Search found 51 matches

by Adam_ElSayed_3B
Thu Dec 17, 2020 2:38 am
Forum: General Science Questions
Topic: Passing Grade
Replies: 34
Views: 282

Re: Passing Grade

50% of ALL points. Check out the syllabus & good luck!
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:37 am
Forum: Properties of Light
Topic: Wavelength
Replies: 26
Views: 219

Re: Wavelength

Determining spectrum would be a good example of nm, but I'm sure in experimentation it isn't hard to switch between the two at all.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:36 am
Forum: Sigma & Pi Bonds
Topic: Bond length [ENDORSED]
Replies: 9
Views: 60

Re: Bond length [ENDORSED]

We use VESPR theory and our knowledge of different compounds and their bond lengths, but I've only ever heard of it being done with a computer.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:35 am
Forum: Properties of Electrons
Topic: Difference between electrons and light properties
Replies: 5
Views: 77

Re: Difference between electrons and light properties

Well for one, electrons are charged. They behave totally differently. A photon is more energy condensed, while an electron is a charge. I'm not good enough at quantum physics to go further.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:34 am
Forum: Naming
Topic: Naming Coordination Complexes
Replies: 4
Views: 29

Re: Naming Coordination Complexes

I start grouping things into my head, and making mental connections. E.g. this one ligand corresponds to this name, and then coming up with a quirky way or connection to it. I've caught myself singing to memorize before. It's hard though, best of luck.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:33 am
Forum: Student Social/Study Group
Topic: Plans for Relaxing After Finals
Replies: 98
Views: 565

Re: Plans for Relaxing After Finals

What a sweet post! I plan to use up my swipes and enjoy my time at UCLA before I have to go home.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:32 am
Forum: Lewis Acids & Bases
Topic: Lewis vs Bronsted
Replies: 20
Views: 112

Re: Lewis vs Bronsted

Think of it like an umbrella - Lewis bases' definition, using lone pairs, encompass more than the smaller umbrella of Bronsted.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:31 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Organic vs Inorganic
Replies: 5
Views: 56

Re: Organic vs Inorganic

Organic chemistry is the chemistry of carbons, so yes!
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:30 am
Forum: Photoelectric Effect
Topic: Decimals
Replies: 6
Views: 70

Re: Decimals

I do four, but you're really thinking about significant figures here, which change based on the problem text.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:30 am
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Calculating H+
Replies: 17
Views: 73

Re: Calculating H+

You're essentially going backwards. Initially you take the negative log, so do the opposite. From there, you'll have your pKa and can move forward accordingly.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:29 am
Forum: Amphoteric Compounds
Topic: More likely acid or base
Replies: 4
Views: 47

Re: More likely acid or base

Yep! Depending on what H2O is around, it might act as an acid or a base. I imagine that this applies to the environment around it on a greater scale.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:28 am
Forum: Sigma & Pi Bonds
Topic: Pi Bonds
Replies: 15
Views: 110

Re: Pi Bonds

Pi bonds by nature can only apply to covalent bonds. Ionic bonds don't engage in sigma or pi bonds.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:27 am
Forum: Ionic & Covalent Bonds
Topic: Ionic vs Covalent Bonds
Replies: 9
Views: 63

Re: Ionic vs Covalent Bonds

As others have said, compare electronegativity, but I find that it helps to recognize that salts and metals will almost always be ionic.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:26 am
Forum: Polyprotic Acids & Bases
Topic: Defintion
Replies: 24
Views: 793

Re: Defintion

Something is polyprotic when there are multiple protons (H) available to be deprotonated.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:26 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Stronger acids and stability?
Replies: 5
Views: 66

Re: Stronger acids and stability?

Stronger acids aren't stable, as they're likely to act as an acid and react. However, their conjugate bases are rather stable.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:24 am
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: Why isn't HF a strong acid?
Replies: 23
Views: 148

Re: Why isn't HF a strong acid?

HF doesn't want to disassociate. The electronegativity is different enough that they're basically stuck to one another, and won't act as a strong acid.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:23 am
Forum: SI Units, Unit Conversions
Topic: Avogadro's Number
Replies: 12
Views: 129

Re: Avogadro's Number

The roadmap we've seen in stereochemistry explains the use of Avogadro's number. From going from moles to atoms or vice versa, Avogadro's number is the way to go.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:22 am
Forum: *Titrations & Titration Calculations
Topic: Polyprotic Acids and Bases
Replies: 3
Views: 72

Re: Polyprotic Acids and Bases

A polyprotic compound has multiple places where it can be deprotonated. The Hs can be taken off, and there are multiple of them.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:21 am
Forum: Identifying Acidic & Basic Salts
Topic: Determining Acids or Bases (Number based)
Replies: 3
Views: 47

Re: Determining Acids or Bases (Number based)

Below a pH of 7 is acidic, and above it is basic. I find using the pKa to find pH to be the easiest way to figure out if something is acidic or basic for sure.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:20 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Seesaw vs. trigonal pyramidal
Replies: 22
Views: 161

Re: Seesaw vs. trigonal pyramidal

They aren't the same! One refers to a # of 5, the other to a 4. Others have explained shape!
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:19 am
Forum: Determining Molecular Shape (VSEPR)
Topic: wedge and dash
Replies: 14
Views: 108

Re: wedge and dash

If you're staring straight at it, a wedge is away from you and a dash is towards you. Sometimes you'll see a combined notation referring to the bond being either in different conformations.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:18 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Tetrahedral molecular shape
Replies: 10
Views: 99

Re: Tetrahedral molecular shape

A tetrahedral shape doesn't really fill in a sphere. There's no need for it to add up to 360 degrees.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:17 am
Forum: Hybridization
Topic: Hybridization of 2p and 2p2
Replies: 2
Views: 13

Re: Hybridization of 2p and 2p2

I believe it refers to the orbitals being filled with two electrons.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:16 am
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 187
Views: 108925

Re: Reading the textbook [ENDORSED]

Honestly not a huge fan of the textbook. I'll stick to rewatching portions of the lecture any day.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:14 am
Forum: Determining Molecular Shape (VSEPR)
Topic: What are the bond angles for T shaped?
Replies: 17
Views: 126

Re: What are the bond angles for T shaped?

Slightly less than 90 degrees.
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:13 am
Forum: Determining Molecular Shape (VSEPR)
Topic: Bent vs Angular
Replies: 20
Views: 140

Re: Bent vs Angular

Bent and angular are the same as many others have said!
by Adam_ElSayed_3B
Thu Dec 17, 2020 2:12 am
Forum: Hybridization
Topic: Hybridization
Replies: 2
Views: 10

Re: Hybridization

When there's only one s, yes. Otherwise, it fills in in order (e.g. sp2)
by Adam_ElSayed_3B
Sun Nov 29, 2020 4:35 pm
Forum: Hybridization
Topic: Single Bonds and Sigma Bonds
Replies: 23
Views: 119

Re: Single Bonds and Sigma Bonds

A single bond IS a sigma bond! For single through triple bonds they all have one sigma bond, and increase by one pi bond her extra bond starting with a single bond having 0 pi bonds, a double having 1 pi bond, ect.
by Adam_ElSayed_3B
Sun Nov 29, 2020 4:34 pm
Forum: Hybridization
Topic: Sapling Week 7/8 HW #11
Replies: 13
Views: 76

Re: Sapling Week 7/8 HW #11

solving these problems is as simple as counting the amount of surrounding bonds/lone pairs and finding the nswer that has the amount of orbitals that match!
by Adam_ElSayed_3B
Sun Nov 29, 2020 4:30 pm
Forum: Hybridization
Topic: Sapling #18
Replies: 10
Views: 105

Re: Sapling #18

There is a difference between how the hydrogens are placed on a 3D model depending on whether there are an even or odd number of carbons
by Adam_ElSayed_3B
Sun Nov 29, 2020 4:19 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Sapling #17
Replies: 10
Views: 106

Re: Sapling #17

Because there are no negative charges or anything there are no resonance structures
by Adam_ElSayed_3B
Sun Nov 29, 2020 3:11 pm
Forum: Hybridization
Topic: Sapling #11
Replies: 19
Views: 133

Re: Sapling #11

A tip my friend told me is to count up the number of lone pairs + the number of bonds, and then find the answer that counts up to that same number! For example sp3 would add up to 4 because there is a 1 in the s spot and a 3 in the p spot
by Adam_ElSayed_3B
Sun Nov 15, 2020 11:59 pm
Forum: Ionic & Covalent Bonds
Topic: Sapling week 5 & 6 #16
Replies: 7
Views: 43

Re: Sapling week 5 & 6 #16

Why are O N and F atoms the only ones that bond with hyrdrogen for these types of problems ?
by Adam_ElSayed_3B
Sun Nov 15, 2020 11:58 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Sapling week 5 & 6 #5
Replies: 20
Views: 128

Re: Sapling week 5 & 6 #5

To find resonance you would take the number of valence electrons of the respective Element, and from that subtract the number of electrons/bonds around it. A single bond counts as one, and each electron counts as one
by Adam_ElSayed_3B
Sun Nov 15, 2020 11:57 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Sapling week 5 & 6 #5
Replies: 20
Views: 128

Re: Sapling week 5 & 6 #5

To find resonance you would take the number of valence electrons of the respective Element, and from that subtract the number of electrons/bonds around it. A single bond counts as one, and each electron counts as one
by Adam_ElSayed_3B
Sun Nov 15, 2020 11:55 pm
Forum: Ionic & Covalent Bonds
Topic: Sapling week 5 & 6 #16
Replies: 7
Views: 43

Re: Sapling week 5 & 6 #16

The correct answer would be D because it is the only one that has has H connected to an O,N, and F molecule on each side.
by Adam_ElSayed_3B
Sun Nov 08, 2020 11:42 pm
Forum: Quantum Numbers and The H-Atom
Topic: Are there subshells past f?
Replies: 28
Views: 177

Re: Are there subshells past f?

I believe it goes up to f, but generally speaking we never really do work past d. It gets pretty confusing.
by Adam_ElSayed_3B
Sun Nov 08, 2020 11:41 pm
Forum: Lewis Structures
Topic: Lewis acids and bases
Replies: 10
Views: 75

Re: Lewis acids and bases

You could use pKa, which is a numerical value representing the acidity of a molecule, or just look at the molecule itself to see if it would accept or give electrons.
by Adam_ElSayed_3B
Sun Nov 08, 2020 11:38 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: What are orbitals?
Replies: 10
Views: 140

Re: What are orbitals?

To my knowledge, orbitals are more representations of where the electron can be found at any given time. For example, with an s orbital, there's a sphere of space where the electron can be found, whereas with the p orbital it's more of a peanut shape.
by Adam_ElSayed_3B
Sun Nov 08, 2020 11:35 pm
Forum: Bond Lengths & Energies
Topic: Bond Lengths
Replies: 10
Views: 79

Re: Bond Lengths

Because the representation of double and single bonds is just that - A representation. In our experience thus far, most chemical representations on paper don't reveal the whole paper. For example, Lewis structures don't show resonance, the same way Newman structures don't show the valence electrons....
by Adam_ElSayed_3B
Sun Nov 08, 2020 11:35 pm
Forum: Bond Lengths & Energies
Topic: Bond Lengths
Replies: 10
Views: 79

Re: Bond Lengths

Because the representation of double and single bonds is just that - A representation. In our experience thus far, most chemical representations on paper don't reveal the whole paper. For example, Lewis structures don't show resonance, the same way Newman structures don't show the valence electrons....
by Adam_ElSayed_3B
Sun Nov 08, 2020 11:29 pm
Forum: Trends in The Periodic Table
Topic: memorizing trends
Replies: 14
Views: 59

Re: memorizing trends (Electron Affinity)

For electron affinity, it increases the more u head towards the top right of the periodic table, and the least electron affinitive element would be the bottom left element (Francium). hope this helps :)
by Adam_ElSayed_3B
Sun Oct 18, 2020 4:36 pm
Forum: Properties of Light
Topic: Example during lecture 6
Replies: 5
Views: 90

Sapling Week 2 Question 9

What is the easiest way to calculate wavelength when an atom is transition between different energy levels (levels for n)?
by Adam_ElSayed_3B
Sun Oct 18, 2020 4:28 pm
Forum: Photoelectric Effect
Topic: Sapling #4 Homework Part 2
Replies: 9
Views: 122

Sapling Week 2 Question 3

How do you determine wavelength, frequency, and energy from the amount of photons a wave of light produces?
by Adam_ElSayed_3B
Sun Oct 18, 2020 2:12 pm
Forum: Properties of Light
Topic: Electric Waves and Magnetic Waves
Replies: 2
Views: 28

Electromagnetic Radiation

What are the different level of light radiations compared to eachother? For example gamma compared to ultraviolet, ect.
by Adam_ElSayed_3B
Sun Oct 18, 2020 2:01 pm
Forum: Properties of Electrons
Topic: Electron Wave-Particle Duality
Replies: 10
Views: 109

Electromagnetic Waves

Hey guys, I just wanted to know what the difference between amplitude, wavelength, and frequencies are in wavelength illustrations. Also how do you determine Energy?
by Adam_ElSayed_3B
Sun Oct 11, 2020 7:22 pm
Forum: Empirical & Molecular Formulas
Topic: Sapling Wk 1 Question 10
Replies: 4
Views: 54

Re: Sapling Wk 1 Question 10

What do the 1-bromopropane and the magnesium represent in the equation as pictured in the problem? Because as far as I've solved it I did not reference those elements
by Adam_ElSayed_3B
Sun Oct 11, 2020 7:15 pm
Forum: Molarity, Solutions, Dilutions
Topic: Sapling HW Number 7
Replies: 12
Views: 129

Re: Sapling HW Number 7

Number 7 is quite simple, the only components are CaCl2 and water, it gives the total mass of the compound and the percent of that amount is CaCl2. Just Minus the percent of cacl2 from 100 to get the percent of water, then take the respective percent of what element you want from the total weight of...
by Adam_ElSayed_3B
Sun Oct 11, 2020 7:10 pm
Forum: Molarity, Solutions, Dilutions
Topic: Sapling HW #6
Replies: 8
Views: 82

Re: Sapling HW #6

When I did this problem I made a lot of mistakes, such as mistaking the correct decimal points, but just double check that all ur calculations are right and youll be fine. Get the molar mass, and then anonther mistake I made was put v=m/n instead of v=n/m so watch out for stupid miscalculations.
by Adam_ElSayed_3B
Sun Oct 11, 2020 6:45 pm
Forum: Significant Figures
Topic: Sapling #4
Replies: 10
Views: 71

Sapling #4

I am somewhat confused about the number 20.00, because the decimal is preceded by a 0, so would the sig fig rule that includes the 2 0s after the decimal point still count?
by Adam_ElSayed_3B
Sun Oct 11, 2020 6:29 pm
Forum: SI Units, Unit Conversions
Topic: Avogadro's Constant
Replies: 12
Views: 126

Re: Avogadro's Constant

Avagadro's number represents 6.023 x 10^23, and is often used to calculate the number of particles in an element. It can be used to convert moles to number of things (particles, atoms, ect.) Other than that my knowledge of avagadro's number and its application in conversions is a little rusty hahaha.

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