CHEMISTRY COMMUNITY

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I'm going to try to do all of the practice problems again!

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So just to confirm, does polarity have anything to do with if there are single, double, or triple bonds? Just as VSEPR structures daren't drawn according to whether they have single, double, or triple bonds, polarity is also not determined in this way. Polarity doesn't have to do with single, doubl...

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It's hard to specifically calculate bond angles but just know that bent structures that have more lone pairs will have a smaller angle.

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Doe a molecule with a double bond always have a higher boiling point than a molecule that has single bonds but more bonds?

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On test 3, it asked for us to identify one intermolecular force for different compounds. Why is it wrong if I just put London dispersion forces? aren't London dispersion forces in everything?

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Amine refers to the functional group NH2. Ammine is formed by multiple amines.

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Are pi bonds always just 2p?

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When writing out the notation to indicate hybridization within sigma bonds, I noticed that the textbook writes it as 2sp2. A good reference is question 4.95. Basically why is it written as 2sp2 instead of sp2?

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It is different for every compound so there is no set amount and if there was a set amount it would have to be figured out experimentally

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Atoms of the non-central atoms are often only bonded with the central atom while the central atom is bonded to multiple atoms. Hence, the lone pairs on the central atom affect all of the atoms surrounding it but the lone pairs on the non-central atoms have no other atoms to affect.

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Double bonds do not affect VSEPR structures. Just know that double bonds are shorter than single bonds and are classified as pi bonds

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Just know that triple bonds are shorter than double bonds and double bonds are shorter than single bonds.

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The question will indicate if it wants you to draw the VSEPR model or lewis structure it just depends

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What are some exceptions to the octet rule that I should know for sure? Also is it true that basically all elements past period 3 don't obey the octet rule?

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Solve for the work function using the equation Ek = hv – work function. Usually the problem will give you the info needed to plug in values into this equation. The work function is usually in joules.

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It is only used for kinetic energy. It is specifically given as the equation for kinetic energy on the equations sheet so there is no reason to think that it is used for other types of energy

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In the video modules, professor Lavelle said that the Rydberg equation is v=-R [(1/n^2) - (1/n^2) , but the textbook says that the correct equation is v= R [(1/n^2) - (1/n^2). Why did professor Lavelle say to add a negative to the Rydberg constant and which one is correct?

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Could someone explain the concept of probability density? the textbook defines it as the probability that the particle will be found in a small region divided by the volume of the region. I don't really understand what probability density is.

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The Schrodinger equation is for when you want to find what energy levels are allowed. The wave function provides the probability of finding the particle at a specific position. It is not responsible for shapes in an atom.

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Coulombic attraction is the distance between the charged particles. The farther apart they are the weaker the attractive force and the closer they are the stronger the attractive force.

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Depending on the situation, light can be seen to be in either waves or photons, and there are different equations that you can use to observe these properties.

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An electron jumping to a new energy level means that it is gaining energy. When energy increases, wavelength decreases. Therefore, when an electron jumps to a new energy level, the wavelength decreases.

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I think you should have a general idea of what the order is of the wavelengths from smallest to largest and around what range each of the types of radiation are in but you do not need to know specifically.

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I think 2.998x10^8 is a better choice because it is ore accurate and aligns with the textbook

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It doesn't matter but make sure that if you are using mL you are using mL for both Vinitial and Vfinal. The reason it doesn't matter whether it is mL or L it is the same ratio.

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For both atoms and molecules, 1 mol is 6.022x10^23. so whatever the problem wants you to find, you can use Avogadro's number to find it.

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Sig figs are not affected by constants. The amount of sig figs that you use in your answer should be the amount of the value given in the problem.

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The molar mass of the metal hydroxide M(OH)2 is 74.10 g/mol. What is the molar mass of the sulfide of this metal? could someone explain this step by step? The solutions manual is confusing because it says that the answer should be the molar mass of calcium sulfide but I don't get how calcium sulfide...

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When converting moles to atoms, I usually just use 6.02*10^23. However the solutions manual uses 6.022*10^23 and so my answers do not match up exactly with the solutions manual. Should I always be using 6.022 instead of 6.02? Or does it depend on the problem and how many sig figs the problem provides?

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E.9 Epsom salts consist of magnesium sulfate heptahydrate. How many atoms of oxygen are in 5.15 g of Epsom salts? For this question I know that you have to convert the 5.15 g given to moles in order to get the molar value of MgSO4*7H2O. However I do not understand how you can figure out the atoms of...

CHEMISTRY COMMUNITY

Search found 30 matches

Re: Studying

Re: polarity

Re: Bent Structures

bond strength

London dispersion forces

Re: Naming

pi bonds

hybridization notation

Re: Bond Angle

Re: Electron density of lone pairs

Re: Double bonds

Re: Calculating Bond Length

Re: Molecular shape and structure

Exceptions to Octet Rule

Re: Work Function

Re: Kinetic energy

Rydberg equation

Probability Density

Re: Schrodinger question

Re: Coulomb

Re: Is light in waves or photons?

Re: Energy Level Question

Re: Wavelengths and frequencies

Re: Calculating the wavelength of light

Re: Finding the volume of stock solution to dilute

Re: Atoms and Molecules

Re: Should Significant Figures be affected by constants?

fundamentals e15

sig fig for avogadros number

Fundamentals E.9