CHEMISTRY COMMUNITY

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You can't compare the atomic radius because all of the hydrogen atoms are bonded to the oxygen atom. When you consider the atomic radius, it's to consider the bond length; the bigger the atomic radius, the longer the bond length and therefore the weaker the bond. However, the hydrogen atoms in all o...

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What are all of these constants and how can they be found?

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The constants and equations pdf that is on Professor Lavelle's website is the one that is provided on the tests, right?

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Do we have to memorize the names of acids? For example, how HNO2 is nitrous acid and HCLO3 is chloric acid? If so, can someone list the molecular formula and the names of all of the common acids please? Thank you!

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How do we know which ligands are polydentate by looking at the coordination compound formula? For example, in HN(CH2CH2NH2)2?

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When do we say bis instead of bi when naming coordination compounds?

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If we had to write out the formula for tetraamminediaquacobalt(III) bromide, how are we supposed to know that it's Br3?

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In one of the homework problems, there is a question asking if a bond angle would increase or decrease as the S character of a hybrid orbital increases? What does the "s character" mean? Can someone explain this please? Thank you

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And if, for example, SF4 had to be drawn, the dipoles wouldn't cancel even though all four atoms surround S are the same because S has a lone pair, correct?

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To cancel dipoles, does the electronegative atoms basically have to be straight across from each other? Why can't dipoles cancel, for example, in CH2Cl2?

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In Monday's lecture, Professor Lavelle had questions on the slides and one of them was "Is an acid with pKa of 4.22 neutral or negatively charged at pH 6?" Does anyone know the answer and have an explanation for this?

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How do we know when to use the Latin name of the element instead of the periodic table's name of the element when naming coordination compounds?

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Can someone list the charges of common polyatomic ions and ligands, please? Thank you!

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Do we have to memorize the Latin names of certain elements when naming coordination compounds? Like how iron would be "ferrate"?

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Is memorizing the only way to know the charges of ligands? How are we supposed to know the charges? Do we have to draw the lewis structure and calculate the charges?

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Will ligands always have no charge?

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What exactly is a porphyrin ligand?

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What do we need to know about porphyrin ligands?

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What is a coordinate covalent bond?

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What is a conjugate?

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Can someone explain the concept behind complexes?

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Can someone explain the concept behind coordination compounds?

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Can someone list the order in which we name compounds?

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They would only be nonpolar if there was one central atom and all of the other atoms were the same element.

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Bronsted acids are proton donors whereas lewis acids are electron acceptors.

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Is memorizing the only way to know the ionic charges in the periodic table?

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Coordination number is always equal to the number of bonds the central atom has made so if there are 6 bonds for en and edta, then yes. The coordination number will always be 6.

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What's the overlying concept behind hybridization?

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What's the concept behind the polarizability of anions/cations?

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When do dipole moments cancel?

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Do we have to know how to calculate the strength of bonds for test 2? If so, how do we do that?

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How do we draw dipole moments?

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How do we determine which bonds are polar or not?

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During lecture on 11/15, Dr. Lavelle said molecules with the same formula will have the same general shape. Can someone list all of the different formulas and the corresponding general shape please? Thank you

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Do we need to know how to calculate anything for Test 2? Or will it all pretty much be concept based?

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Which topics do we have to study for test 2?

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Which outline are we supposed to choose homework questions from for week 7?

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I know that if the difference in electronegativity is greater than 2, it is an ionic bond and if it is less than 1.5, it is a covalent bond. On the midterm, would the electronegativity be given to us so that we can calculate it? Also, what do we do about the gray area between 1.5 and 2? How would we...

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Are we expected to know how to draw a lewis structure of something without the molecular formula? For example, if they say "Draw a lewis structure of a periodate ion?"

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How are we supposed to know which atom will be the central atom when drawing a lewis structure?

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Is everything up until electronegativity going to be on the midterm?

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Delocalization only applies to resonance structures, correct?

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Can someone define electronegativity, electron affinity, and ionization energy and explain the concept behind the trends please?

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Are we going to be given the scenarios where there are exceptions to the octet rule so that we can memorize them?

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The further away an electron is from the nucleus, the higher the energy of the electron, correct?

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My TA told us that we should just be writing it all in one line...so 1s with the orbital notation above it, 2s with the orbital notation above it and so on.

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Post the entire question please.

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I'm assuming so. It shouldn't be too difficult since they are kind of grouped together.

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No it does not. As long as you end up having the correct number of electrons in the end.

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How do we know what order to write the electron configuration of a particular element? In other words, how do I know when the d comes before the p?

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Does anyone have any recommendations on how to study effectively for the midterm?

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For homework week 4, we can still do questions from the quantum world section, right?

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The velocity of an electron emitted from a metallic surface by a photon is 3.6*10^3 km/s. What is the wavelength of the ejected electron? I know we use the formula wavelength=h/mv which would give me (6.626*10^-34 J/s)/[(9.11x10^-31 kg)(3.6*10^6 m/s)]. However, after using this formula, how do we kn...

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Sodium vapor lamps, used for public lighting, emit yellow light of wavelength 589 nm. How much energy is emitted by an excited sodium atom when it generates a photon? I looked in the solutions manual and it showed the formula E=h*frequency and c=wavelength*frequency, and then derived the formula E=h...

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The gamma ray photons emitted by nuclear decay of technetium-99 atom used in radoopharmaceuticals have an energy of 140.511 keV. Calculate the wavelength of these gamma rays. In the solutions manual, they convert keV to Joules and I understand why, but why did they multiply 140.511 by 10^3?

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Can someone explain how to convert from meters to nanometers? For example, if you have 2.26*10^-46 m, how would you convert it to nanometers? And just in general, how do you remember conversions/units.

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How do we know when to use which formula? For example, there's 1) wavelength = c/frequency, 2) wavelength = hc/E, and 3) wavelength = h/(mass)(velocity). Someone please explain, thank you.

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I just want to double check something. So, if we are certain of the momentum, does the uncertainty of the position increase? And vise versa, if we are certain of the position, does the uncertainty of the momentum increase? Also, when the two uncertainties are multiplied, does getting an answer that ...

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I believe the "V" for frequency is actually the greek symbol "nu" so it looks a little different than the normal letter V.

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We are allowed to use scientific calculators. We are not allowed to use graphing calculators.

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All of this is covered in fundamental D which is about nomenclature.

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Does the molarity always have to be in mol/L in regards to the test? Question G19 says, "A sample of 1.345 M K2SO4 of volume 12.56 mL is diluted to 250 mL. What's the molar concentration of K2SO4?" I thought that when finding the molarity of K2SO4 in this problem, we would have to convert ...

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I know we are allowed to choose five questions from the HS review for our week 2 hw, but does anyone know if we are allowed to do the same questions as the ones we did on week 1 hw? Not purposely, but because I don't remember which questions I did.

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Which polyatomic ions and their charges do we have to know for the HS review test?

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Do we just need to know the common polyatomic ions and their charges for the HS review test?

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How do you find the amount in moles of F- ions in 25.2 kg of UF6?

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How does the molar mass change when you have an ion? Is it calculated the same as always?

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I am also interested!

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Part B of question E9 asks to find how many formula units of the compound (magnesium sulfate heptahydrate) are present in 5.15g. How would I solve this?

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In hw question E9, it asks us to write the formula of magnesium sulfate heptahydrate. Are we expected to know how to write molecular formulas of compounds for the test?

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The empirical formula and the molecular formula are the same sometimes which is why you got 1.

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Yes. I heard that he will take points off if you don't get the sig figs correct.

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One that I saw often was a substance being combusted/burned/oxidized. For this, you would write down the molecular formula of the substance being burned + Oxygen → Water + Carbon Dioxide. Burning a substance always produces water and carbon dioxide, so once you write this down, you just need to bala...

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