Search found 30 matches

by Jeremy Feng 1A
Sun Dec 09, 2018 9:14 pm
Forum: Amphoteric Compounds
Topic: Amphiprotic vs Amphoteric
Replies: 2
Views: 135

Amphiprotic vs Amphoteric

What are some comparisons between amphiprotic and amphoteric molecules? Are there certain characteristics of each type?
by Jeremy Feng 1A
Sun Dec 09, 2018 9:02 pm
Forum: Bond Lengths & Energies
Topic: Intermolecular forces
Replies: 1
Views: 201

Intermolecular forces

Do intermolecular forces have any effect on bond length? If so, what is the effect?
by Jeremy Feng 1A
Sun Dec 09, 2018 8:52 pm
Forum: Naming
Topic: Ates, Ides, Etc.
Replies: 1
Views: 131

Ates, Ides, Etc.

How do we know when to use -ate vs -ide when naming a metal?
by Jeremy Feng 1A
Mon Dec 03, 2018 7:59 pm
Forum: Air Pollution & Acid Rain
Topic: Basic Rain
Replies: 5
Views: 171

Basic Rain

Is it possible, given the proper scenario, for basic rain to occur?
by Jeremy Feng 1A
Mon Dec 03, 2018 7:58 pm
Forum: Air Pollution & Acid Rain
Topic: ACID RAIN
Replies: 5
Views: 325

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.
by Jeremy Feng 1A
Mon Dec 03, 2018 5:50 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: DNA
Replies: 1
Views: 61

DNA

DNA stands for deoxyribonucleic acid. Is DNA a Lewis acid or a Bronsted acid?
by Jeremy Feng 1A
Mon Nov 26, 2018 10:34 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Lone pair electrons affecting shape
Replies: 2
Views: 47

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.
by Jeremy Feng 1A
Mon Nov 26, 2018 10:29 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Sigma and Pi Bonds
Replies: 3
Views: 74

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.
by Jeremy Feng 1A
Mon Nov 26, 2018 10:18 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Radicals
Replies: 4
Views: 81

Re: Radicals

The single electron in a radical has enough charge to influence the position of the other orbitals in the molecule.
by Jeremy Feng 1A
Sat Nov 17, 2018 7:25 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angles
Replies: 5
Views: 71

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.
by Jeremy Feng 1A
Sat Nov 17, 2018 7:21 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 16
Views: 215

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.
by Jeremy Feng 1A
Sat Nov 17, 2018 7:17 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.29
Replies: 2
Views: 42

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.
by Jeremy Feng 1A
Sun Nov 11, 2018 11:54 pm
Forum: Electronegativity
Topic: Electronegativity Graph
Replies: 4
Views: 136

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.
by Jeremy Feng 1A
Sun Nov 11, 2018 11:36 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Formal charge on central atom
Replies: 5
Views: 244

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.
by Jeremy Feng 1A
Sun Nov 11, 2018 11:25 pm
Forum: Industrial Examples
Topic: Favorite Industrial Example
Replies: 1
Views: 220

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!
by Jeremy Feng 1A
Fri Nov 02, 2018 11:13 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic and Covalent bonds with covalent/ionic characteristics
Replies: 3
Views: 51

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.
by Jeremy Feng 1A
Fri Nov 02, 2018 10:58 pm
Forum: Ionic & Covalent Bonds
Topic: Highly Distorted Electrons?
Replies: 3
Views: 45

Re: Highly Distorted Electrons?

The same effect causes some ionic bonds to have covalent character and some covalent bonds to have ionic character.
by Jeremy Feng 1A
Fri Nov 02, 2018 10:42 pm
Forum: Lewis Structures
Topic: Radicals
Replies: 3
Views: 61

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.
by Jeremy Feng 1A
Sun Oct 28, 2018 9:54 pm
Forum: Ionic & Covalent Bonds
Topic: bound atoms
Replies: 8
Views: 130

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.
by Jeremy Feng 1A
Sun Oct 28, 2018 9:43 pm
Forum: Ionic & Covalent Bonds
Topic: Unit of Atomic Radius
Replies: 4
Views: 65

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.
by Jeremy Feng 1A
Sun Oct 21, 2018 11:23 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Labeling Electron Orbitals
Replies: 5
Views: 133

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.
by Jeremy Feng 1A
Sun Oct 21, 2018 10:58 pm
Forum: *Black Body Radiation
Topic: Black Body
Replies: 9
Views: 363

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.
by Jeremy Feng 1A
Sun Oct 21, 2018 10:56 pm
Forum: Photoelectric Effect
Topic: Visible Light Spectrum
Replies: 6
Views: 72

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.
by Jeremy Feng 1A
Sun Oct 14, 2018 10:47 pm
Forum: Photoelectric Effect
Topic: Electrons Lost
Replies: 3
Views: 80

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...
by Jeremy Feng 1A
Sun Oct 14, 2018 10:41 pm
Forum: Properties of Electrons
Topic: Free vs. Bound Electrons
Replies: 6
Views: 127

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...
by Jeremy Feng 1A
Sun Oct 14, 2018 10:33 pm
Forum: Properties of Light
Topic: Units for Wavelength
Replies: 7
Views: 95

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...
by Jeremy Feng 1A
Thu Oct 04, 2018 11:36 pm
Forum: Limiting Reactant Calculations
Topic: Combustion Analysis? [ENDORSED]
Replies: 7
Views: 150

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.
by Jeremy Feng 1A
Thu Oct 04, 2018 11:24 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: % Yield
Replies: 8
Views: 346

% Yield

When performing an experiment in the lab, is there a cutoff for acceptable % yield? What is considered "efficient"?
by Jeremy Feng 1A
Thu Oct 04, 2018 11:20 pm
Forum: Limiting Reactant Calculations
Topic: Aqueous Products in Limiting Reactant Problems
Replies: 3
Views: 61

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)
by Jeremy Feng 1A
Thu Oct 04, 2018 11:06 pm
Forum: Limiting Reactant Calculations
Topic: Aqueous Products in Limiting Reactant Problems
Replies: 3
Views: 61

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...

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