Search found 26 matches

by 405398682
Sun Dec 01, 2019 3:06 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Strong and Weak Acids
Replies: 7
Views: 64

Re: Strong and Weak Acids

Typical strong acid:
HCl HNO3 H2SO4 HBr HI HClO4 HClO3
by 405398682
Sun Dec 01, 2019 3:04 pm
Forum: Lewis Acids & Bases
Topic: acid v. base?
Replies: 16
Views: 111

Re: acid v. base?

You can distinguish them by figuring out which one accepts proton and which one donates proton.
by 405398682
Sun Dec 01, 2019 3:02 pm
Forum: Calculating the pH of Salt Solutions
Topic: pH of acids
Replies: 13
Views: 401

Re: pH of acids

The pH value is like a scale. From 0 to 14 it goes from more acid to more basic.
by 405398682
Sun Dec 01, 2019 3:01 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Value of pH
Replies: 8
Views: 58

Re: Value of pH

Yes, pH value can go below 0 and go above 14, but I think the negative pH is not our class focus.
by 405398682
Sun Dec 01, 2019 3:00 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: strong or weak base?
Replies: 13
Views: 112

Re: strong or weak base?

They can be distinguished by the level that they ionize in water. Strong base tends to be ionized more in water.
by 405398682
Sun Dec 01, 2019 2:58 pm
Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
Topic: Relative Acidity
Replies: 4
Views: 45

Re: Relative Acidity

Higher electronegativity means stronger attraction, which leads to more polarized and more stable.
by 405398682
Sun Nov 10, 2019 11:06 pm
Forum: Octet Exceptions
Topic: Octet exception
Replies: 13
Views: 197

Octet exception

What elements are exempted from Octet rule (eg. P) and why?
by 405398682
Sun Nov 10, 2019 11:05 pm
Forum: Dipole Moments
Topic: Dipole moment units
Replies: 4
Views: 31

Re: Dipole moment units

Dipole moment calculates the polarity of the chemical bond (how different the polarity between the two atoms are)
by 405398682
Sun Nov 10, 2019 11:00 pm
Forum: Lewis Structures
Topic: When to draw Resonance Structures
Replies: 14
Views: 117

Re: When to draw Resonance Structures

I will recommend drawing all of them just in case though most stable ones should be fine.
by 405398682
Sun Nov 10, 2019 10:58 pm
Forum: Formal Charge and Oxidation Numbers
Topic: How to know where a double bond should go?
Replies: 10
Views: 93

Re: How to know where a double bond should go?

Most time the double bond can go with any atom (mainly the central atom) in the structure as long as it meets the octant rule.
by 405398682
Sun Nov 10, 2019 10:54 pm
Forum: Bond Lengths & Energies
Topic: Strongest Bond
Replies: 15
Views: 103

Re: Strongest Bond

covalent>ionic>hydrogen>dipole-dipole (strongest to weakest)
by 405398682
Sun Nov 03, 2019 8:09 pm
Forum: Quantum Numbers and The H-Atom
Topic: H-atom
Replies: 1
Views: 24

H-atom

Why does the energy level only work on H-atom?
by 405398682
Sun Nov 03, 2019 8:03 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: High polarizing Power?
Replies: 2
Views: 26

High polarizing Power?

What does it mean when ions have high polarizing power? Does it have anything to do with being covalent/ionic?
by 405398682
Sun Nov 03, 2019 8:00 pm
Forum: Lewis Structures
Topic: Which element at center of the structure
Replies: 6
Views: 44

Which element at center of the structure

How do I know which element is the center besides Carbon?
by 405398682
Sun Nov 03, 2019 7:59 pm
Forum: Lewis Structures
Topic: Resonance Structure
Replies: 4
Views: 46

Resonance Structure

When we are asked to draw lewis structure, do I need to draw the resonance structure as well?
by 405398682
Sun Nov 03, 2019 7:58 pm
Forum: Electronegativity
Topic: Electronegativity and ionic/covalent bond
Replies: 2
Views: 23

Electronegativity and ionic/covalent bond

How does electronegativity relate to ionic/covalent bond?
by 405398682
Sun Oct 13, 2019 4:09 pm
Forum: Administrative Questions and Class Announcements
Topic: Advice from a Medical Student [ENDORSED]
Replies: 158
Views: 94308

Re: Advice from a Medical Student [ENDORSED]

Thank you very much! I really got a better idea of how to be a pre-med student!
by 405398682
Sun Oct 13, 2019 4:08 pm
Forum: Administrative Questions and Class Announcements
Topic: Test 2
Replies: 1
Views: 38

Test 2

Does anyone know what topics will be covered in Test 2?
by 405398682
Sun Oct 13, 2019 4:07 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 2 Homework Problems [ENDORSED]
Replies: 67
Views: 2010

Re: Week 2 Homework Problems [ENDORSED]

We can do both of them or just choose one unit to work on.
by 405398682
Sun Oct 13, 2019 4:06 pm
Forum: Administrative Questions and Class Announcements
Topic: Week 3 HW Problem
Replies: 1
Views: 21

Week 3 HW Problem

Are we only allowed to do questions from the quantum section this week?
by 405398682
Sun Oct 13, 2019 4:05 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1152606

Re: Post All Chemistry Jokes Here

Q: Why cylinders smarter than you?
A:Because they are graduated cylinder
by 405398682
Sat Oct 05, 2019 11:21 pm
Forum: General Science Questions
Topic: Rusty on High School Chem [ENDORSED]
Replies: 169
Views: 116099

Re: Rusty on High School Chem [ENDORSED]

Well, the first week I feel like we just went over the general chem in high school (not ap chem), but I DO think you need to know some basic concepts in chemistry in order not to make your life so hard in 14A. The best thing to do would be taking a diagnostic test and see how you feel about learning...
by 405398682
Sat Oct 05, 2019 11:17 pm
Forum: Empirical & Molecular Formulas
Topic: Writing Empirical Formulas
Replies: 8
Views: 130

Re: Writing Empirical Formulas

The order of the elements is not that important in this kind of question. As long as you get the ratio of the mass of every element correct, I think you will be fine.
by 405398682
Sat Oct 05, 2019 11:15 pm
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 116
Views: 12994

Re: All students read this sig fig post [ENDORSED]

Should I take sig figs while I am calculating one problem step by step? Should I use sig figs every step or should I just consider the sig figs on the very last calculation?
by 405398682
Sat Oct 05, 2019 11:14 pm
Forum: Significant Figures
Topic: All students read this sig fig post [ENDORSED]
Replies: 116
Views: 12994

Re: All students read this sig fig post [ENDORSED]

I can easily get confused when I am trying to figure out the sig figs in the calculation of mole/mass using molar mass. Should I just consider the number of sig figs depending on the numbers in the molar mass?
by 405398682
Sat Oct 05, 2019 11:12 pm
Forum: Significant Figures
Topic: Sig Figs of Mass Percentage Composition?
Replies: 3
Views: 56

Re: Sig Figs of Mass Percentage Composition?

I think for emperial and molecular formula it doesn't really matter. I would take as many as possible( like 5-6 sig figs) cause in order to get a more accurate ratio, the more accurate your numbers are, the more accurate your ratio between moles will be.

Go to advanced search