CHEMISTRY COMMUNITY

Snigdha Uppu 1G

We never had to use the formula to do any calculations. if anything this would be a conceptual question,

Snigdha Uppu 1G

All the resonance structures should have the same charge because the only thing that is changing is the placement of the bonds.

Snigdha Uppu 1G

We would calculate it regularly because the second dissociation does not cause a large enough change in the pH for there to be a need to consider it.

Snigdha Uppu 1G

The acid molecule will react with water to produce H30+ and a conjugate base which can reaccept the proton.

Snigdha Uppu 1G

Lewis acids are molecules that are often positively charged that would bond to an atom with a lone pair such as H+.

Snigdha Uppu 1G

No we will not be tested on anything related to enthalpy.

Snigdha Uppu 1G

For strong acids like HCl you would assume full dissociation and so you would just take the negative log of the molarity given because that is how many H30+ ions will be produced as well.

Snigdha Uppu 1G

NH3 is a molecule that is amphoteric so it can act as a base or acid. Therefore, you can not assume anything.

Snigdha Uppu 1G

VSEPR provides a 3D model for a molecule based on the regions of electron density.

Snigdha Uppu 1G

You determine VSEPR based on the regions of electron density, and lone pairs attached to the central atom are considered another region of electron density.

Snigdha Uppu 1G

I believe the test will be handed back in discussion this week with your grade on it.

Snigdha Uppu 1G

A molecule is bent rather than linear because when a lone pair has more repulsion than that of another atom, so even though the other two atoms in the bent shape are closer together, this is still a more optimal shape.

Snigdha Uppu 1G

Sigma bonds allow for rotation while pi bonds do not, so the pi bonds would break only.

Snigdha Uppu 1G

Lone pairs have the highest repulsion, so even if the attached atoms are closer together when there is a lone pair, the molecule is more stable.

Snigdha Uppu 1G

If a bond broke, the melting point would decrease because that means less energy is required to break the total bonds in the molecule.

Snigdha Uppu 1G

The lone pairs have the highest repulsion, so the molecule is more stable if the atoms are further from the lone pairs because repulsion increases potential energy rapidly after a certain point.

Snigdha Uppu 1G

Yes we need to know the bond angles based on the molecular shape.

Snigdha Uppu 1G

The electron arrangement of H20 would be tetrahedral, but the molecular shape would be bent/angular.

Snigdha Uppu 1G

As previously stated, I would know the general trends of polarizability and polarizing power.

Snigdha Uppu 1G

You would not draw an expanded octet for a single atom. For a molecule, you would show an expanded octet by surpassing the octet rule such as an atom having 5 covalent bonds.

Snigdha Uppu 1G

Yes, because all molecules have electrons and these electrons can congregate by chance.

Snigdha Uppu 1G

Electronegativity and electron affinity increase towards the upper right.

Snigdha Uppu 1G

Atomic radius increases in the opposite direction from electronegativity.

Snigdha Uppu 1G

it is always plus or minus 1/2 and you cannot find the spin orientation, rather you essentially assign it yourself.

Snigdha Uppu 1G

There is no way to calculate or find the fourth quantum number. As long as two electrons in the same orbital do not have the same spin you are good.

Snigdha Uppu 1G

That information has nothing to do with the calculations because they give you the actual mass of the baseball.

Snigdha Uppu 1G

when you work with the equation, you use meters, but often you convert the final answer into nanometers because it is more visually appealing this way.

Snigdha Uppu 1G

basically you use the equation Ek = work + 1/2xmassxvelocity^2 and plug in the answer from part b as the value for the work function. Then you should get around 8.8x10^-9 m which you convert to nm.

Snigdha Uppu 1G

A lone pair is just the pair of electrons not used in the chemical bond, which is why they are lonely.

Snigdha Uppu 1G

Double bond placement does not need to be in a specific spot as long as the octet rule is fulfilled for all the atoms.

Snigdha Uppu 1G

Resonance means that a molecule can have a certain bond in multiple different areas while still being the same molecule. Lewis structures can only show one of these formations at a time.

Snigdha Uppu 1G

Atoms are the most stable with a full valence shell, and as you stated, the s and p orbitals can hold a total of 8 electrons, so the octet being filled is the goal.

Snigdha Uppu 1G

Water molecules use both Hydrogen atoms to form a hydrogen bond and not both to form one bond.

Snigdha Uppu 1G

i think attending lecture and taking good notes is a good way to study. After, review the textbook and consolidate the information into a more cohesive "cheat sheet" in order to highlight the specific topics.

Snigdha Uppu 1G

I think we should know the experiments in order to be able to understand the concepts behind the formulas.

Snigdha Uppu 1G

the extent of change refers to the wave's slope, which correlates directly with frequency.

Snigdha Uppu 1G

I agree I would just memorize which series goes with which level and the types of wavelengths that are associated with them. I would also know the range of each wave type.

Snigdha Uppu 1G

You basically use the formula wavelength=speed of light x frequency in order to find the frequency and wavelength as needed. To find the energy of the photon use the formula E=Planck's constant x frequency. Based on the wavelength, you can determine what the activity is.

Snigdha Uppu 1G

Photons act as a wave but on a much smaller scale act as individual entities.

Snigdha Uppu 1G

intensity is the number of photons emitted and frequency is the number of waves during a certain period

Snigdha Uppu 1G

wavelength and frequency are inversely related so when wavelength increases, frequency decreases, which means there is less intensity coming from the wave, so less energy.

Snigdha Uppu 1G

What is the relationship between wavelength, frequency and amplitude?

Snigdha Uppu 1G

I am not sure but so far we have only learned how to complete these problems using the equation derived from the experiment that used hydrogen atoms.

Snigdha Uppu 1G

It appears that balancing the chemical equation Cu 1 SO 2 S
CuO 1 S would be simple if we could just add another O atom to the
product side: Cu 1 SO 2 S CuO 1 S 1 O. (a) Why is that balancing
procedure not allowed? (b) Balance the equation correctly.

I am confused about part a.

Snigdha Uppu 1G

Practitioners of the branch of alternative medicine known as homeopathy claim that very dilute solutions of substances can have an effect. Is the claim plausible? To explore this question, suppose that you prepare a solution of a supposedly active substance, X, with a molar concentration of 0.10 mol...

Snigdha Uppu 1G

I believe that we should know the conversions as it will help with the efficiency of our test taking.

Snigdha Uppu 1G

A medical researcher investigating the properties of intravenous solutions prepared a solution containing 0.278 m C6H12O6 (glucose). What volume of solution should the researcher use to provide 4.50 mmol C6H12O6? I'm not sure whether the answer is 0.016 or 0.02. How do we know how many sig figs to r...

Snigdha Uppu 1G

Thank you for answering my question

Snigdha Uppu 1G

Which sample in each of the following pairs contains the
greater number of moles of atoms? (a) 75 g of indium or 80 g of
tellurium; (b) 15.0 g of P or 15.0 g of S; (c) 7.36 3 10 27 atoms of
Ru or 7.36 3 10 27 atoms of Fe.

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