CHEMISTRY COMMUNITY

Drake Choi_1I

A t-shape molecule has 3 atoms attached to it with 2 lone pairs

Drake Choi_1I

It is only on the central atom

Drake Choi_1I

How can we tell that acetic acid is electron donating?

Drake Choi_1I

Are we expected to know the K values from memory?

Drake Choi_1I

The answer to part a is CH3CO2K, potassium acetate. part b is (NH4)3P04, ammonium phosphate. part c is Ca(BrO2)2, calcium bromite. Part d is Na2S, sodium sulfide.

Drake Choi_1I

I have a shortcut for H O N C. If Hydrogen has 1 bond, oxygen 2, nitrogen 3, carbon 4 then the formal charges will be 0.

Drake Choi_1I

On test 2, we were asked to label sigma and pi bonds. I only knew that sigma bonds were for single bonds and double bonds had pi bonds. Can someone explain how we were supposed to label them?

Drake Choi_1I

What is one biological example of coordination compounds?

Drake Choi_1I

I believe Dr. Lavelle said that dirty coal has a higher sulfur content than clean coal

Drake Choi_1I

Malik Oda 1F wrote:Working out really helps and being overconfident to keep a cool mind

Yes! Working out also really helps me with stress. :) Keep your mind and body healthy guys!

Drake Choi_1I

Does anyone know when Test 2 will be passed back?

Drake Choi_1I

The correct answer is 3 but I also got it incorrect so cannot help on the why part. Hopefully someone else can help us both :)

Drake Choi_1I

Could someone also explain what a chelate is exactly?

Drake Choi_1I

Drake Choi_1I

I think he said he posted a list on his website. I'm not sure though, it might've been for something else.

Drake Choi_1I

Yes, I definitely think we will need to know the prefixes and other rules

Drake Choi_1I

Although the answer for part C is "slightly less than 109.5", will we get credit for answering "109.5?"

Drake Choi_1I

Thank you so much! I didn't know what to study because I couldn't remember what was on the midterm or not. :)

Drake Choi_1I

I think we will have to memorize the basic ones.

Drake Choi_1I

Drake Choi_1I

Ok I'll see if my schedule lines up at all!

Drake Choi_1I

What days are you planning to study?

Drake Choi_1I

Sorry I read my work incorrectly, I don't need an answer

Drake Choi_1I

When calculating the molar mass of 2 moles $N_{2}$ , I calculated the 14.0067 x 4 because I thought it was equivalent to 4 nitrogen atoms. Can someone explain why I'm wrong please? I know now that the molar mass should have been just 14.0067 x 2.

Drake Choi_1I

What causes electrons to be distorted?

Drake Choi_1I

I remember Balmer is n=2 because it sounds like palms and you have 2 palms :)

Drake Choi_1I

Doing all the homework definitely helped me prepare for the midterm.

Drake Choi_1I

Ionic bonds are stronger because of the contrast in electronegativity.

Drake Choi_1I

I might be down

Drake Choi_1I

Also, triple bonds are shorter and stronger than double bonds :)

Drake Choi_1I

Covalent character is a measure of how little a bond is polarized.

Drake Choi_1I

Debora Fernandez Clemente_ 4H wrote:When determining the most stable structure do you choose the Lewis structure with the least formal charges on each atom?

Yes that is correct. Hope this helps! :)

Drake Choi_1I

Is covalent character the tendency of an atom to attract electrons to itself?

Drake Choi_1I

What exactly are resonance structures? All I know is that they are brought up when delocalization occurs.

Drake Choi_1I

Removing the first electron results in a positive charge. This charge has more attraction to the electron, thus making removing the second electron more difficult.

Drake Choi_1I

The atomic radius generally increases from right to left across a group. It also normally increases top to bottom within a group. I use the periodic table and the inverse relationship between atomic radius and ionization energy to help with ionization energy problems.

Drake Choi_1I

Watching youtube videos from Crash Course helped me a lot in high school when reviewing concepts. When I was looking for more specific review, I would search for certain topics on Khan academy.

Drake Choi_1I

The acronym HONC helps me with bonds. Hydrogen (H) prefers 1 bond, Oxygen (O) prefers 2 bonds, Nitrogen (N) prefers 3 bonds, and Carbon (C) prefers 4 bonds.

Drake Choi_1I

A helpful way to remember is to see the "t" in cation as a plus!

Drake Choi_1I

Thank you for the clarification! :)

Drake Choi_1I

Does anyone know if there will be mutiple choice? Or will it solely be problems?

Drake Choi_1I

Is there going to be a curve for the midterm? Or is grade based on raw score?

Drake Choi_1I

I also find that attempting to do the homework and then looking at the book when you are stuck has worked better for me than simply reading the book before doing homework problems.

Drake Choi_1I

When drawing spin, is there a reason why only half of the arrow point is used?

Drake Choi_1I

Thank you Maeve! This helped a lot.

Drake Choi_1I

Part A asks, "What is the wavelength of the ejected electron?" The velocity of the electron that is emitted from a metallic surface by a photon is 3.6 x 10^3 km.s^-1. Part B states no electrons are emitted from the surface of the metal until the frequency of the radiation reaches 2.50x10^1...

Drake Choi_1I

Thank you! This helped a lot :)

Drake Choi_1I

When converting from photons to moles, would it be 6.022 x 10^23 photons to 1 mole?

Drake Choi_1I

I still don't know what to post to chemistry community. Is it a good idea to ask about homework questions or concepts? I feel like a lot of the questions I would ask are already answered.

Drake Choi_1I

Is there anyone else that hasn't done chemistry since sophomore year? I did not even do AP, so my knowledge of chemistry in very minimal.

Drake Choi_1I

I remember learning in physics something about mediums and light. I know that a vacuum is where light can travel fastest. What is the next fastest medium?

Drake Choi_1I

Is it effective to do the whole homework list? Or should I focus on doing a few problems from each section?

Drake Choi_1I

Will the grading on test 1 be similar to AP style grading? Certain lines of work that demonstrate what you know can get you partial points?

Drake Choi_1I

Is it a good idea to review online modules before lectures so that I can be familiar with what is going to be lectured on? Or should I review after I have had the lecture? Thank you :)

Drake Choi_1I

How can I make sure that I am getting a variety of homework problems done without doing all of them? I want to do problems that will help prepare me for the test without doing too many and frying my brain.

Drake Choi_1I

When studying, is there a schedule anyone here has for breaks? I cannot focus as long as I used to lol and can't figure how long I should study for, when to take breaks, and for how long. Does anyone have tips on how to manage time better while studying?

Drake Choi_1I

Can someone please explain the sig fig rules regarding addition and subtraction as well as multiplication and division? I forget which one is about having the same amount of decimal places and which needs the same amount of sig figs. Thank you!

Drake Choi_1I

Does anyone know if we will have to memorize the basic polyatomic ions for tests?

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