CHEMISTRY COMMUNITY

Michelle Chan 1J

It is more effective than transplatin because it binds twice instead of once making it more effective.

Michelle Chan 1J

I thought it was pretty difficult compared to the questions we practiced :(.

Michelle Chan 1J

I think you only need to write 2 if the questions asks for it specifically.

Michelle Chan 1J

-ido is the most updated IUPAC naming, but either works.

Michelle Chan 1J

EDTA prevents enzymatic activity, is hexadentate, and removes metals from solutions.

Michelle Chan 1J

I think a single lone pair can be counted because in lecture, he used the example NH3 with only one lone pair.

Michelle Chan 1J

A ligand chelates when when it forms a ring including the central atom. It must be polydentate.

Michelle Chan 1J

A strong base would have a higher pH because it accepts more protons.

Michelle Chan 1J

I would know the examples that he explained during lecture, such as hemoglobin.

Michelle Chan 1J

Add -ate to the end of the metal name if the complex is negative

Michelle Chan 1J

Same concept, just named after different people/theories.

Michelle Chan 1J

For the post above, a bronsted acid is a proton donor and a lewis acid in an e- acceptor.

Michelle Chan 1J

Yes, that is correct!

Michelle Chan 1J

Shapes, polarity, and sigma/pi bonds will be on the test. So up to Monday's first slide!

Michelle Chan 1J

I don't think the midterm grades itself are curved. Only the class at the end.

Michelle Chan 1J

lone pair, bond, or radical

Michelle Chan 1J

A side question: is there a way to tell just by looking because some people derive it really quickly in their head. Just wondering.

Michelle Chan 1J

In class he said everything up to sigma and pi bonds (which we will learn on Monday), so IMF, shapes, and bonds.

Michelle Chan 1J

I don't think we need to know exact values, but we should know generally which atom is the most electronegative in relation to others in the molecule.

Michelle Chan 1J

I am not completely sure, but yes they are only counted as one. Maybe because e- are so light that it is insignificant.

Michelle Chan 1J

If you draw out the three orbitals, N is more stable because they are each filled with one e-, thus O would want to lose one to become more stable.

Michelle Chan 1J

I also struggled with this. I was thinking it has something to do with Avogadro's number? I'm not completely sure.

Michelle Chan 1J

How exactly does this work? So is the class curved in the end?

Michelle Chan 1J

I agree with the answer above, but shorter wavelengths have more energy so I'm assuming by "maximum wavelength" they mean the longest and least energy wavelength it would take to eject an electron.

Michelle Chan 1J

Not for now, but we probably will have to take it into account when we learn about different shapes later!

Michelle Chan 1J

The distance between the nucleus and the electrons increase, therefore decreasing the attraction for e-.

Michelle Chan 1J

The atom would lose its unpaired electrons to become an ion or gain e- to fill its shell. For example, H would lose 1 e- to become H+1 and F would gain an e- to fill its shell to come F-1.

Michelle Chan 1J

I am not entirely sure in which context you are asking, but triple > double > single bonds in decreasing order.

Michelle Chan 1J

For example, CH3 is a radical because there is an unpaired electron. Food supplements, such as vitamins, can react with radicals before they cause damage.

Michelle Chan 1J

Electronegativity is how "greedy" atoms are for e-. So atoms with 7 valence e- are more electronegative than atoms with 8e-. Electron affinity is the amount of energy released when an electron is added to a neutral atom.

Michelle Chan 1J

I like the compile my notes into one big study guide on google docs and also do (redo) practice problems from the homework.

Michelle Chan 1J

I think we can because we were finishing up the chapter this week in lecture.

Michelle Chan 1J

I am a little confused on how to figure out the number of unpaired electrons for question 1E.23. For example, how many unpaired e- would be in Ga or Ge? Can someone explain? Thanks!

Michelle Chan 1J

Usually shorter bonds (in distance, Angstroms) are stronger than longer bonds.

Michelle Chan 1J

I am not completely sure, but in the examples in class, they were given. For more commonly known compounds, we should be able to derive the chemical formula with the name.

Michelle Chan 1J

I wrote down in my notes that this experiment discovered the electron spin. Silver atoms with one unpair e- split into two beam. Thus, e- can spin up or down, so we use quantum numbers ms=+1/2 and ms=-1/2.

Michelle Chan 1J

I think x,y, and z correlate to the planes. He derived x by looking at the table from the slides.

Michelle Chan 1J

Since the number of protons is increasing as you go right on the periodic table, the the effective nuclear charge increases and the nuclear pull is greater, thus resulting in a smaller radii.

Michelle Chan 1J

I think you are correct. Light is a wave because it demonstrates wave properties, but when considered as packets of photons, it own demonstrate particle-like properties. This is called wave-particle duality. It depends on the circumstances and what effects you're studying.

Michelle Chan 1J

I kind of have an idea of this, but can someone clarify how to determine the if an e- is in the X Y or Z plane? Thanks!

Michelle Chan 1J

You would have to use stoichiometry. Set up a dimensional analysis to find the grams of hydrazine given 35g of ammonia. The solution to your dimensional analysis is the expected yield. Divide 25.2g (actual) by your solution (expected), then multiply by 100 to get your percent yield.

Michelle Chan 1J

I agree with the person above^. Also, if you ever forget, it's listed on top of the formula sheet we get during the test.

Michelle Chan 1J

The De Broglie Equation is used for any particle with momentum and has wavelike properties with a wavelength. Remember to not use EM equations for electrons!

Michelle Chan 1J

If the molar mass of the empirical formula is the same as the one given in the question, is the molecular formula the same as the empirical? Or is there no molecular formula?

Michelle Chan 1J

For F9, I understand all the steps until you multiply to get the molecular formula. How do you know to multiply 3? Do you just keep multiplying until you get whole coefficients?

Michelle Chan 1J

Blue light has more energy because it has a shorter wavelength. Blue light has a higher frequency than red light.

Michelle Chan 1J

I think that's just how they naturally occur. For example, you won't find just one singular oxygen atom, thus we make them diatomic in chemical equations.

Michelle Chan 1J

The roman numeral in the parenthesis represent the charge since those metals have various charges. Since 02 is -4, tin must be +4 (IV).

Michelle Chan 1J

I agree with the post above. I remember from high school chem there were certain sig figs rules. For example, when multiplying or dividing, you answer with the least number of sig figs in the problem. For addition and subtraction, the answer can not contain more decimal places than the least precise...

Michelle Chan 1J

Molarity is moles/volume of solution. So to use (b) as an example, first I would find the moles of S ions in 0.500g of K2S with stoichiometry --> 0.500g K2S x 1 mol K2S/110.26g x 1 mol S/ 1 mol K2S. Then convert 500. mL of volume to 0.5 L. Finally, divide the number of moles by volume to get M. Hope...

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