CHEMISTRY COMMUNITY

Jessica Tejero 3L

Why is H2O a monodentate when it has 2 pairs of lone electrons?

Jessica Tejero 3L

^^^Thank you

Jessica Tejero 3L

This might be a dumb question but are polydenate ligands and bidenate ligands the same thing?

Jessica Tejero 3L

Yes getting as much studying done as possible is beneficial but remember to take breaks in between so you don't overwhelm yourself.

Jessica Tejero 3L

I believe the final is cumulative but i would focus more on the info after the midterm.

Jessica Tejero 3L

Can someone help

1B.9 A lamp rated at 32 W emits violet light of wavelength 420 nm. How many photons of violet light can the lamp generate in 2.0 s? How many moles of photons are emitted in that time interval?

Jessica Tejero 3L

Whats the easiest ways to tell whether a molecule is polar or non-polar?

Jessica Tejero 3L

Write the names of the ligands in the following order: neutral, negative, positive. If there are multiple ligands of the same charge type, they are named in alphabetical order.

Jessica Tejero 3L

An electron withdrawing group draws electrons away from a reaction center. When this center is an electron rich carbanion or an alkoxide anion, the presence of the electron-withdrawing substituent has a stabilizing effect. Electron withdrawing group are atoms or groups that draw electron density fro...

Jessica Tejero 3L

I think it will be everything from the fundamentals to post midterm topics. But I would mostly focus post midterm.

Jessica Tejero 3L

https://www.google.com/url?sa=t&rct=j&q ... KdxVSxmH-f

This might help

Jessica Tejero 3L

The oxidation number of an atom is zero in a neutral substance that contains atoms of only one element. Atoms in O2, O3, P4, S8, and aluminum metal all have an oxidation number of 0. The oxidation number of simple ions is equal to the charge on the ion. The oxidation number of sodium in the Na+ ion ...

Jessica Tejero 3L

Some examples would be Ba(OH)2, PO4^3-, SO4^2-

Jessica Tejero 3L

An atom or group that draws electron density from neighboring atoms towards itself, usually by resonance or inductive effects

Jessica Tejero 3L

For number 21 what is the oxidation state of iron?

Jessica Tejero 3L

Hi, could someone help me approach this? 6B.5 Calculate the pH and pOH of each of the following aqueous solutions of a strong acid or base: (a) 0.0146 m HNO3(aq); (b) 0.11 m HCl(aq); (c) 0.0092 m Ba(OH)2(aq); (d) 2.00 mL of 0.175 m KOH(aq) after dilution to 0.500 L; (e) 13.6 mg of NaOH dissolved in ...

Jessica Tejero 3L

Could someone explain amphoteric

6A.17 State whether the following oxides are acidic, basic, or
amphoteric: (a) BaO; (b) SO3; (c) As2O3; (d) Bi2O3.

Jessica Tejero 3L

I doubt that their will be a curve especially since a C in the class is 50%.

Jessica Tejero 3L

Strong acids usually have very high electronegativity

Jessica Tejero 3L

Usually the stronger acid is the element with the higher electronegativity.

Jessica Tejero 3L

The value depends on the relative sizes of the central atom and ligands and by the charge from the electronic configuration of an ion. The coordination number of an atom in a molecule or polyatomic ion is found by counting the number of atoms bound to it

Jessica Tejero 3L

I think they just count them after week 10 to make sure you've done the posts

Jessica Tejero 3L

The dissociation constant Ka is usually written as a quotient of the equilibrium concentrations (in mol/L), denoted by [HA], [A−] and [H3O+]. Relationship between Ka, pKa and acid strength: The smaller the value of Ka, the larger the value of pKa, the weaker the acid.

Jessica Tejero 3L

Will Lavelle be giving a practice final in preparation for Sunday?

Jessica Tejero 3L

yes a 50% is a C which is passing.

Jessica Tejero 3L

Lavelle will probably send an email to inform everyone which room they will be taking the test in.

Jessica Tejero 3L

Is test 2 only covering VSEPR models?

Jessica Tejero 3L

I feel like the step up programs have helped a lot and just reviewing practice problems would be the best.

Jessica Tejero 3L

Draw the Lewis structure and predict whether each of the
following molecules is polar or nonpolar: (a) H2Se; (b) AsF5;
(c) SiO2; (d) NF3.

Any easy rules to remember to find out if a molecule is polar or nonpolar?

Jessica Tejero 3L

Personally I like to meditate and go over breathing exercises to get myself focused on something else

Jessica Tejero 3L

I believe that whatever's been reviewed during lecture and section are the most relevant shapes to know. So if it hasn't been introduced in class then I wouldn't worry too much about it.

Jessica Tejero 3L

Hi could anyone help with approaching this problem
Predict whether each of the following molecules is likely to
be polar or nonpolar: (a) CH3SH (methanethiol, found in breath
odor and skunks); (b) CH3NH2 (methylamine, a drug precursor);
(c) CH3OCH3 (dimethyl ether, used as an aerosol propellant).

Jessica Tejero 3L

if you're not very sure on whether you can correctly visualize the molecule in your head then its safe to draw the lewis structure for an accurate VSEPR shape

Jessica Tejero 3L

Double bonds involving carbon are stronger than single bonds and are also shorter. Double and triple covalent bonds are stronger than single covalent bonds.

Jessica Tejero 3L

Midterms are just the prior info given before the test. I believe the finals are cumulative.

Jessica Tejero 3L

Resonance is a mental exercise and method within the Valence Bond Theory of bonding that describes the delocalization of electrons within molecules.

Jessica Tejero 3L

The increased distance weakens the nuclear attraction to the outer-most electron, and is easier to remove (requires less energy).

Jessica Tejero 3L

Yes it could accommodate more than eight valence electrons by using one or more d orbitals

Jessica Tejero 3L

Can someone explain part b to me 1E.5 Which of the following statements are true for many-electron atoms? If false, explain why. (a) The effective nuclear charge Zeffe is independent of the number of electrons present in an atom. (b) Electrons in an s-orbital are more effective than those in other o...

Jessica Tejero 3L

Hi can someone assist me on this

1E.25 Give the notation for the valence-shell configuration
(including the outermost d-electrons) of (a) the alkali metals;
(b) Group 15 elements; (c) Group 5 transition metals; (d) the
“coinage” metals (Cu, Ag, Au).

Jessica Tejero 3L

When writing an electron configuration how does the Hund's rule come in? Is it only when more than one orbital in a subshell is available? Or is it when their spin numbers are paired?

Jessica Tejero 3L

Hi could someone walk me through this please. 1A.11 In the spectrum of atomic hydrogen, several lines are generally classified together as belonging to a series (for example, Balmer series or Lyman series, as shown in Fig. 1A.10). What is common to the lines within a series that makes grouping them ...

Jessica Tejero 3L

Something that has been immensely helpful to me is the AAP program. Enrolling in a plf session two times a week has helped me review a lot in addition to the step up program.

Jessica Tejero 3L

Correction 2 x 10^-11 m

Jessica Tejero 3L

Use the formula (h/4pi x delta p) and plug in all the values after solving for delta x.

I think the answer is Delta x >= 2 x 10^11 m

Jessica Tejero 3L

Also if their is massless particles like photons, I believe we can use c=λν or E=hν. And I think the formula c=λν can be used for objects with a mass you just have to replace the speed of light (c), with velocity

Jessica Tejero 3L

I think it's because all electromagnetic radiation, regardless of wavelength or frequency, travels at the speed of light.

Jessica Tejero 3L

How do I know how to assign quantum numbers to electrons?

Jessica Tejero 3L

The size of the atom represents the uncertainty in position. The radius of the atom represents 1/2 of the uncertainty of the position of the electron, the diameter equaling the entire uncertainty. Use this and the mass of an electron and the constant h/4pi to calculate delta-v, or the uncertainty in...

Jessica Tejero 3L

The way I've learned it is to have the balanced chemical equation for the chemical reaction and convert all given information into moles. Then use stoichiometry for each individual reactant to find the mass of product produced.The reactant that has a lesser amount of product is the limiting reagent.

Jessica Tejero 3L

To find the formula units of the compound I believe you take the amount of sample and divide it by its molar mass in order to get the moles of the sample. To find the formula unit from the compound use Avogadro's constant
= (5.15g/(246.48 g/mol))(6.022x10^23)

Jessica Tejero 3L

I think the most important info to study for Test 1 would be the Review and fundamentals not so much the sig fig aspect

https://lavelle.chem.ucla.edu/wp-conten ... ciples.pdf

Jessica Tejero 3L

Hi so I'm a little overwhelmed by this question and would like some advice on how to approach H.7 Write a balanced chemical equation for each of the following reactions. (a) Calcium metal reacts with water to produce hydrogen gas and aqueous calcium hydroxide. (b) The reaction of solid sodium oxide,...

Jessica Tejero 3L

I think its because wavelength of light comes from photons with a specific energy released by electrons making transitions between specific energy levels of the atom.When an electron in an atom goes from a higher energy level to a lower energy level, it gives a photon to carry off the extra energy. ...

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