Search found 30 matches

by Ziana Bhanji 1E
Sun Jun 10, 2018 11:47 pm
Forum: Polyprotic Acids & Bases
Topic: Coordination number [ENDORSED]
Replies: 3
Views: 507

Re: Coordination number [ENDORSED]

Coordination number, also called Ligancy, the number of atoms, ions, or molecules that a central atom or ion holds
by Ziana Bhanji 1E
Sun Jun 10, 2018 11:45 pm
Forum: SI Units, Unit Conversions
Topic: Sig Figs for Final
Replies: 8
Views: 338

Re: Sig Figs for Final

I'm pretty sure sig figs matter in the final. Here is a helpful video
https://www.khanacademy.org/math/arithm ... nt-figures
by Ziana Bhanji 1E
Sun Jun 10, 2018 11:43 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent/angular [ENDORSED]
Replies: 5
Views: 150

Re: Bent/angular [ENDORSED]

Yes, it is the same thing
by Ziana Bhanji 1E
Sun Jun 10, 2018 11:42 pm
Forum: Lewis Acids & Bases
Topic: Strong Acid
Replies: 8
Views: 332

Re: Strong Acid

Acid solutions contain hydrogen ions. The higher the concentration of hydrogen ions, the lower the pH. A strong acid also completely dissociates in water.
by Ziana Bhanji 1E
Sun Jun 03, 2018 2:47 pm
Forum: Hybridization
Topic: σ bonds
Replies: 9
Views: 236

Re: σ bonds

Also remember that a sigma bond is the strongest type of covalent chemical bond.
by Ziana Bhanji 1E
Sun Jun 03, 2018 2:46 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: cis and trans
Replies: 7
Views: 189

Re: cis and trans

Also remember that the van der Waals dispersion forces between the molecules will be identical in both cases
by Ziana Bhanji 1E
Sun Jun 03, 2018 2:45 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligands
Replies: 8
Views: 242

Re: Ligands

They must contain at least one pair of nonbonding electrons that can be donated to a metal ion.
by Ziana Bhanji 1E
Mon May 28, 2018 9:56 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond angle
Replies: 9
Views: 204

Re: Bond angle

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.
by Ziana Bhanji 1E
Mon May 28, 2018 9:50 pm
Forum: Dipole Moments
Topic: London Forces
Replies: 7
Views: 267

Re: London Forces

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.
by Ziana Bhanji 1E
Sun May 20, 2018 10:52 pm
Forum: Lewis Structures
Topic: Chemical Formula Name
Replies: 3
Views: 113

Re: Chemical Formula Name

My TA also told us that we are not expected to know how to write out names of compounds.
by Ziana Bhanji 1E
Sun May 20, 2018 10:49 pm
Forum: Lewis Acids & Bases
Topic: Lewis acid vs. base
Replies: 5
Views: 166

Re: Lewis acid vs. base

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....
by Ziana Bhanji 1E
Sun May 20, 2018 10:43 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Oxidation numbers
Replies: 4
Views: 213

Re: Oxidation numbers

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...
by Ziana Bhanji 1E
Mon May 14, 2018 2:04 am
Forum: Lewis Structures
Topic: Dots or lines [ENDORSED]
Replies: 5
Views: 165

Re: Dots or lines [ENDORSED]

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.
by Ziana Bhanji 1E
Mon May 14, 2018 2:02 am
Forum: Lewis Structures
Topic: Formal Energy / Formal Charge [ENDORSED]
Replies: 2
Views: 125

Re: Formal Energy / Formal Charge [ENDORSED]

From what I understand, I also think they are the same thing, which is the charge assigned to an atom or molecule.
by Ziana Bhanji 1E
Mon May 14, 2018 1:59 am
Forum: Ionic & Covalent Bonds
Topic: VALENCE ELECTRONS [ENDORSED]
Replies: 16
Views: 438

Re: VALENCE ELECTRONS [ENDORSED]

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
by Ziana Bhanji 1E
Sun May 06, 2018 4:16 pm
Forum: Trends in The Periodic Table
Topic: Ionisation energy
Replies: 1
Views: 64

Re: Ionisation energy

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...
by Ziana Bhanji 1E
Sun May 06, 2018 4:12 pm
Forum: Ionic & Covalent Bonds
Topic: cation vs anion
Replies: 14
Views: 424

Re: cation vs anion

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^.
by Ziana Bhanji 1E
Sun May 06, 2018 4:03 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Textbook question 1.17
Replies: 1
Views: 110

Textbook question 1.17

Could someone please explain why Z=2 and why the solution manual directly calculates the frequency and not the energy.
by Ziana Bhanji 1E
Sun Apr 29, 2018 6:20 pm
Forum: Quantum Numbers and The H-Atom
Topic: Quantum Number
Replies: 3
Views: 130

Re: Quantum Number

This website has an explanation and is really helpful:

https://www.angelo.edu/faculty/kboudrea ... umbers.htm
by Ziana Bhanji 1E
Sun Apr 29, 2018 6:17 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Electron Configuration of Br-
Replies: 6
Views: 1989

Re: Electron Configuration of Br-

I think it would be correct, but make sure to ask your TA maybe.
by Ziana Bhanji 1E
Sun Apr 22, 2018 10:33 pm
Forum: Administrative Questions and Class Announcements
Topic: Test Number 1
Replies: 10
Views: 431

Re: Test Number 1

My TA said it was around 22/40.
by Ziana Bhanji 1E
Sun Apr 22, 2018 10:32 pm
Forum: Properties of Light
Topic: Memorizing formulas test 2
Replies: 16
Views: 534

Re: Memorizing formulas test 2

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.
by Ziana Bhanji 1E
Sun Apr 22, 2018 10:28 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect
Replies: 12
Views: 366

Re: Photoelectric Effect

Yes, I agree. It has to be greater than or equal to the threshold energy
by Ziana Bhanji 1E
Sun Apr 15, 2018 3:37 pm
Forum: Limiting Reactant Calculations
Topic: Limiting reagent of NH(3) +CuO------->N(2)+H2O+CO
Replies: 3
Views: 221

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

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 ...
by Ziana Bhanji 1E
Sun Apr 15, 2018 3:11 pm
Forum: SI Units, Unit Conversions
Topic: Chemistry Review Section E
Replies: 4
Views: 166

Re: Chemistry Review Section E

Yes, because the question asks for the amount of Ca2+ ions (in moles).
by Ziana Bhanji 1E
Sun Apr 15, 2018 3:00 pm
Forum: Limiting Reactant Calculations
Topic: Finding Excess Reactant [ENDORSED]
Replies: 2
Views: 483

Re: Finding Excess Reactant [ENDORSED]

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...
by Ziana Bhanji 1E
Sun Apr 15, 2018 2:52 pm
Forum: Significant Figures
Topic: Significant Figures When Multiplying and Dividing [ENDORSED]
Replies: 4
Views: 197

Re: Significant Figures When Multiplying and Dividing [ENDORSED]

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
by Ziana Bhanji 1E
Sun Apr 15, 2018 2:43 pm
Forum: SI Units, Unit Conversions
Topic: Moles mols mol? [ENDORSED]
Replies: 21
Views: 899

Re: Moles mols mol? [ENDORSED]

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.
by Ziana Bhanji 1E
Sun Apr 15, 2018 2:33 pm
Forum: Balancing Chemical Reactions
Topic: Suggestions for Balancing Reactions
Replies: 8
Views: 331

Re: Suggestions for Balancing Reactions

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 ...

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