CHEMISTRY COMMUNITY

Jedrick Zablan 3L

What dentate is dien, nitrite and carbonate-?

Jedrick Zablan 3L

Lyndon, I want to see the video you were trying to show during the review. Pls post it king.

Jedrick Zablan 3L

How do we know if something can form a chelating complex like in 9C7?

Jedrick Zablan 3L

Hello! What exactly are pKa and Ka and what are they used? Thanks.

Jedrick Zablan 3L

Hello! Can anyone list the strong acids and bases we had to memorize please? Thanks!

Jedrick Zablan 3L

Hello! Can anyone help me with E and F on 6D11? How do I write the chemical equation for those? Thanks! Decide whether an aqueous solution of each of the follow- ing salts has a pH equal to, greater than, or less than 7. If pH . 7 or pH , 7, write a chemical equation to justify your answer. (a) NH4B...

Jedrick Zablan 3L

Do we have to follow sig figs for pH and pOH calculations?

Jedrick Zablan 3L

Hello! How do I get the molar concentration for this question? Thanks!

The molar concentration of HCl in hydrochloric acid is reduced to 12% of its initial value by dilution. What is the differ- ence in the pH values of the two solutions?

Jedrick Zablan 3L

Whats the difference between a conjugate acid and base?

Jedrick Zablan 3L

What was the naming order again. and what is a good way to memorize it?

Jedrick Zablan 3L

Hello! The textbook puts a big focus on the sp^3 hybrid orbital. Why is that? I just want to know why it is important

Jedrick Zablan 3L

Simple question but on the final do we write the Hybridization as dsp^3 and d^2sp^3 or sp^3d and sp^3d^2?

Jedrick Zablan 3L

Why do acids have a higher H30+ concentration and why do bases have a higher OH- concentration?

Jedrick Zablan 3L

Hello! How do we calculate the pH when the acid or base is weak?

Jedrick Zablan 3L

Why is cisplatin able to be used as an anticancer treatment, but transplatin isn't? How does their structures change their functions?

Jedrick Zablan 3L

Why can sigma bonds rotate but pi bonds can't?

Jedrick Zablan 3L

Why do organic acid tend to be weaker than inorganic acids? What is the difference in their structure?

Jedrick Zablan 3L

So is ionic an inter and intramolecular force?

Jedrick Zablan 3L

Thanks!

Jedrick Zablan 3L

If a structure is bent, do have to explicitly say that it is a ?bent trigonal planar and a bent tetrahedral" or can we just say "bent"?

Jedrick Zablan 3L

Hello! Why does Pz form a sigma bond while the other p orbitals form a pi bond?

Jedrick Zablan 3L

Hello! Can anyone help me by ordering the intermolecular forces from weakest to strongest.

Jedrick Zablan 3L

You could examine the amount of lone pairs would impact electron repulsion in turn impacting the shape.

Jedrick Zablan 3L

The presence of lone pairs and number of bonded atoms is the difference in the shapes. Octahedral has no lone pairs with 6 bonded atoms. Square Pyramidal has one lone pair with 5 bonded atoms. Square planar has two lone pairs with 4 bonded atoms. The single lone pair of Square Pyramidal creates a re...

Jedrick Zablan 3L

AX2E has a bond angle near 120 degrees while AX2E2 has a bond angle near 109.5 degrees.

Jedrick Zablan 3L

A T-Shape is created when there is one central atom with two lone pairs and three bonded atoms. The shape comes from the electron repulsion of the lone pairs. Some examples are ClF3 and BrF3.

Jedrick Zablan 3L

I think the key would be just memorizing the bond angles of each shape, or at least see the pattern of what shapes look like and how similar shapes have similar or same bond angles.

Jedrick Zablan 3L

For the test, do we need need to know t-shaped and see-saw? I saw it in the practice and the textbook, but it wasn't mentioned in Wednesday's lecture.

Jedrick Zablan 3L

They are typically not included in the trend since the electronegativity trend is used for bonding. Noble gases already have full valence shells, so they tend not to bond with other elements, resulting in there not being a need for their inclusion in the trend.

Jedrick Zablan 3L

Why is hydrogen bonding so important in parts of biology such as DNA structure?

Jedrick Zablan 3L

Are hydrogen bonds the strongest intermolecular force? If so why? Thanks.

Jedrick Zablan 3L

This is some quality content.

Jedrick Zablan 3L

Why are Nitrogen, Oxygen and Fluorine the main atoms in hydrogen bonding? Thanks.

Jedrick Zablan 3L

Why do more bonds lead to shorter bond lengths? Like why are double bonds shorter than single bonds?

Jedrick Zablan 3L

Do all molecules have London forces? If so why? Thanks.

Jedrick Zablan 3L

Hello! I just have a conceptual question about the equation. Why is Planck's constant divided by 4pi?

Jedrick Zablan 3L

How do we know which elements typically are exceptions to the octet rule? Do we have to memorize them or is there a specific trend or group in the periodic table?

Jedrick Zablan 3L

Can someone please tell me some exceptions to the Periodic Table trends?

Jedrick Zablan 3L

Yesterday, Lyndon showed an exception to the Ionization Energy trend where Nitrogen had more than Oxygen. Can someone please explain why?

Jedrick Zablan 3L

Hello! If two elements seem like they are the about the same distance from the top right of the periodic table, how do we determine which one is more electronegative?

Jedrick Zablan 3L

Hello! This is a really simple question, but how do you find the number of valence electrons for transition metals? Thanks. :)

Jedrick Zablan 3L

Is checking the formal charge the only way to make sure your lewis structure is correct? Or is there another method?

Jedrick Zablan 3L

For the test do you guys know if we have to write the whole electron configuration or can we just write the noble gas configuration? Thanks :)

Jedrick Zablan 3L

Why does atomic radius decrease from left to right and increase down the period. Thanks :)

Jedrick Zablan 3L

Hello! For the test do we need to know what shapes the bond make like squares or rings? If so, how do I determine what shape the molecule makes.

Jedrick Zablan 3L

Hello! Professor Lavelle was talking about specific elements like chromium that don't follow typical electron configuration. Can anyone tell me what are the other ones pls. :)

Jedrick Zablan 3L

For tests, do we have to show the p orbital as px, py and pz or can we just leave it as p?

Jedrick Zablan 3L

I am really stuck. Can anyone help me understand how to approach this problem? Thanks :) 1A.13 Use the Rydberg formula for atomic hydrogen to calculate the wavelength of radiation generated by the transition from n = 2 to n = 1. (b) What is the name given to the spectroscopic series to which this tr...

Jedrick Zablan 3L

Is there a source in the textbook or online where I can find the equations needed to complete questions in the quantum section?

Jedrick Zablan 3L

1 cycle * s^(-1)

Jedrick Zablan 3L

Hello can anyone explain to me why Joules in Planck's Constant is kg x m^2 x s? Thanks.

Jedrick Zablan 3L

Hello where do we find the mass of a proton and neutron?

Jedrick Zablan 3L

In 1A9 how do I figure out what type of radiation each event matches to thanks? 1A9. A college student recently had a busy day. Each of the stu- dent’s activities on that day (reading, getting a dental x-ray, mak- ing popcorn in a microwave oven, and acquiring a suntan) involved radiation from a dif...

Jedrick Zablan 3L

You would convert it like any other prefix for SI Units. So you would multiply by 10s if it is less than an angstrom and divide by 10s if it is more than an angstrom.

Jedrick Zablan 3L

Hello I need help on G5. How would I approach the problem? A student prepared a solution of sodium carbonate by adding 2.111 g of the solid to a 250.0-mL volumetric flask and adding water to the mark. Some of this solution was transferred to a buret. What volume of solution should the student transf...

Jedrick Zablan 3L

The actual yield must be given because it is based off the product measured in the experimental data. However, the theoretical yield will have to be found in some questions.

Jedrick Zablan 3L

Hello. I forgot the reasoning behind why light with shorter wavelengths results in more electron emissions. Can someone please help? :)

Jedrick Zablan 3L

You would approach both part a and b the same way you would approach others problems in the L section. 1)Divided by the molar mass of the molecule that is given (C57 H110 O6) 2)Multiply by (moles of the mole it is asking for divided by moles of the molecule that is given) 3)Multiply by the molar mas...

Jedrick Zablan 3L

Can someone help me with this question from the module pls? 5.00 g of KMnO4 is dissolved in a 150.00 mL flask of water. If 20.00 mL of this solution is removed and placed in a new 2nd 250.00 mL flask and filled with water, what is the concentration of the solution in the 2nd flask? Molar Masses: K (...

Jedrick Zablan 3L

Can someone explain to me why frequency is represented as "v" in the equation c = v ( lambda)?

Jedrick Zablan 3L

Using 100 grams makes it easier to convert from percentages to grams. For example, if the percentage is 48% then you can convert it to 48 grams since they are both out of 100. This helps you avoid extra steps and extra work to convert the percentages to masses. Hope this helps. :)

Jedrick Zablan 3L

Thank you guys for the help :)

Jedrick Zablan 3L

Hey I was wondering when we should round for sig figs during our calculations? Should we do it after each step or at the end of our calculation?

Jedrick Zablan 3L

Hey guys! Is the state of matter for the reactants and products significant for what we are doing right now in chemistry? Like will it impact balancing equations?

Jedrick Zablan 3L

I would include the state of matter because it helps show what is actually going on in the chemical reaction. Also, it is just good to get into the habit for later on in the course. :)

Jedrick Zablan 3L

Thank you Charlee!

Jedrick Zablan 3L

Why do the seven diatomic elements (Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Iodine, and Bromine) have to come in pairs? Why can they not stand alone in a chemical equation?

Jedrick Zablan 3L

Hey, I was just curious. What does Avogadro's number actually represent? Thank you guys. :)

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