CHEMISTRY COMMUNITY

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Because they can accept an extra pair of electrons.

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The oxidation number of the central atom in a coordination compound depends on the oxidation number of the ligand.

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It is a special type of hydrogen bonding.

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Ph measures acidity of the solution, and POh measure how basic the solution is. P stands for the -log of []

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Poly means many. Polyprotic means lots of protons. Polyprotic acids can donate more than one protons and bases can accept more than one protons.

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Ligand is a Lewis base that can donate a pair of electrons. Note that Cl is not a Ligand but the electron-donating CL- is

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Because sigma bonds have greater overlap than pi bonds do.

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Yes you are right. It takes higher energy to break the bonds.

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All single covalent bonds have one and only one sigma bond, while double bonds and triple bonds have multiple pi bonds

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One or two lone pairs

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If it’s a single bond, then the bond is sigma. If it’s a double bond, then the bond is pi.

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Because the overlapping area of sigma bond is much bigger than pi bonds

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Stronger intermolecular force means higher boiling points

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Yes it is less because lone pair would require some kind of experiment to determine its actual value

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Because they occupy a bigger area than bonds do

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Because the Cl is much more electronegative than carbon

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Ionic is stronger than covalent, but ionic in water is weaker than covalent.

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Most likely the problem is not gonna tell you which equation to use, but you can use de broglie when there’s mass.

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Because they are pulled more closely to each other

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Covalent is intramolecular because it is within a molecule and between atoms

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Ionization energy has the same trend as electronegativity on the periodic table.

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As effective nuclear charge decreases the electrons are held less closely together, so the atomic radius is larger.

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Because the strength of the single bond is much weaker than double bonds, so the electrons are held less closely together.

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When making an exception can lower the formal charge or make it a lot more stable.

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If it is a metal bonding to a nonmetal, it is ionic.

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They help to stabilize the molecule.

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Electronegativity increases from left to right and from bottom to top across the periodic table.

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Then the bond is said to be polar. Since the more electronegative atom hogs more electrons to its side, it has a partial negative charge, while the other atom has a partially positive charge.

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The right way would be to write the 3D sub shell first

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We don’t need to calculate the electronegtivity but we do need to know the electronegativity of atoms relative to each other.

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You should round according to the least number of sig figs in a questions. Remember to keep as many sig fits as possible while doing to problem and round at the final step.

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How do you determine the ml value from l and n value? What's the rule for it?

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In order to be more stable, some electrons in certain atoms may not follow the rule. Remember that they want to be as "happy" as possible.

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Objects with this small of a wavelength does not have wave-like properties.

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505106414 wrote:Can someone explain what a shell is vs a subshell?

An energy shell is represented by n, while sub shells are spdf.

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The more protons the atom has, the more electronegative it is.

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the change in energy should not be negative when n goes from 1 to 3 because electrons need to absorb energy in order to do that, making the sign in front of delta always a positive one.

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I would recommend just using the equations found on the constant sheet on the website because they are all we have on the test and we can definitely solve all the problems using those equations.

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I always find it easy to do as many practice problems as I can. Be sure to expose yourself to different kinds of problems. It is always helpful to go to worshops or step-ups.

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Schrodinger's is used to calculate the energy level of atoms. De Broglie's is used to calculate the wavelength of a moving object.

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You should use the one Professor Lavelle gives us on his website. On the test, I usually keep as many sig figs as I can when I'm doing calculations to keep my answers as precise as possible.

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In this case, the chemical formula is both empirical and molecular.

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I know that magnetic forces result from moving charges and act on moving charges. Whereas electric forces are generated and used on charges. They are very similar and often go hands in hands with each other.

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E.g., the scale is off, your measurement is not perfectly precise, some of the reactants evaporate during the reaction.

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Usually I would do three, but I think 4 works better for certain questions. I would leave no more than 4.

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We only need to worry about percent yield when the problem asks us to do so. However, while doing experiments, we should always expect a difference between the theoretical and the actual

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Also, I think the order doesn't matter unless the question explicitly asks for it. It's not as strict as the other rules, as long as you can draw the right chemical structure from the formula.

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We should be familiar with the common polyatomic compounds and the prefixes, but I don't know if we need to have them memorized before our first test.

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For questions asking for formula units of a molecule, the unit for your answer should be atoms. So I think these questions are asking you to find N (i.e., number of molecules).

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I think either way it should be fine. As long as your steps are correct, having your final answer off by .1 should not be a problem.

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I think the latter one is right because there isn't any shortage of reactants in this case.

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