CHEMISTRY COMMUNITY

Ziana Bhanji 1E

Coordination number, also called Ligancy, the number of atoms, ions, or molecules that a central atom or ion holds

Ziana Bhanji 1E

I'm pretty sure sig figs matter in the final. Here is a helpful video
https://www.khanacademy.org/math/arithm ... nt-figures

Ziana Bhanji 1E

Yes, it is the same thing

Ziana Bhanji 1E

Acid solutions contain hydrogen ions. The higher the concentration of hydrogen ions, the lower the pH. A strong acid also completely dissociates in water.

Ziana Bhanji 1E

Also remember that a sigma bond is the strongest type of covalent chemical bond.

Ziana Bhanji 1E

Also remember that the van der Waals dispersion forces between the molecules will be identical in both cases

Ziana Bhanji 1E

They must contain at least one pair of nonbonding electrons that can be donated to a metal ion.

Ziana Bhanji 1E

I think that the degree of bond angles have been found experimentally, and therefore we need to be able to look at the molecule and determine the bond angles based on the info that we have been taught.

Ziana Bhanji 1E

The London dispersion force is the weakest intermolecular force that there is. It is a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles.

Ziana Bhanji 1E

My TA also told us that we are not expected to know how to write out names of compounds.

Ziana Bhanji 1E

We know that bases donate pairs of electrons and acids accept pairs of electrons. A Lewis acid is therefore any substance, such as the H+ ion, that can accept a pair of nonbonding electrons. In other words, a Lewis acid is an electron-pair acceptor. I found this video quite explanatory: https://www....

Ziana Bhanji 1E

An oxidation number is a number assigned to an element in chemical combination. It represents the number of electrons lost/gained by an atom of that element in the compound. https://www.khanacademy.org/science/chemistry/oxidation-reduction/redox-oxidation-reduction/v/practice-determining-oxidation-s...

Ziana Bhanji 1E

I tend to use lines too because my high school Chemistry teacher said it was the same thing as drawing two dots, but you should double check with your TA just incase.

Ziana Bhanji 1E

From what I understand, I also think they are the same thing, which is the charge assigned to an atom or molecule.

Ziana Bhanji 1E

I find it easy to just look at the group that the element is in. This video provides a helpful explanation
https://www.khanacademy.org/science/che ... -electrons

Ziana Bhanji 1E

The ionisation energy is defined as the energy required to remove an electron from an atom (gas phase). Ionisation energy generally increases on going across a period. This is because on crossing a period, more protons are being added to the nuclei of the atoms. This results in an increase in nuclea...

Ziana Bhanji 1E

Cations are positive and anions are negative. I know a weird way that helps me remember the charges.

Cations:
Cats have paws. Therefore, [cat]ions are [paw]sitive

I hope that makes sense^.

Ziana Bhanji 1E

Could someone please explain why Z=2 and why the solution manual directly calculates the frequency and not the energy.

Ziana Bhanji 1E

This website has an explanation and is really helpful:

https://www.angelo.edu/faculty/kboudrea ... umbers.htm

Ziana Bhanji 1E

I think it would be correct, but make sure to ask your TA maybe.

Ziana Bhanji 1E

This site was helped me understand the concept:
https://chem.libretexts.org/Core/Physic ... ctron_Spin

Ziana Bhanji 1E

My TA said it was around 22/40.

Ziana Bhanji 1E

Equations are given to us, but I personally find it easier and easier to memorize the equations by doing more problems. It'll come to you naturally then.

Ziana Bhanji 1E

Yes, I agree. It has to be greater than or equal to the threshold energy

Ziana Bhanji 1E

Steps to remember: -Balance the chemical equation for the chemical reaction. -Convert the given information into moles. -Use stoichiometry for each individual reactant to find the mass of product produced. -The reactant that produces a lesser amount of product is the limiting reagent. -The reactant ...

Ziana Bhanji 1E

Yes, because the question asks for the amount of Ca2+ ions (in moles).

Ziana Bhanji 1E

Once you identify your limiting reactant, you calculate how much of the other reactant it must have reacted with and subtract from the original amount. Here's a website that might help. It has a video explanation too: https://socratic.org/questions/how-do-you-determine-how-much-of-the-excess-reactan...

Ziana Bhanji 1E

This confuses me too! I found a helpful video that might be good for you to take a look at though:
https://www.khanacademy.org/math/arithm ... nt-figures

Ziana Bhanji 1E

Yeah I agree, I don't think it matters. I usually use "mol" just cause it's the shortest but I've seen all being used.

Ziana Bhanji 1E

In addition, these tips might also help: 1. Start by counting and making note of all of the elements present on each side of the equation. 2. Count the number of molecules of each element on both sides of the equation before starting to balance them. 3. Look for atoms that make up a group or family ...

CHEMISTRY COMMUNITY

Search found 30 matches

Re: Coordination number [ENDORSED]

Re: Sig Figs for Final

Re: Bent/angular [ENDORSED]

Re: Strong Acid

Re: σ bonds

Re: cis and trans

Re: Ligands

Re: Bond angle

Re: London Forces

Re: Chemical Formula Name

Re: Lewis acid vs. base

Re: Oxidation numbers

Re: Dots or lines [ENDORSED]

Re: Formal Energy / Formal Charge [ENDORSED]

Re: VALENCE ELECTRONS [ENDORSED]

Re: Ionisation energy

Re: cation vs anion

Textbook question 1.17

Re: Quantum Number

Re: Electron Configuration of Br-

Re: What does electron spin actually mean? [ENDORSED]

Re: Test Number 1

Re: Memorizing formulas test 2

Re: Photoelectric Effect

Re: Limiting reagent of NH(3) +CuO------->N(2)+H2O+CO

Re: Chemistry Review Section E

Re: Finding Excess Reactant [ENDORSED]

Re: Significant Figures When Multiplying and Dividing [ENDORSED]

Re: Moles mols mol? [ENDORSED]

Re: Suggestions for Balancing Reactions