Search found 30 matches
- Thu Dec 06, 2018 4:34 pm
- Forum: Student Social/Study Group
- Topic: Studying
- Replies: 7
- Views: 932
Re: Studying
I'm going to try to do all of the practice problems again!
- Thu Dec 06, 2018 4:32 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: polarity
- Replies: 11
- Views: 851
Re: polarity
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...
- Thu Dec 06, 2018 4:16 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bent Structures
- Replies: 12
- Views: 1299
Re: Bent Structures
It's hard to specifically calculate bond angles but just know that bent structures that have more lone pairs will have a smaller angle.
- Thu Dec 06, 2018 4:13 pm
- Forum: Bond Lengths & Energies
- Topic: bond strength
- Replies: 3
- Views: 799
bond strength
Doe a molecule with a double bond always have a higher boiling point than a molecule that has single bonds but more bonds?
- Thu Dec 06, 2018 4:02 pm
- Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
- Topic: London dispersion forces
- Replies: 1
- Views: 337
London dispersion forces
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?
Re: Naming
Amine refers to the functional group NH2. Ammine is formed by multiple amines.
- Wed Nov 28, 2018 11:40 pm
- Forum: Hybridization
- Topic: pi bonds
- Replies: 5
- Views: 533
pi bonds
Are pi bonds always just 2p?
- Wed Nov 28, 2018 11:24 pm
- Forum: Hybridization
- Topic: hybridization notation
- Replies: 3
- Views: 406
hybridization notation
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?
- Mon Nov 19, 2018 12:44 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angle
- Replies: 8
- Views: 788
Re: Bond Angle
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
- Mon Nov 19, 2018 12:42 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Electron density of lone pairs
- Replies: 3
- Views: 317
Re: Electron density of lone pairs
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.
- Mon Nov 19, 2018 12:38 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Double bonds
- Replies: 8
- Views: 849
Re: Double bonds
Double bonds do not affect VSEPR structures. Just know that double bonds are shorter than single bonds and are classified as pi bonds
- Sun Nov 11, 2018 5:30 pm
- Forum: Resonance Structures
- Topic: Calculating Bond Length
- Replies: 3
- Views: 814
Re: Calculating Bond Length
Just know that triple bonds are shorter than double bonds and double bonds are shorter than single bonds.
- Sun Nov 11, 2018 5:26 pm
- Forum: Lewis Structures
- Topic: Molecular shape and structure
- Replies: 5
- Views: 599
Re: Molecular shape and structure
The question will indicate if it wants you to draw the VSEPR model or lewis structure it just depends
- Sun Nov 11, 2018 5:24 pm
- Forum: Lewis Structures
- Topic: Exceptions to Octet Rule
- Replies: 5
- Views: 1036
Exceptions to Octet Rule
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?
- Sat Nov 03, 2018 11:39 pm
- Forum: Photoelectric Effect
- Topic: Work Function
- Replies: 14
- Views: 2252
Re: Work Function
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.
- Sat Nov 03, 2018 11:34 pm
- Forum: Photoelectric Effect
- Topic: Kinetic energy
- Replies: 11
- Views: 3331
Re: Kinetic energy
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
- Sat Nov 03, 2018 12:33 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Rydberg equation
- Replies: 3
- Views: 840
Rydberg equation
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?
- Fri Nov 02, 2018 5:26 pm
- Forum: *Shrodinger Equation
- Topic: Probability Density
- Replies: 1
- Views: 499
Probability Density
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.
- Sun Oct 28, 2018 11:04 pm
- Forum: Properties of Electrons
- Topic: Schrodinger question
- Replies: 3
- Views: 2633
Re: Schrodinger question
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.
- Sun Oct 28, 2018 11:01 pm
- Forum: Properties of Electrons
- Topic: Coulomb
- Replies: 4
- Views: 695
Re: Coulomb
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.
- Sun Oct 28, 2018 10:52 pm
- Forum: Properties of Light
- Topic: Is light in waves or photons?
- Replies: 10
- Views: 968
Re: Is light in waves or photons?
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.
- Sun Oct 21, 2018 12:01 am
- Forum: Properties of Electrons
- Topic: Energy Level Question
- Replies: 4
- Views: 375
Re: Energy Level Question
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.
- Sat Oct 20, 2018 11:53 pm
- Forum: Properties of Light
- Topic: Wavelengths and frequencies
- Replies: 10
- Views: 697
Re: Wavelengths and frequencies
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.
- Sat Oct 20, 2018 11:38 pm
- Forum: Properties of Light
- Topic: Calculating the wavelength of light
- Replies: 7
- Views: 1213
Re: Calculating the wavelength of light
I think 2.998x10^8 is a better choice because it is ore accurate and aligns with the textbook
- Thu Oct 11, 2018 12:09 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Finding the volume of stock solution to dilute
- Replies: 13
- Views: 1347
Re: Finding the volume of stock solution to dilute
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.
- Thu Oct 11, 2018 11:59 am
- Forum: SI Units, Unit Conversions
- Topic: Atoms and Molecules
- Replies: 5
- Views: 421
Re: Atoms and Molecules
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.
- Thu Oct 11, 2018 11:54 am
- Forum: SI Units, Unit Conversions
- Topic: Should Significant Figures be affected by constants?
- Replies: 10
- Views: 977
Re: Should Significant Figures be affected by constants?
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.
- Wed Oct 03, 2018 4:29 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: fundamentals e15
- Replies: 4
- Views: 533
fundamentals e15
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...
- Wed Oct 03, 2018 4:05 pm
- Forum: Significant Figures
- Topic: sig fig for avogadros number
- Replies: 3
- Views: 2089
sig fig for avogadros number
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?
- Wed Oct 03, 2018 3:55 pm
- Forum: Molarity, Solutions, Dilutions
- Topic: Fundamentals E.9
- Replies: 2
- Views: 189
Fundamentals E.9
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...