Search found 32 matches
- Sat Jul 27, 2019 9:15 pm
- Forum: Naming
- Topic: ethylenediamine [ENDORSED]
- Replies: 4
- Views: 707
Re: ethylenediamine [ENDORSED]
Yes, as it's a polydentate ligand.
- Sat Jul 27, 2019 9:13 pm
- Forum: Biological Examples
- Topic: Iron in myoglobin [ENDORSED]
- Replies: 2
- Views: 2318
Re: Iron in myoglobin [ENDORSED]
This diagram of myoglobin's structure shows that only one O can bond as there are already 5 other bonds taking place.
- Sat Jul 27, 2019 9:10 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Polydentate
- Replies: 8
- Views: 2185
Re: Polydentate
To determine the kind of -dentate, figure out the number of lone pairs that can act as donors.
- Sat Jul 27, 2019 9:03 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: edta
- Replies: 8
- Views: 1960
Re: edta
As we know, edta is hexadente, hexa = 6 bonds.
Re: CN Charge
The CN ligand has a -1 charge.
- Sat Jul 27, 2019 9:01 pm
- Forum: Naming
- Topic: naming polydentate ligands
- Replies: 2
- Views: 546
Re: naming polydentate ligands
Yes, we always use the other set of prefixes (bis, tris, etc) for polydentate ligands.
- Sat Jul 27, 2019 8:57 pm
- Forum: Naming
- Topic: Regarding the test... [ENDORSED]
- Replies: 12
- Views: 5819
Re: Regarding the test... [ENDORSED]
Yeah, Kw is provided, it's on the formula sheet, near the bottom.
- Sat Jul 20, 2019 7:26 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Polarity
- Replies: 7
- Views: 706
Re: Polarity
A polar bond is when the bonded atoms have different electronegativities; this causes uneven electron distribution, and makes it "polar."
- Sat Jul 20, 2019 7:23 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: name of molecule structure
- Replies: 4
- Views: 1649
Re: name of molecule structure
This shape is known as a seesaw shape, where the it can be written as AX4E
- Sat Jul 20, 2019 6:58 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: A.X.E.
- Replies: 4
- Views: 654
Re: A.X.E.
No, lone pairs are represented by E.
- Sat Jul 20, 2019 6:25 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: AXE formula
- Replies: 32
- Views: 12258
Re: AXE formula
Yes, you can determine shape with the AXE formula. You should try to memorize them because it'll save time and guarantee correctness on exams, but you can also think about it in terms of regions of electron density, where X represents bonding pairs on the central atom and E represents lone pairs on ...
- Sat Jul 20, 2019 6:13 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Induced dipoles
- Replies: 7
- Views: 936
Re: Induced dipoles
Electrons, by chance, can clump in a particular section of an atom, forming partial negative and positive charges. These charges can cause electrons in nearby atoms to move around and clump together. Therefore, the dipole is "induced" by another atom's charge distribution.
- Thu Jul 18, 2019 9:47 am
- Forum: Lewis Structures
- Topic: What is the correct Lewis structure for BrO+?
- Replies: 3
- Views: 2387
Re: What is the correct Lewis structure for BrO+?
Since oxygen is more electronegative, it's not going to take on the +1 formal charge as easily as bromine. As a result, it's double bonded, and bromine has a +1 formal charge while oxygen has a 0 formal charge.
- Sat Jul 13, 2019 1:11 am
- Forum: Ionic & Covalent Bonds
- Topic: Ground State
- Replies: 13
- Views: 1475
Re: Ground State
When writing electron configurations of ions, you should write out the uncharged electron configuration first, then add and subtract from there. Since Cu is one of the exceptions, its uncharged electron configuration is [Ar]3d^(10) 4s^(1). Now to make the +1 cation you take off the last electron, ma...
- Sat Jul 13, 2019 1:05 am
- Forum: Lewis Structures
- Topic: Molecular Geometry
- Replies: 2
- Views: 536
Re: Molecular Geometry
The bond angles for a T-shape are 180 degrees, 90 degrees, and 90 degrees, creating a "T-shape" as the name implies.
- Sat Jul 13, 2019 12:54 am
- Forum: Electronegativity
- Topic: Nonmetals?
- Replies: 6
- Views: 753
Re: Nonmetals?
Most of the time, nonmetals are indeed more electronegative than metals because they are closer to a full octet, meaning they REALLY want more electron(s).
- Sat Jul 13, 2019 12:53 am
- Forum: Electronegativity
- Topic: Radius
- Replies: 13
- Views: 1614
Re: Radius
An increase in electronegativity means that an atom has a stronger pull on bonding electrons. With larger atomic radii, electrons are further away from the nucleus. It makes sense that they have opposite trends because electrons being further away from the nucleus have less attraction according to t...
- Fri Jul 12, 2019 11:38 pm
- Forum: Electronegativity
- Topic: Electronegativity vs ionization energy
- Replies: 7
- Views: 1007
Re: Electronegativity vs ionization energy
Electronegativity is a measure of how strongly an atom attracts electrons. Ionization energy is a measure of the energy required to lose an electron. It makes sense that they have the same trend because an atom that strongly attracts electrons (high electronegativity) would require more energy to gi...
- Fri Jul 12, 2019 11:30 pm
- Forum: Electronegativity
- Topic: Trend of Electronegativity
- Replies: 18
- Views: 4248
Re: Trend of Electronegativity
The general trend for electronegativity is that it increases across a period and decreases down a group. I think of it as being at its highest at the top right, and at its lowest at the top left. Fluorine (F) is the most electronegative element.
- Sat Jul 06, 2019 4:54 pm
- Forum: Einstein Equation
- Topic: E=hv [ENDORSED]
- Replies: 52
- Views: 18454
Re: E=hv [ENDORSED]
E in E=hv represents the energy of a photon.
- Sat Jul 06, 2019 4:46 pm
- Forum: Einstein Equation
- Topic: Energy of photon [ENDORSED]
- Replies: 12
- Views: 1862
Re: Energy of photon [ENDORSED]
The method you use to calculate the energy of a photon depends on what the problem gives you. The equation for the energy of a photon E (energy of photon) = h (planck constant) * v (frequency). c = \lambda v can be substituted into the previous equation if they give you values other than frequency.
- Sat Jul 06, 2019 4:36 pm
- Forum: Properties of Electrons
- Topic: Electron Configuration
- Replies: 9
- Views: 1185
Re: Electron Configuration
As others have said, this is an exception to the normal rules of electron configurations. As Dr. Lavelle said in class, the reasons behind this involve the fact that as the principal quantum number (n) increases, orbitals get closer and closer together. By the time that n=5, such as in your case, ex...
- Sat Jul 06, 2019 4:32 pm
- Forum: Properties of Electrons
- Topic: Electron Spin
- Replies: 7
- Views: 917
Re: Electron Spin
Electron spin represents the angular momentum of electrons, and is noticeable when electrons interact with magnetic fields. In each individual orbital, there is one electron with a +1/2 spin and one electron with a -1/2 spin.
- Sat Jul 06, 2019 4:25 pm
- Forum: Properties of Light
- Topic: wavelength
- Replies: 11
- Views: 1839
Re: wavelength
Wavelength is commonly known as the "peak to peak" distance, but you can also use trough to trough distance. Amplitude is the "height" of the wave.
- Fri Jul 05, 2019 2:38 am
- Forum: Properties of Light
- Topic: Speed of Light
- Replies: 41
- Views: 2861
Re: Speed of Light
The speed of light is constant, and is represented in class as c = 3.00 x 10^8 m/s
- Sat Jun 29, 2019 3:53 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Theoretical/Actual Yield
- Replies: 6
- Views: 808
Re: Theoretical/Actual Yield
Yield will be calculated as a mass, usually just grams, but you could also see kg or mg in some problems. For percent yield, you're dividing a unit by the same unit so it cancels (like grams/grams) which is why percent yield doesn't have a mass unit, it's just a percentage.
- Sat Jun 29, 2019 3:51 pm
- Forum: Significant Figures
- Topic: Sig Figs in the Middle of a Problem
- Replies: 9
- Views: 2501
Re: Sig Figs in the Middle of a Problem
By using significant figures only in your final answer, you reduce the chance of creating rounding errors. Be sure to use your scientific calculator for calculations and use the unrounded numbers until you get to your final answer, which you should use significant figures for.
- Sat Jun 29, 2019 3:48 pm
- Forum: Significant Figures
- Topic: Determining sig figs
- Replies: 10
- Views: 2433
Re: Determining sig figs
The difference is that 100 grams of something has 1 significant figure, while 100. grams of something has 3 significant figures. This is because the decimal point shows that the number is exact.
- Sat Jun 29, 2019 3:46 pm
- Forum: Significant Figures
- Topic: All students read this sig fig post [ENDORSED]
- Replies: 170
- Views: 35352
Re: All students read this sig fig post [ENDORSED]
Yes, it was stated in class that incorrect significant figures would lead to a deduction of 1 point from your answer. You only need to worry about them when writing your final answer though. When multiplying and dividing (so most of the problems) your answer must use the fewest number of significant...
- Thu Jun 27, 2019 3:24 pm
- Forum: Balancing Chemical Reactions
- Topic: Combustion Equation
- Replies: 21
- Views: 2843
Re: Combustion Equation
Regarding elements other than carbon, oxygen, and hydrogen in combustion, my TA said that if there are questions concerning more complicated combustion reactions, a chemical equation would be given. We are only expected to memorize the "typical" combustion equation for this first test.
- Thu Jun 27, 2019 3:20 pm
- Forum: Balancing Chemical Reactions
- Topic: H5 7th edition
- Replies: 4
- Views: 505
Re: H5 7th edition
It counts towards balancing the equation because subscripts display the number of atoms of a particular type. The important thing to remember regarding subscripts is that if you have, for example, (OH)2 where 2 is a subscript, you have 2 O atoms and 2 H atoms. In other words, the subscript 2 is sort...
- Thu Jun 27, 2019 12:19 am
- Forum: SI Units, Unit Conversions
- Topic: Can someone explain why we use kg for mass as the base unit?
- Replies: 9
- Views: 969
Re: Can someone explain why we use kg for mass as the base unit?
Kilograms are our base unit of mass because they are helpful/coherent with other units in science. The example Dr. Lavelle used in class was that of Joules, where 1J = (1 m * kg^2) / s^2.