Search found 30 matches

by MaggieMatern_Dis1H
Sun Dec 09, 2018 9:21 am
Forum: Amphoteric Compounds
Topic: Amphiprotic vs Amphoteric
Replies: 5
Views: 259

Re: Amphiprotic vs Amphoteric

amphiprotic and amphoteric refer to the Bronsted and Lewis defintions of acids and bases, respectively. Therefore look to see if it gives/receives a proton and is an electron pair donor/acceptor.
by MaggieMatern_Dis1H
Wed Dec 05, 2018 11:31 pm
Forum: Naming
Topic: Naming
Replies: 2
Views: 68

Re: Naming

e.g. diethylenediamine would be written bisethylenediamine because DI is already in the name
by MaggieMatern_Dis1H
Wed Dec 05, 2018 11:26 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Terminology
Replies: 2
Views: 39

Re: Terminology

chelating agents remove metal cations, but are characterized by the RING that they form around these cations, which serves to "trap" them. https://www.google.com/url?sa=i&source=images&cd=&ved=2ahUKEwi20MG91orfAhWFLnwKHVnBBAsQjRx6BAgBEAU&url=https%3A%2F%2Fwww.slideshare.net...
by MaggieMatern_Dis1H
Wed Dec 05, 2018 11:22 pm
Forum: Identifying Acidic & Basic Salts
Topic: HF
Replies: 4
Views: 261

Re: HF

electronegativity is NOT a factor in determining bond strength. The only factors are atomic radius and bond multiplicity (i.e. is it a single, double or triple bond). Cl is a larger atom, so the bond length between it and H will be longer than that of F and H, making it a weaker bond, easier to brea...
by MaggieMatern_Dis1H
Wed Nov 28, 2018 10:41 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: diamagnetism and paramagnetism
Replies: 2
Views: 74

Re: diamagnetism and paramagnetism

Another note is that paramagnetic compounds are radicals because they possess an unpaired electron.
by MaggieMatern_Dis1H
Wed Nov 28, 2018 10:38 pm
Forum: Hybridization
Topic: hybridized orbitals
Replies: 2
Views: 63

Re: hybridized orbitals

Hybridized orbitals form when atoms are bonding, and they create a new (i.e. lower) energy level for electrons to occupy. This is favorable because electrons always want to occupy the lowest energy level possible.
by MaggieMatern_Dis1H
Wed Nov 28, 2018 10:31 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Square Pyramidal
Replies: 2
Views: 73

Re: Square Pyramidal

https://www.google.com/url?sa=i&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwjvn4mC_fjeAhUT0lQKHeHrCqwQjRx6BAgBEAU&url=http%3A%2F%2Facademic.pgcc.edu%2F~rgross%2FGeometry%2520Predictor%2FSquare%2520pyramidal%2520sp3d2%2FExamples%2520of%2520square%2520pyramidal%2520structures_...
by MaggieMatern_Dis1H
Wed Nov 28, 2018 8:13 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Shape and Lewis Structure
Replies: 1
Views: 29

Re: Shape and Lewis Structure

If the question specifically asks for Lewis structure, I think it would be best to draw it out. However, it is usually helpful to draw or name the shape as well, as doing so helps you determine the polarity of the molecule.
by MaggieMatern_Dis1H
Tue Nov 13, 2018 1:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Polar vs. NonPolar
Replies: 5
Views: 112

Re: Polar vs. NonPolar

It is also important to note that molecular structure plays an important role in polarity. For example, C02 would be expected to be a polar molecule, since the difference in electronegativity of C and O is large. However, the two O's are on either side of the C, giving it a linear shape. Due to this...
by MaggieMatern_Dis1H
Tue Nov 13, 2018 1:19 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: Hydrogen Bonding Question
Replies: 3
Views: 49

Re: Hydrogen Bonding Question

Hydrogen bonds are less transient than other VDW, making them stronger. A fluctuating dipole is instantaneous and unpredictable, whereas the partial negative/positive charges found in hydrogen bonds are more constant, and can be thought of as being 'always present'. It is easier to break a temporary...
by MaggieMatern_Dis1H
Tue Nov 13, 2018 1:16 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: Boiling point
Replies: 12
Views: 253

Re: Boiling point

A rod or oval shaped molecule has more surface area with which it can interact with another oval molecule, increasing the VDW interactions between the two, making the bond stronger, harder to break, and resulting in a higher melting point. A circular molecule has less surface area with which it can ...
by MaggieMatern_Dis1H
Tue Nov 06, 2018 5:47 pm
Forum: Octet Exceptions
Topic: Lewis acids and bases
Replies: 3
Views: 97

Re: Lewis acids and bases

https://opentextbc.ca/chemistry/wp-content/uploads/sites/150/2016/05/CNX_Chem_15_02_BF3-LA_img.jpg Lewis acids are electron acceptors , so they will not have a complete octet/ be in need of electrons to be more stable Lewis bases are electron donors, and will have a pair of electrons to share with ...
by MaggieMatern_Dis1H
Tue Nov 06, 2018 5:41 pm
Forum: Formal Charge and Oxidation Numbers
Topic: formal charge on most electronegative atom
Replies: 3
Views: 123

Re: formal charge on most electronegative atom

If the Lewis structure cannot or should not be drawn where all atoms have FC=0, then any resulting negative charges should be on the most electronegative atom in the molecule. The more electronegative an atom is, the stronger the pull it has on electrons, so it would make sense that an element like ...
by MaggieMatern_Dis1H
Tue Nov 06, 2018 5:37 pm
Forum: Bond Lengths & Energies
Topic: Resonance Structures
Replies: 4
Views: 84

Re: Resonance Structures

https://chem.libretexts.org/@api/deki/files/43158/IMG00012.GIF?revision=1 Resonance structures are characterized by the difference in location of a bond (in this picture, the double bond in the molecule NO3-). Since there is a double bond, the bond length of the N-O bonds will be shorter than that ...
by MaggieMatern_Dis1H
Tue Oct 30, 2018 10:16 pm
Forum: Ionic & Covalent Bonds
Topic: ionization energy
Replies: 7
Views: 144

Re: ionization energy

The outermost electron occupies the highest energy level, and is the furthest from the nucleus and therefore experiences the weakest attraction from the nucleus. Therefore, it takes the least amount of energy to remove this electron. An atom that has lost an electron is now a cation and now the amou...
by MaggieMatern_Dis1H
Tue Oct 30, 2018 10:08 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Energy and Stability of an Atom
Replies: 2
Views: 88

Re: Energy and Stability of an Atom

It's a kind of counter intuitive concept that is really important in biology/chemistry. Atoms and electrons are always going to favor configurations with lower energy. In the same way that electrons want to fill the lower orbitals (i.e. lower energy states) first, atoms themselves also want to have ...
by MaggieMatern_Dis1H
Tue Oct 30, 2018 10:02 pm
Forum: Ionic & Covalent Bonds
Topic: Number of Unpaired Electrons
Replies: 3
Views: 94

Re: Number of Unpaired Electrons

https://upload.wikimedia.org/wikipedia/commons/thumb/6/6b/Electron_configuration_potassium.svg/1000px-Electron_configuration_potassium.svg.png Only count the valence electrons when determining whether they are unpaired or not, as the subshells below the valence will be full and therefore every elec...
by MaggieMatern_Dis1H
Mon Oct 22, 2018 5:14 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Test Two: Electron Configuration
Replies: 6
Views: 135

Re: Test Two: Electron Configuration

Response to Lily Smith on electron spin Electron spin is the 4th quantum number denoted by ms, and it affects the magnetic field. There are only two possibilities for the 'spin' an electron can have, which are spin up and spin down. If the electron is spin up, its ms value is +1/2, and if it is spin...
by MaggieMatern_Dis1H
Mon Oct 22, 2018 5:06 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: 4s and 3d Orbitals [ENDORSED]
Replies: 3
Views: 62

Re: 4s and 3d Orbitals [ENDORSED]

https://www.google.com/url?sa=i&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwiLq4OdopveAhVsIDQIHVW2DLkQjRx6BAgBEAU&url=http%3A%2F%2Flazysupply.co%2Fdefn-orbital-diagrams.html&psig=AOvVaw1WKL3Z67CbgIj7-r6_AdGL&ust=1540339420627441 In some cases, the 4s orbital actually...
by MaggieMatern_Dis1H
Mon Oct 22, 2018 5:01 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Px. Py, Pz
Replies: 6
Views: 174

Re: Px. Py, Pz

In lecture we were determining electron configurations, and I believe he used carbon as an example. The configuration is 1s2 2s2 2px1 2py1. However, this can be written in a less specific form, which is 1s2 2s2 2p2. In this second form, it shows that there are 2 electrons in the 2p orbital, but does...
by MaggieMatern_Dis1H
Tue Oct 16, 2018 9:56 pm
Forum: Einstein Equation
Topic: Question 9; 6th edition
Replies: 3
Views: 66

Re: Question 9; 6th edition

When doing calculations that involves wavelength, e.g. , the units for should be in meters, but in conversions/final answers it usually makes more sense to represent this value in nanometers, which is why Lavelle/the solutions manual usually does so.
by MaggieMatern_Dis1H
Tue Oct 16, 2018 9:52 pm
Forum: Einstein Equation
Topic: Kinetic energy and e = hv
Replies: 3
Views: 119

Re: Kinetic energy and e = hv

You are correct in assuming that if the kinetic energy is zero, that means that the work function is equal to (E=hv), as the energy of the photon was the exact amount needed for the particular threshold. Therefore, the electron is released but has no 'leftover' energy for kinetic energy, so it has n...
by MaggieMatern_Dis1H
Tue Oct 16, 2018 9:46 pm
Forum: DeBroglie Equation
Topic: Mass of electrons
Replies: 4
Views: 116

Re: Mass of electrons

The SI unit for mass is always kg, which can be confusing for measuring objects with very small mass (like electrons). Just know that in equations, like 1/2mv^2 for kinetic energy, the mass must always be represented in kg.
by MaggieMatern_Dis1H
Fri Oct 12, 2018 4:22 pm
Forum: DeBroglie Equation
Topic: Question about diffraction patterns
Replies: 2
Views: 44

Re: Question about diffraction patterns

http://hyperphysics.phy-astr.gsu.edu/hbase/Sound/imgsou/int5.gif In constructive interference, the crests and troughs of two waves line up, and their respective amplitudes are added, making the amplitude of the new wave bigger. In destructive interference, the crests and troughs are opposite to one...
by MaggieMatern_Dis1H
Fri Oct 12, 2018 4:17 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Wavelength Worked Example from Lecture
Replies: 3
Views: 36

Re: Wavelength Worked Example from Lecture

This wavelength is not detectable because it is so small (10^-34). This is logical because when you observe a car in real life, it does not display wavelike properties. Extremely small particles, like electrons, do exhibit wavelike properties, and therefore their wavelength tends to be larger.
by MaggieMatern_Dis1H
Fri Oct 12, 2018 4:14 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Explain an example in Lecture
Replies: 3
Views: 46

Re: Explain an example in Lecture

This is because the change in energy is negative, as the electron went from a higher energy level (n=4) to a lower energy level (n=2), and therefore the difference is negative. Echange=Efinal-Einitial. The energy becomes positive in the next step however, because photons cannot have negative energy....
by MaggieMatern_Dis1H
Fri Oct 12, 2018 4:14 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Explain an example in Lecture
Replies: 3
Views: 46

Re: Explain an example in Lecture

This is because the change in energy is negative, as the electron went from a higher energy level (n=4) to a lower energy level (n=2), and therefore the difference is negative. Echange=Efinal-Einitial. The energy becomes positive in the next step however, because photons cannot have negative energy....
by MaggieMatern_Dis1H
Thu Oct 04, 2018 2:05 pm
Forum: Balancing Chemical Reactions
Topic: Balancing equations (Problem H21 6th edition)
Replies: 3
Views: 77

Re: Balancing equations (Problem H21 6th edition)

Unfortunately, there is no shortcut for balancing equations. It is important to make sure the numbers of atoms of each respective element are equal on either side. However, with practice it becomes a lot easier to recognize patterns/familiar equations and it should take you less time to do so!
by MaggieMatern_Dis1H
Thu Oct 04, 2018 2:00 pm
Forum: Molarity, Solutions, Dilutions
Topic: Atomic Weight, Molecular Weight, Formula Weight [ENDORSED]
Replies: 2
Views: 84

Re: Atomic Weight, Molecular Weight, Formula Weight [ENDORSED]

Atomic and molecular weight apply to atoms and molecules, but formula units are slightly different . They all apply to the same concept, they only differ in that atomic weight only applies to atoms (e.g. Ag) molecular weight applies to molecules (e.g. H20). Formula units are the same thing as empiri...
by MaggieMatern_Dis1H
Thu Oct 04, 2018 1:39 pm
Forum: Molarity, Solutions, Dilutions
Topic: Dilutions
Replies: 3
Views: 109

Re: Dilutions

You would need to calculate the molar masses separately as they are different compounds with different molar masses.

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