test.

Doreen Liu 4D

Destructive interference can only happen when the trough of one wave meets the peak of another wave. In other words, if they are the "opposite," then they will cancel out.

Doreen Liu 4D

No, photons do not have a mass. They do have energy and momentum, but no mass.

Doreen Liu 4D

A baseball must weigh between 5 and 5.25 ounces. What is the wavelength of a 5.15 ounce ball thrown at 92mph.
Can someone help me with this problem? Also, would I have to turn both the ounces and the miles/hour into SI units before I can start solving it?

Doreen Liu 4D

The magnetic quantum number represents the number of orbitals in each subshell (-l to l)

Doreen Liu 4D

What is the minimum uncertainty in the speed of an electron confined within an atom diameter of 3.50 pm?
Is the delta x in the equation the diameter? If so, do I need to change it to meters before I can use the diameter?

Doreen Liu 4D

The velocity of an electron from a metal surface by a photon is 3.6 x 10^3 km/s. What is the wavelength of ejected e-?
For this question, since wavelength can be calculated by both h/mv and hc/E, how do I determine which one to use?

Doreen Liu 4D

When the uncertainty is some value plus minus another value (e.g. 2.35±0.1 pm), is the uncertainty value 0.1 or is the value altogether the uncertainty?

Doreen Liu 4D

To calculate the energy of one mole of photon, which equation do I use? Can I just multiply the energy of the photon by Avogadro's number?

Doreen Liu 4D

The diagram is not a necessity, but it could be useful to visualize what you are working with. You can solve the problem regardless.

Doreen Liu 4D

The work function is in the energy of photons equation. It is the threshold energy which is the minimum energy needed to free electrons from a certain metal.

Doreen Liu 4D

I believe the spectrum is something you should know. Just remember that the more dangerous waves like Gamma rays and x-rays are on the high frequency, low wavelength end of the spectrum, while waves like microwaves and radio waves are on the low frequency, high wavelength end of the spectrum.

Doreen Liu 4D

When the experiment changed the intensity of the light on the metal, does that mean the frequency increased? How is intensity measured?

Doreen Liu 4D

You should always answer with the unit that the question is asking. If it began with moles and asked how many moles are in the end, then keep/convert answer into moles, but if it began with grams and asked for the mass, then keep/convert answer into mass.

Doreen Liu 4D

The empirical formula shows clearly of all the elements in a certain compound as well as the ratio. However, in Chemistry, the molecular formula is more commonly used rather than empirical formula.

Doreen Liu 4D

Can someone help me with this limiting reactant problem? "Find limiting reagent if 21.4g NH3 is reacted with 42.5g of O2." How do I find the limiting reagent if the ratio is not 1:2?

Doreen Liu 4D

You can write an answer in powers of 10 when it can be easily understood and for sig figs purposes.

Doreen Liu 4D

When you calculate the molarity, you should convert it to the SI unit L before you calculate so you don't forget to do it at the end.

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