CHEMISTRY COMMUNITY

Bao Tram Nguyen

what are the important prefixes and suffixes for naming?

Bao Tram Nguyen

what are transition metals? can i get some examples as well?

Bao Tram Nguyen

How does it apply to transition metals?

Bao Tram Nguyen

Can someone briefly explain the MO theory?

Bao Tram Nguyen

In class, Professor Lavelle mentioned weak vs strong acids and bases. Can someone explain the difference between them?

Bao Tram Nguyen

How is acid rain produced chemically?

Bao Tram Nguyen

Do dipole moments affect molecular structures?

Bao Tram Nguyen

Will Dipole moments be tested on test 2 next week?

Bao Tram Nguyen

So for some homework problems, they only give you the name of the molecules and not the actual formula. Would this be the case on exams as well because I am stuck having to look up these molecules to find the formulas? Would you recommend me memorizing the prefixes that determine the number of atoms...

Bao Tram Nguyen

When a question asks for the VSEPR formula, is it asking for you to identify the number of lone and bonded electron pairs?

Bao Tram Nguyen

Is there a difference between these two shapes and if you were to put one or the other on the exam, would it affect our grade?

Bao Tram Nguyen

For part B, it asks for the number of O-S-Cl bonds and would the correct answer be 2? The solution manual does not provide an exact number.

Bao Tram Nguyen

What happens to the size of an atom as the electronegativity increases and decreases? Does it actually effect atom size?

Bao Tram Nguyen

Is electron negativity and electron affinity the same thing? And which direction does it increase on the periodic table?

Bao Tram Nguyen

Can someone clarify what a dipole moment is? I know it has to do with the polarity of the atoms in a molecule but please clarify for me thanks

Bao Tram Nguyen

What is the difference between a regular vs a coordinate covalent bond and how do you show that it's a coordinate bond?

Bao Tram Nguyen

When a question asks you to draw the resonance structure for the molecule, does that mean you have to draw every possibility of the bonds? What are you suppose to do?

Bao Tram Nguyen

What is the difference between these two bonds and why are they significant?

Bao Tram Nguyen

I would say not to use this equation because he doesn’t like it. Instead use: E= ((-hR)/(n2)^2)-((-hR)/(n1)^2) and then get whatever you’re looking for alone. However this will only work for the Hydrogen atom so read the question carefully before starting. Hope this helps (:

Bao Tram Nguyen

So in class on friday we talked about how to draw a structure for CH5 and it looked like a pentagon with a circle inside it. Would count as a lewis structure or what would you call it?

Bao Tram Nguyen

You can basically put them anywhere as long as they satisfy the octet rule (there are some elements that are exceptions to this because they have an expanded octet) meaning they have 8 valence electrons in the outer most shell after bonding with other atoms

Bao Tram Nguyen

When does a substance have resonance?

Bao Tram Nguyen

If the element has an empty d orbital, then it can expand, which causes it to have more than 8 electrons in the valence shell. These elements can be found in the 3rd period of the p block

Bao Tram Nguyen

The first bond will always be a sigma bond and any bond after will be a pi bond

Bao Tram Nguyen

I know that the octet rule is important when drawing a lewis structure but is it always necessary to draw the dots for the electrons on each element or can it be inferred that it fulfills the octet rule?

Bao Tram Nguyen

Can anyone explain the answer to me? I have no idea what to say. Is it because the lines are around the same energy level for the electrons?

Bao Tram Nguyen

so someone told me that the electrons travel on or follow the wavelength. can someone clarify if that's true or not?

Bao Tram Nguyen

does the amplitude of a wavelength ever come into play? is it something that's important and in which cases?

Bao Tram Nguyen

what is the relationship between the frequency and the wavelength? is frequency the number of wave cycles per second and wavelength is basically the distance of each cycle?

Bao Tram Nguyen

What happens to the kinetic energy in Ek=(1/2)Me-Ve-^2 if we were to increase the frequency or intensity of the electrons? Or when does the kinetic energy change, if it changes at all.

Bao Tram Nguyen

In real life, yes, the temperature will determine if the reaction goes to completion. If the temperature doesn’t reach the point that you need it to be for the reaction to work then some compounds might not react to what you add in the solution.

Bao Tram Nguyen

First balance the hydrogen atoms in the reaction: 2 NH3 + O2 —> 3 H2O + NO2 Then balance the nitrogens: 2 NH3 + O2 —> 3 H2O + 2 NO2 And lastly, balance the oxygens. You never want to balance it first because you don’t want to balance an element that is alone. It will be harder to work around the oth...

Bao Tram Nguyen

Shouldn’t it be .100L because of sig figs instead of .1L?

Bao Tram Nguyen

What a good question! This is where significant figures come into play. When you write 30 g, you are only allowed to use 2 significant figures to answer the question versus 30.0 g which allows you to write 3 sig figs. Also writing 30.0 g makes the measurement more precise and shows you that it is ex...

Bao Tram Nguyen

Personally I think it’s easier to just write g/mol instead of g*mol^-1. But it’s good to know both ways because not everyone writes it like that.

CHEMISTRY COMMUNITY

Search found 35 matches

Prefixes and Suffixes

Transition metals

MO Theory

Molecular Orbital Theory

Weak vs. Strong

Formation of Acid Rain

Molecular Structure

Test 2

Prefixes

VSEPR Formula

Trigonal Pyramid vs Trigonal Planar

2E.7

Atom size

Electron affinity

Dipole moments

Coordinate covalent bonds

Drawing Resonance Structures

Sigma vs Pi

Re: Rydberg Equation

Drawing the structure

Re: Double bond placement

Resonance

Re: Exceptions

Re: Sigma vs. Pi

Drawing Lewis Structure

Help with 1A. 11

where does it travel

Wavelength

Frequency vs. Wavelength

Kinetic Energy

Re: Temperature Effect on Reactions

Re: Homework H.7

Re: Homework Question G13

Re: Sig figs

Re: The units for Frequency