Search found 30 matches

by 305115396
Thu Dec 06, 2018 4:34 pm
Forum: Student Social/Study Group
Topic: Studying
Replies: 7
Views: 139

Re: Studying

I'm going to try to do all of the practice problems again!
by 305115396
Thu Dec 06, 2018 4:32 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: polarity
Replies: 11
Views: 75

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...
by 305115396
Thu Dec 06, 2018 4:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent Structures
Replies: 12
Views: 113

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.
by 305115396
Thu Dec 06, 2018 4:13 pm
Forum: Bond Lengths & Energies
Topic: bond strength
Replies: 3
Views: 63

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?
by 305115396
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: 42

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?
by 305115396
Thu Dec 06, 2018 3:59 pm
Forum: Naming
Topic: Naming
Replies: 1
Views: 43

Re: Naming

Amine refers to the functional group NH2. Ammine is formed by multiple amines.
by 305115396
Wed Nov 28, 2018 11:40 pm
Forum: Hybridization
Topic: pi bonds
Replies: 5
Views: 72

pi bonds

Are pi bonds always just 2p?
by 305115396
Wed Nov 28, 2018 11:24 pm
Forum: Hybridization
Topic: hybridization notation
Replies: 3
Views: 50

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?
by 305115396
Mon Nov 19, 2018 12:44 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angle
Replies: 8
Views: 94

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
by 305115396
Mon Nov 19, 2018 12:42 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Electron density of lone pairs
Replies: 3
Views: 39

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.
by 305115396
Mon Nov 19, 2018 12:38 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Double bonds
Replies: 8
Views: 117

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
by 305115396
Sun Nov 11, 2018 5:30 pm
Forum: Resonance Structures
Topic: Calculating Bond Length
Replies: 3
Views: 77

Re: Calculating Bond Length

Just know that triple bonds are shorter than double bonds and double bonds are shorter than single bonds.
by 305115396
Sun Nov 11, 2018 5:26 pm
Forum: Lewis Structures
Topic: Molecular shape and structure
Replies: 5
Views: 95

Re: Molecular shape and structure

The question will indicate if it wants you to draw the VSEPR model or lewis structure it just depends
by 305115396
Sun Nov 11, 2018 5:24 pm
Forum: Lewis Structures
Topic: Exceptions to Octet Rule
Replies: 5
Views: 61

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?
by 305115396
Sat Nov 03, 2018 11:39 pm
Forum: Photoelectric Effect
Topic: Work Function
Replies: 14
Views: 252

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.
by 305115396
Sat Nov 03, 2018 11:34 pm
Forum: Photoelectric Effect
Topic: Kinetic energy
Replies: 8
Views: 138

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
by 305115396
Sat Nov 03, 2018 12:33 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Rydberg equation
Replies: 3
Views: 160

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?
by 305115396
Fri Nov 02, 2018 5:26 pm
Forum: *Shrodinger Equation
Topic: Probability Density
Replies: 1
Views: 46

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.
by 305115396
Sun Oct 28, 2018 11:04 pm
Forum: Properties of Electrons
Topic: Schrodinger question
Replies: 3
Views: 100

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.
by 305115396
Sun Oct 28, 2018 11:01 pm
Forum: Properties of Electrons
Topic: Coulomb
Replies: 4
Views: 108

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.
by 305115396
Sun Oct 28, 2018 10:52 pm
Forum: Properties of Light
Topic: Is light in waves or photons?
Replies: 10
Views: 199

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.
by 305115396
Sun Oct 21, 2018 12:01 am
Forum: Properties of Electrons
Topic: Energy Level Question
Replies: 4
Views: 46

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.
by 305115396
Sat Oct 20, 2018 11:53 pm
Forum: Properties of Light
Topic: Wavelengths and frequencies
Replies: 10
Views: 92

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.
by 305115396
Sat Oct 20, 2018 11:38 pm
Forum: Properties of Light
Topic: Calculating the wavelength of light
Replies: 7
Views: 79

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
by 305115396
Thu Oct 11, 2018 12:09 pm
Forum: Molarity, Solutions, Dilutions
Topic: Finding the volume of stock solution to dilute
Replies: 12
Views: 209

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.
by 305115396
Thu Oct 11, 2018 11:59 am
Forum: SI Units, Unit Conversions
Topic: Atoms and Molecules
Replies: 5
Views: 104

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.
by 305115396
Thu Oct 11, 2018 11:54 am
Forum: SI Units, Unit Conversions
Topic: Should Significant Figures be affected by constants?
Replies: 10
Views: 174

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.
by 305115396
Wed Oct 03, 2018 4:29 pm
Forum: Molarity, Solutions, Dilutions
Topic: fundamentals e15
Replies: 4
Views: 73

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...
by 305115396
Wed Oct 03, 2018 4:05 pm
Forum: Significant Figures
Topic: sig fig for avogadros number
Replies: 3
Views: 45

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?
by 305115396
Wed Oct 03, 2018 3:55 pm
Forum: Molarity, Solutions, Dilutions
Topic: Fundamentals E.9
Replies: 2
Views: 58

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...

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