Search found 30 matches
- Sun Dec 09, 2018 9:14 pm
- Forum: Amphoteric Compounds
- Topic: Amphiprotic vs Amphoteric
- Replies: 2
- Views: 518
Amphiprotic vs Amphoteric
What are some comparisons between amphiprotic and amphoteric molecules? Are there certain characteristics of each type?
- Sun Dec 09, 2018 9:02 pm
- Forum: Bond Lengths & Energies
- Topic: Intermolecular forces
- Replies: 3
- Views: 815
Intermolecular forces
Do intermolecular forces have any effect on bond length? If so, what is the effect?
- Sun Dec 09, 2018 8:52 pm
- Forum: Naming
- Topic: Ates, Ides, Etc.
- Replies: 1
- Views: 514
Ates, Ides, Etc.
How do we know when to use -ate vs -ide when naming a metal?
- Mon Dec 03, 2018 7:59 pm
- Forum: Air Pollution & Acid Rain
- Topic: Basic Rain
- Replies: 5
- Views: 795
Basic Rain
Is it possible, given the proper scenario, for basic rain to occur?
- Mon Dec 03, 2018 7:58 pm
- Forum: Air Pollution & Acid Rain
- Topic: ACID RAIN
- Replies: 5
- Views: 848
Re: ACID RAIN
Acid rain is more acidic in terms of molality (you spelled it morality, which is indeed a quite different term), but it is also harmful because a sudden increase in acidity, even in small amounts, can disrupt the equilibrium, which is harmful to wildlife.
- Mon Dec 03, 2018 5:50 pm
- Forum: Properties & Structures of Inorganic & Organic Acids
- Topic: DNA
- Replies: 1
- Views: 259
DNA
DNA stands for deoxyribonucleic acid. Is DNA a Lewis acid or a Bronsted acid?
- Mon Nov 26, 2018 10:34 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Lone pair electrons affecting shape
- Replies: 2
- Views: 288
Re: Lone pair electrons affecting shape
Building off of the previous reply, bond angles need to be maximized because of electron repulsion. Since electrons have the same charge, they tend to repel away from each other, creating the largest bond angle possible.
- Mon Nov 26, 2018 10:29 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Sigma and Pi Bonds
- Replies: 3
- Views: 345
Re: Sigma and Pi Bonds
Since sigma bonds have one point of connectivity between two atoms, these atoms are allowed to freely rotate. If a pi bond forms, there would be two points of contact between atoms, preventing the atoms from rotating.
- Mon Nov 26, 2018 10:18 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Radicals
- Replies: 4
- Views: 493
Re: Radicals
The single electron in a radical has enough charge to influence the position of the other orbitals in the molecule.
- Sat Nov 17, 2018 7:25 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond angles
- Replies: 5
- Views: 453
Re: Bond angles
We are supposed to know the angles based on a rough guideline for each shape, but for certain cases, such as molecules with lone pair electrons, we are to estimate if the bond angle is greater than or less than the "standard" angle for the shape.
- Sat Nov 17, 2018 7:21 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 16
- Views: 1245
Re: Bond Angles
The questions will likely ask us to estimate the bond angles, in which case we would take into account the positioning of the lone pair electrons. Depending on where the lone pair electrons are, we can estimate if the bond angle is greater than or less than the standard shape's angle.
- Sat Nov 17, 2018 7:17 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: 2E.29
- Replies: 2
- Views: 270
Re: 2E.29
Drawing the lewis structure is good as a first step to solving the problem because it allows you to visualize the possible positions for the atoms and lone pair electrons.
- Sun Nov 11, 2018 11:54 pm
- Forum: Electronegativity
- Topic: Electronegativity Graph
- Replies: 4
- Views: 476
Electronegativity Graph
Hi all,
I found a graph showing the individual electronegativities of each element and I think it would be useful for all of you to see. You can visualize the trends and their exceptions by reading the graph.
I found a graph showing the individual electronegativities of each element and I think it would be useful for all of you to see. You can visualize the trends and their exceptions by reading the graph.
- Sun Nov 11, 2018 11:36 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Formal charge on central atom
- Replies: 5
- Views: 1124
Re: Formal charge on central atom
In nature, multiple structures exist, as do resonance structures. To my understanding, by drawing the most stable structure, we are illustrating the patterns most likely to exist at any given time.
- Sun Nov 11, 2018 11:25 pm
- Forum: Industrial Examples
- Topic: Favorite Industrial Example
- Replies: 3
- Views: 1141
Favorite Industrial Example
Hi all,
I am curious to hear about industrial examples of coordination compounds and how they are applied. If any of you have examples you see from your life or work, I'd love to hear below. Please share!
I am curious to hear about industrial examples of coordination compounds and how they are applied. If any of you have examples you see from your life or work, I'd love to hear below. Please share!
- Fri Nov 02, 2018 11:13 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic and Covalent bonds with covalent/ionic characteristics
- Replies: 3
- Views: 336
Re: Ionic and Covalent bonds with covalent/ionic characteristics
When the electronegativity difference is between .4 and 2, we cannot confidently say if the bond is covalent or ionic. These bonds are usually ionic with covalent character or vise versa.
- Fri Nov 02, 2018 10:58 pm
- Forum: Ionic & Covalent Bonds
- Topic: Highly Distorted Electrons?
- Replies: 3
- Views: 307
Re: Highly Distorted Electrons?
The same effect causes some ionic bonds to have covalent character and some covalent bonds to have ionic character.
- Fri Nov 02, 2018 10:42 pm
- Forum: Lewis Structures
- Topic: Radicals
- Replies: 3
- Views: 437
Re: Radicals
Radicals are atoms, molecules, and ions that have one unpaired valence electron. Because of their unpaired electron, radicals are usually very reactive and do not last long in nature. You would know if it is a radical by looking at their valence electrons and how they differ from their stable state.
- Sun Oct 28, 2018 9:54 pm
- Forum: Ionic & Covalent Bonds
- Topic: bound atoms
- Replies: 8
- Views: 1263
Re: bound atoms
Additionally, since bound atoms are more stable, certain bonded molecules are found more often in nature than their single-atom element. For example, oxygen is commonly seen as O2 rather than just O.
- Sun Oct 28, 2018 9:43 pm
- Forum: Ionic & Covalent Bonds
- Topic: Unit of Atomic Radius
- Replies: 4
- Views: 392
Re: Unit of Atomic Radius
An angstrom is commonly used because it is easy to understand relative to the radius of a hydrogen atom. A hydrogen atom is approximately half of an angstrom.
- Sun Oct 21, 2018 11:23 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Labeling Electron Orbitals
- Replies: 5
- Views: 812
Re: Labeling Electron Orbitals
The spin does not matter unless there are two electrons in the same "address" (n,l,ml). Since direction (counterclockwise/clockwise,up/down) is relative to how the atom is being viewed, it does not matter which electron is labeled +1/2 or -1/2.
- Sun Oct 21, 2018 10:58 pm
- Forum: *Black Body Radiation
- Topic: Black Body
- Replies: 10
- Views: 1365
Re: Black Body
The sun is an example of an "almost" black body (since true black bodies do no exist) because it emits almost every wavelength of light.
- Sun Oct 21, 2018 10:56 pm
- Forum: Photoelectric Effect
- Topic: Visible Light Spectrum
- Replies: 6
- Views: 558
Re: Visible Light Spectrum
Visible light spectrum differs from person to person based on their individual ability to see. But generally speaking, 400-700nm is about right.
- Sun Oct 14, 2018 10:47 pm
- Forum: Photoelectric Effect
- Topic: Electrons Lost
- Replies: 3
- Views: 371
Re: Electrons Lost
In response to the comment about metal being a circuit; the circuit only exists in the model set up in this particular experiment. In "nature", it is possible for a metal to lose its electrons due to the photoelectric effect. Should a metal lose enough electrons on the atomic scale, it wou...
- Sun Oct 14, 2018 10:41 pm
- Forum: Properties of Electrons
- Topic: Free vs. Bound Electrons
- Replies: 6
- Views: 6024
Re: Free vs. Bound Electrons
It may also be important to note that in some cases, like metals, electrons can be free in the sense that they are not bound to any one specific atom, but rather exist as a sea of communication in between existing atoms. For example, when electricity runs through a wire, electrons are free to rush a...
- Sun Oct 14, 2018 10:33 pm
- Forum: Properties of Light
- Topic: Units for Wavelength
- Replies: 7
- Views: 709
Re: Units for Wavelength
Wavelengths, like any other measurable factor, can be understood in terms of any si unit of length, though some units are easier to understand intuitively than others. For example, it would make more sense to measure radio waves as m and visible light waves as nm because each wavelength is expressed...
- Thu Oct 04, 2018 11:36 pm
- Forum: Limiting Reactant Calculations
- Topic: Combustion Analysis? [ENDORSED]
- Replies: 7
- Views: 451
Re: Combustion Analysis? [ENDORSED]
If I'm not mistake, oxidation reactions don't necessarily always release energy. I think Dr. Lavelle mentioned some oxidation reactions that are endothermic.
- Thu Oct 04, 2018 11:24 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: % Yield
- Replies: 8
- Views: 1626
% Yield
When performing an experiment in the lab, is there a cutoff for acceptable % yield? What is considered "efficient"?
- Thu Oct 04, 2018 11:20 pm
- Forum: Limiting Reactant Calculations
- Topic: Aqueous Products in Limiting Reactant Problems
- Replies: 3
- Views: 188
Re: Aqueous Products in Limiting Reactant Problems
Sure. What is the limiting reactant when 100g H20 (water) reacts with 100g CaC2?
The equation looks like CaC2(s)+2H20(l)->Ca(OH)2(aq)+C2H2(g)
The equation looks like CaC2(s)+2H20(l)->Ca(OH)2(aq)+C2H2(g)
- Thu Oct 04, 2018 11:06 pm
- Forum: Limiting Reactant Calculations
- Topic: Aqueous Products in Limiting Reactant Problems
- Replies: 3
- Views: 188
Aqueous Products in Limiting Reactant Problems
When asked to find the limiting reactant and given a question in which the reactants are made up of an element/compound + water and yields at least one aqueous product, are we able to assume that the limiting reactant is the element/compound besides water? Since the aqueous product is found in water...