CHEMISTRY COMMUNITY

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Typical strong acid:
HCl HNO3 H2SO4 HBr HI HClO4 HClO3

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You can distinguish them by figuring out which one accepts proton and which one donates proton.

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The pH value is like a scale. From 0 to 14 it goes from more acid to more basic.

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Yes, pH value can go below 0 and go above 14, but I think the negative pH is not our class focus.

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They can be distinguished by the level that they ionize in water. Strong base tends to be ionized more in water.

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Higher electronegativity means stronger attraction, which leads to more polarized and more stable.

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What elements are exempted from Octet rule (eg. P) and why?

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Dipole moment calculates the polarity of the chemical bond (how different the polarity between the two atoms are)

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I will recommend drawing all of them just in case though most stable ones should be fine.

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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.

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covalent>ionic>hydrogen>dipole-dipole (strongest to weakest)

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Why does the energy level only work on H-atom?

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What does it mean when ions have high polarizing power? Does it have anything to do with being covalent/ionic?

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How do I know which element is the center besides Carbon?

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When we are asked to draw lewis structure, do I need to draw the resonance structure as well?

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How does electronegativity relate to ionic/covalent bond?

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Thank you very much! I really got a better idea of how to be a pre-med student!

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Does anyone know what topics will be covered in Test 2?

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We can do both of them or just choose one unit to work on.

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Are we only allowed to do questions from the quantum section this week?

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Q: Why cylinders smarter than you?
A：Because they are graduated cylinder

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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...

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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.

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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?

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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?

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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.

CHEMISTRY COMMUNITY

Search found 26 matches

Re: Strong and Weak Acids

Re: acid v. base?

Re: pH of acids

Re: Value of pH

Re: strong or weak base?

Re: Relative Acidity

Octet exception

Re: Dipole moment units

Re: When to draw Resonance Structures

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

Re: Strongest Bond

H-atom

High polarizing Power?

Which element at center of the structure

Resonance Structure

Electronegativity and ionic/covalent bond

Re: Advice from a Medical Student [ENDORSED]

Test 2

Re: Week 2 Homework Problems [ENDORSED]

Week 3 HW Problem

Re: Post All Chemistry Jokes Here

Re: Rusty on High School Chem [ENDORSED]

Re: Writing Empirical Formulas

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

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

Re: Sig Figs of Mass Percentage Composition?