Search found 33 matches
- Fri Dec 07, 2018 5:17 pm
- Forum: Bronsted Acids & Bases
- Topic: Bronsted Acids
- Replies: 2
- Views: 456
Re: Bronsted Acids
Bronsted acids just proton donators. It does not matter the atoms as long as it fulfills this definition.
- Fri Dec 07, 2018 5:10 pm
- Forum: Bronsted Acids & Bases
- Topic: acidity
- Replies: 4
- Views: 566
Re: acidity
The longer the bond the more stable the acid is. The resulting conjugate base does not want to attract the H after disassociating.
- Fri Dec 07, 2018 5:07 pm
- Forum: Bronsted Acids & Bases
- Topic: Identifying the difference
- Replies: 6
- Views: 580
Re: Identifying the difference
There are two definition you can use for acid and bases.
The Bronsted definition deals with the transfer of protons and the Lewis definition deals with the transfer of electrons.
The Bronsted definition deals with the transfer of protons and the Lewis definition deals with the transfer of electrons.
- Sun Dec 02, 2018 12:10 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Bromine Electron Configuration
- Replies: 2
- Views: 2574
Re: Bromine Electron Configuration
Ground state electron configuration starts from the beginning 1s2.
- Sun Dec 02, 2018 12:04 pm
- Forum: General Science Questions
- Topic: Final Review
- Replies: 4
- Views: 688
Re: Final Review
I felt all the workshops I have been too were super helpful. You can't go wrong with Karen Leung though.
- Sun Dec 02, 2018 12:00 pm
- Forum: Air Pollution & Acid Rain
- Topic: Acid Rain
- Replies: 3
- Views: 902
Re: Acid Rain
I don't know about the globe but I found some in formation about Acid Rain in the US https://water.usgs.gov/edu/acidrain.html It states that acid rain is usually a pH of 5.0-5.5 It also states that in the Northeast there can be rain with the pH of 4.0 I assume that in many places around the globe th...
- Sat Nov 24, 2018 1:35 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: double and triple bonds
- Replies: 10
- Views: 1093
Re: double and triple bonds
single, double, and triple bonds are all the same when using the VSEPR model.
- Sat Nov 24, 2018 1:32 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: polarity
- Replies: 3
- Views: 368
Re: polarity
I believe if it's fully symmetric than it would have to be non-polar considering an equal force on all sides. I am sure there are exceptions but I doubt we have to know them now.
- Sat Nov 24, 2018 1:26 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: vsepr model
- Replies: 3
- Views: 431
Re: vsepr model
Electron Geometry is what the shape is considering all the regions of e- density including lone pairs and connected atoms to the center element. Molecular geometry is the shape considering only the connected atoms but while still using the electron repulsion of the lone pairs. In case my wording is ...
- Thu Nov 15, 2018 9:12 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Memorizing the VSPER Models
- Replies: 4
- Views: 466
Re: Memorizing the VSPER Models
Another easy way to memorize VSPER shapes is to memorize which ones correspond to which VSPER formula.
- Thu Nov 15, 2018 9:08 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Vespr Formula
- Replies: 6
- Views: 530
Re: Vespr Formula
Here is an example to help.
The formula is all about what is connected to the center atom. The number after X means the number elements attached to the center element. E represents the number of electron lone pairs attached to the center element.
I hope that helped a little.
The formula is all about what is connected to the center atom. The number after X means the number elements attached to the center element. E represents the number of electron lone pairs attached to the center element.
I hope that helped a little.
- Thu Nov 15, 2018 9:02 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Double Bonds in VSEPR
- Replies: 5
- Views: 424
Re: Double Bonds in VSEPR
Single, double, and triple bonds are all the same when it comes to the molecular shape.
- Thu Nov 15, 2018 8:59 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sulfite Ion?
- Replies: 2
- Views: 326
Re: Sulfite Ion?
It is slightly less at 106 because the lone pair attached to the center atom has a stronger repulsion force than if it was another element.
So usually we would expect 109.5 degrees but since we know a lone pair pushes the atoms slightly harder we know the angle is going to be a little smaller.
So usually we would expect 109.5 degrees but since we know a lone pair pushes the atoms slightly harder we know the angle is going to be a little smaller.
- Sun Nov 11, 2018 7:03 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 12
- Views: 1101
Re: Bond Angles
I assume that if we are expected to memorize the angles it would be the most commons ones.
- Sun Nov 11, 2018 7:01 pm
- Forum: Lewis Acids & Bases
- Topic: Determine Lewis Acid
- Replies: 13
- Views: 1604
Re: Determine Lewis Acid
A lewis Acids accepts electrons.
- Sun Nov 11, 2018 4:42 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: Acid vs base [ENDORSED]
- Replies: 15
- Views: 1479
Re: Acid vs base [ENDORSED]
Lewis bases give electrons and Lewis acids receive electrons.
- Sat Nov 03, 2018 10:29 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
- Replies: 121
- Views: 17213
Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Will someone explain 8b? I know that we need to use all of the information given in the question but I am not sure how wavelength corresponds to work functions. Thank you! So the main equation you need is Eph = (work function of metal) - Ek (energy of electron ejected) This is not correct. See post...
- Thu Nov 01, 2018 4:50 pm
- Forum: Lewis Structures
- Topic: Expanded octets
- Replies: 6
- Views: 610
Re: Expanded octets
Any element below N=3 can have an expanded octet.
- Thu Nov 01, 2018 4:46 pm
- Forum: Lewis Structures
- Topic: Lewis Structures- formal charge
- Replies: 4
- Views: 477
Re: Lewis Structures- formal charge
This is the equation to find the formal charge.
Valance electrons - (lone pair electrons + number of bonds) = Formal charge.
Valance electrons - (lone pair electrons + number of bonds) = Formal charge.
- Thu Nov 01, 2018 4:43 pm
- Forum: Lewis Structures
- Topic: Lewis Structures
- Replies: 4
- Views: 504
Re: Lewis Structures
Any element in the 13th column does not need to have a full octet. This would include B, Al, Ga, In, Ti, and Nh.
However they are allowed to have 8 if the compound needs it.
However they are allowed to have 8 if the compound needs it.
- Thu Nov 01, 2018 4:40 pm
- Forum: Lewis Structures
- Topic: Valence Electrons
- Replies: 3
- Views: 380
Re: Valence Electrons
A quick and easy way to find out how many valance electrons an element has is to count left to right across periods for the S orbital and the P orbital. For example H would have 1 valance electron, Be would have 2, B would have 3, and C would have 4. This would make the noble gases have 8 valence el...
- Fri Oct 26, 2018 12:21 pm
- Forum: Properties of Light
- Topic: measuring wavelength
- Replies: 5
- Views: 501
Re: measuring wavelength
Anything below 10^-18 m is too small to measure.
However professor said that he will give either numbers that are super small or super big compared to 10^-18.
However professor said that he will give either numbers that are super small or super big compared to 10^-18.
- Fri Oct 26, 2018 12:19 pm
- Forum: Properties of Light
- Topic: The Uncertainty Principle
- Replies: 2
- Views: 340
Re: The Uncertainty Principle
1 joule = 1.60218e-19 Ev
It is given on the equation sheet in front of every test near the bottom.
It is given on the equation sheet in front of every test near the bottom.
- Fri Oct 26, 2018 12:12 pm
- Forum: Properties of Light
- Topic: Power calculations
- Replies: 6
- Views: 823
Re: Power calculations
Make sure the use parentheses around your numbers.
For example instead of doing 9 x 10^3 times 3 x 10^2
You should input the numbers like this (9 x 10^3) times (3 x 10^2)
It is important when dividing and doing things other than just multiplying.
For example instead of doing 9 x 10^3 times 3 x 10^2
You should input the numbers like this (9 x 10^3) times (3 x 10^2)
It is important when dividing and doing things other than just multiplying.
- Fri Oct 19, 2018 4:00 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Chem Community Due Date
- Replies: 6
- Views: 629
Re: Chem Community Due Date
I don't believe there is a set date on the syllabus but I'd recommend getting it done by Sunday of that week?.
- Fri Oct 19, 2018 3:57 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Equation sheet
- Replies: 4
- Views: 498
- Fri Oct 19, 2018 3:54 pm
- Forum: Properties of Light
- Topic: energy equation
- Replies: 4
- Views: 417
Re: energy equation
The above poster is correct.
The equation you are looking for is E = hc/λ
λ = wave length
E = energy
h = Planck constant
c = speed of light
H and C will be provided in the information sheet in the test.
The equation you are looking for is E = hc/λ
λ = wave length
E = energy
h = Planck constant
c = speed of light
H and C will be provided in the information sheet in the test.
- Fri Oct 19, 2018 12:47 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: Clarification on Heisenberg Equation
- Replies: 2
- Views: 310
Re: Clarification on Heisenberg Equation
Hello, The way I understood it is that the reason this is true is because of how your TA stated when they said "by the time we calculate momentum, the object's position has already changed". What I took away from why this is, is because the more you investigate the position, the less you c...
- Thu Oct 11, 2018 7:31 pm
- Forum: SI Units, Unit Conversions
- Topic: Units
- Replies: 8
- Views: 604
Re: Units
I'd also recommend putting the units as if it comes to partial credit for a question it might help who ever is grading it see what and where you went wrong. It could possibly improve your chances of getting more credit for a problem that would not have gotten it otherwise.
- Thu Oct 11, 2018 7:27 pm
- Forum: Empirical & Molecular Formulas
- Topic: Rounding for limiting reactants
- Replies: 5
- Views: 774
Re: Rounding for limiting reactants
I see that your question has been pretty much answered but I'd recommend using the limiting rule of on no more than .1 to check your work. If it takes you more than a few calculation to get to a whole number of moles it is clear something went wrong. I tend to make a lot of little mistakes so it hel...
- Sat Oct 06, 2018 1:45 pm
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
- Replies: 135
- Views: 38484
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
This is perfect! I've been looking for more practice problems. Looking forward to the workshop.
- Sat Oct 06, 2018 1:38 pm
- Forum: SI Units, Unit Conversions
- Topic: Formula Units?
- Replies: 6
- Views: 676
Re: Formula Units?
Formula units is the atoms I believe. First you have to get the moles of the element(s), To get this you have to use the given grams and divide it by the total molar mass found on the periodic table. You would multiply the moles with 6.0221409e+23 (Avogadro constant) to find out how many atoms or fo...
- Sat Oct 06, 2018 1:35 pm
- Forum: Significant Figures
- Topic: Rounding numbers ending in 5
- Replies: 9
- Views: 851
Re: Rounding numbers ending in 5
I believe the text book is covering the rounding that is used in banking and possibly in chem labs, it makes the numbers more easier to work with.
You should keep rounding the way you have been taught.
You should keep rounding the way you have been taught.