CHEMISTRY COMMUNITY

Merin Padayatty 3G

Bent and angular are the same shape.

Merin Padayatty 3G

A bent shape can have either one lone pair or two lone pairs depending on their electron geometry.

Merin Padayatty 3G

Cis molecules are polar whereas trans molecules are nonpolar.

Merin Padayatty 3G

You would add an -ate to the end of metal when the overall charge of the coordination complex is negative.

Merin Padayatty 3G

When the coordination compund has an overall negative charge, you would use ferrate instead of iron as the metals in a negative coordination complex end in
-ate.

Merin Padayatty 3G

The the coordination complex has an overall negative charge, you would use ferrate instead of iron and cuprate instead of copper.

Merin Padayatty 3G

When the ligand already has a prefix, including polydentate ligands, you would use those prefixes.

Merin Padayatty 3G

The formal charge of a resonance structure should be equal to the atom's overall charge.

Merin Padayatty 3G

A quick way to calculate formal charge is to count subtract the sum of the number of lone electrons and bonds by the number of valence electrons.

Merin Padayatty 3G

Induced dipole-induced dipole forces are the weakest intermolecular force and occur between nonpolar molecules.

Merin Padayatty 3G

Sigma bonds are stronger than pi bonds because the atomic orbitals forming sigma bonds overlap to a greater extent than the orbitals forming pi bonds.

Merin Padayatty 3G

The next favorable bond would be ion-dipole.

Merin Padayatty 3G

I write the calculations on the side and write the final answer next to each atom.

Merin Padayatty 3G

The exact bond length is derived from experiments, but relative bond lengths can be determined from bond order.

Merin Padayatty 3G

The periodic table provides a general trend of electronegativity, and you can determine whether a molecule has a dipole moment and is polar from the shape using the VSEPR model.

Merin Padayatty 3G

Yes, an H atom has to bond with an N, O, or F atom to be considered as a hydrogen bond.

Merin Padayatty 3G

Sigma bonds allow for rotation whereas pi bonds do not. However, single, double, and triple bonds are all considered as only one region of electron density.

Merin Padayatty 3G

Bent and angular are synonymous, but the textbook uses the term "angular."

Merin Padayatty 3G

When a molecule has 4 bonding pairs and 1 lone pair, the shape is seesaw.

Merin Padayatty 3G

The actual shape of the molecule is dependent on the bonding electron pairs.

Merin Padayatty 3G

You should know the general periodic table trend for electronegativity because it's relevant when drawing Lewis structures.

Merin Padayatty 3G

VSEPR stands for "valence shell electron pair repulsion" and we don't need to have the acronym memorized.

Merin Padayatty 3G

A higher difference in electronegativity results in a polar molecule.

Merin Padayatty 3G

Smaller cations with a larger effective nuclear charge have a higher polarizing power whereas larger anions are have a higher polarizability.

Merin Padayatty 3G

Test 2 covers what we learn after the midterm.

Merin Padayatty 3G

Electronegativity increases up the group and across a period.

Merin Padayatty 3G

All elements in period 3 and after can have an expanded octet.

Merin Padayatty 3G

The number of valence electrons is determined by the group number.

Merin Padayatty 3G

Why can d orbitals carry extra electrons?

Merin Padayatty 3G

The Angstrom is the unit that describes bond length. A double bond has a shorter bond length than a single bond.

Merin Padayatty 3G

How should we take account of electronegativity when drawing Lewis structures?

Merin Padayatty 3G

All tests and midterms have to written in pen.

Merin Padayatty 3G

Another difference between cations and anions is that cations are usually smaller than their parent atom and anions are usually larger than their parent atom.

Merin Padayatty 3G

Yes, knowing the blocks is very beneficial when writing out electron configurations.

Merin Padayatty 3G

Will the midterm cover the chemical bond section?

Merin Padayatty 3G

I like watching Khan Academy and Organic Chemistry both to reinforce and clarify certain topics!

Merin Padayatty 3G

As of right now, the modules cover Week 1 and 2 material.

Merin Padayatty 3G

After going to lecture, I like to immediately read the material covered in the textbook to solidify the concepts. I also try to do the corresponding homework problems right away and I'll go to TA hours if I'm confused about anything.

Merin Padayatty 3G

An angstrom is equivalent to 1*10^(-10) meters and is usually used to measure bond length.

Merin Padayatty 3G

With this particle equation, E represents the energy of the photon.

Merin Padayatty 3G

The Balmer series applies to the visible light region and the Lyman series applies to the UV region of the spectrum.

Merin Padayatty 3G

Although Test 1 contained all the unit conversions needed, I believe it will be safer and easier to memorize the main conversions especially for the midterm.

Merin Padayatty 3G

We'll most likely get our tests back during our next discussion.

Merin Padayatty 3G

Frequency and wavelength have an inverse relationship as when the frequency increases, the wavelength decreases and vice versa.

Merin Padayatty 3G

I think we're only supposed to turn in problems from the quantum section this week.

Merin Padayatty 3G

The speed of light is a constant as it doesn't change.

Merin Padayatty 3G

What should you do if no one laughs at your chemistry jokes?
Keep telling them until you get a reaction.

Merin Padayatty 3G

I personally find reading the textbook very beneficial just so I can go in depth on the topics covered. I usually have to read the text more than once to really comprehend the material so I break the text into small sections.

Merin Padayatty 3G

Chemical reactions have to be balanced in order to satisfy the law of conservation of matter which states that matter is neither created nor destroyed in a closed system. Therefore, the amount of element in the reactant and poduct sides have to be equal.

Merin Padayatty 3G

I would say to use the entire number given on the periodic table and then to round your final answer based on the rules of sig figs.

Merin Padayatty 3G

It was super inspiring and motivating to hear your experience as a medical student! As a first year premed, I'm wondering how you were able to balance your social and academic life?

Merin Padayatty 3G

One of the most helpful things I've learned over the past couple years on how to ease jitters before exams is to not discuss the content or try to cram in last minute material right before taking the test. Instead, I like to take deep breathes in order to calm myself down and get myself in the right...

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