Search found 32 matches
- Fri Dec 07, 2018 5:07 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
- Replies: 118
- Views: 21826
Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Hey guys! Im at another review for another final *crying emoji* , can someone PLEASE send me pictures of their notes?? I would greatly appreciate it!! my email is itzkar1@g.ucla.edu
- Fri Dec 07, 2018 4:38 pm
- Forum: Calculating pH or pOH for Strong & Weak Acids & Bases
- Topic: Strong Acids
- Replies: 5
- Views: 624
Re: Strong Acids
Hi, I think we should know the difference between both the acids, the calculations will probably just be strong acids however we should be prepared to calculate weak acids just in case.
- Fri Dec 07, 2018 4:32 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Total Charge
- Replies: 5
- Views: 715
Re: Total Charge
In order to find this total charge, you would have to sum the charges of the transition metal and the ligands.
- Tue Dec 04, 2018 11:56 pm
- Forum: Administrative Questions and Class Announcements
- Topic: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
- Replies: 118
- Views: 21826
Re: FINAL PRACTICE - Lyndon's Churro Review Session [ENDORSED]
Thank you very much!!
- Fri Nov 30, 2018 7:32 pm
- Forum: Naming
- Topic: Coordination Number
- Replies: 3
- Views: 427
Re: Coordination Number
Hi! To find the coordination number, you count the number of atoms around the central atom.
- Fri Nov 30, 2018 7:28 pm
- Forum: Naming
- Topic: Naming Coordination Compounds
- Replies: 9
- Views: 1102
Re: Naming Coordination Compounds
Hi! I dont think we need to memorize all of them but we do need to be familiar with the common ligands.
- Fri Nov 30, 2018 6:46 pm
- Forum: Naming
- Topic: Coordination number
- Replies: 10
- Views: 2122
Re: Coordination number
Hi! The coordination number is just the number of atoms attached to the central atom. However as someone stated, don't count lone pairs.
- Sun Nov 25, 2018 10:14 am
- Forum: Lewis Structures
- Topic: Polar vs Nonpolar molecules
- Replies: 7
- Views: 910
Re: Polar vs Nonpolar molecules
First step in determining if something is polar or nonpolar is drawing the lewis structure. Then you check for electronegativity , as stated below, if it doesn't cancel out then it is polar. It would help to also draw the 3D model to get a more closer look.
- Sun Nov 25, 2018 10:03 am
- Forum: Administrative Questions and Class Announcements
- Topic: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
- Replies: 135
- Views: 39643
Re: DOWNLOAD SESSION WORKSHEETS HERE - Sundays 4-6pm (Karen) [ENDORSED]
Thank you very much for these worksheets!!
- Wed Nov 21, 2018 3:33 pm
- Forum: Bond Lengths & Energies
- Topic: Dissociation Energy
- Replies: 4
- Views: 734
Re: Dissociation Energy
Are we required to know the bond dissociation energies of diatomic molecules? The table 3.3 on page 93 of the 6th edition gives a list but I dont know if we're required to memorize these.
- Sun Nov 18, 2018 11:12 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Determining Shape
- Replies: 10
- Views: 980
Re: Determining Shape
I think its best to always draw the lewis structure so you can get the most accurate answer. This way you will be able to find the shape, lone pairs, etc..
- Sun Nov 18, 2018 11:06 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Week 7 Discussion Notes (3A, 3I, 3K)
- Replies: 4
- Views: 1099
Re: Week 7 Discussion Notes (3A, 3I, 3K)
Thank you so much!
- Sun Nov 18, 2018 11:05 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 16
- Views: 1245
Re: Bond Angles
I think its best to just memorize them to be safe.
- Sun Nov 18, 2018 11:00 am
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Test 3
- Replies: 19
- Views: 1421
Re: Test 3
Hi! I think it would be best if you do memorize them since theyre not on the formula sheet for the test.
- Fri Nov 09, 2018 5:47 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionization Energies
- Replies: 13
- Views: 3708
Re: Ionization Energies
Hi! Yes since ionization energies decrease from top to bottom within a group. For example, also Fluorine also has a high ionization energy. Also, Cesium is said to have the lowest ionization energy.
- Fri Nov 09, 2018 5:13 pm
- Forum: Lewis Structures
- Topic: Formal charge question
- Replies: 9
- Views: 935
Re: Formal charge question
Hi! Yes I think that by determining the formal charge we are able to know and keep track of the electrons and thus it is important for predicting the reactivity. I think it is the best way to know if you have the most stable lewis structure.
- Fri Nov 09, 2018 4:58 pm
- Forum: Ionic & Covalent Bonds
- Topic: Ionic vs Covalent Bonds
- Replies: 18
- Views: 1823
Re: Ionic vs Covalent Bonds
Hi! So there are two types of atomic bonds, ionic and covalent. A covalent bond is two non metals bonding together. An example of a covalent bond is water (H2O). An ionic bond is when a cation (metal) bonds with a anion (nonmetal). An example of an ionic bond is NaCl. I hope this helped!
- Fri Nov 02, 2018 5:00 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
- Replies: 121
- Views: 22636
Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
For number 6 part A, we need to use the DeBroglie wavelength equation right? I used it and got 1.5547 x 10^/34 m but im not sure if I used the right equation? and I also think I messed up the units so pls correct me if needed
- Fri Nov 02, 2018 2:30 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
- Replies: 121
- Views: 22636
Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
can anyone please help me with number 2? I got to dividing the molar mass of 667 by 30.024 and got 22? but i think its wrong because its such a large number. Thus my molecular formula so far is C22H44O22 ?? pls help
- Fri Nov 02, 2018 2:23 pm
- Forum: Administrative Questions and Class Announcements
- Topic: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
- Replies: 121
- Views: 22636
Re: MIDTERM PRACTICE - Garlic Bread Review Session [ENDORSED]
Thank you very much!! This is so helpful
- Sun Oct 28, 2018 10:10 am
- Forum: Lewis Structures
- Topic: Drawing Lewis Structures with Charges
- Replies: 6
- Views: 879
Re: Drawing Lewis Structures with Charges
Hi! So for drawing Lewis structures, you remove one electron for each + 1 charge, and add one electron for each -1 charge.
- Sun Oct 28, 2018 10:08 am
- Forum: Octet Exceptions
- Topic: do we nee to memorize the octet exceptions?
- Replies: 6
- Views: 1028
Re: do we nee to memorize the octet exceptions?
I think there are only some we need to know, I think he listed them in class. I believe they were: H, He, Li, and Be.
- Sun Oct 28, 2018 10:03 am
- Forum: Ionic & Covalent Bonds
- Topic: Lowest Ionization Energy [ENDORSED]
- Replies: 7
- Views: 766
Re: Lowest Ionization Energy [ENDORSED]
Hi! You can know this by using your periodic table, but be careful because hydrogen is a bit tricky.
- Sat Oct 20, 2018 12:41 pm
- Forum: Properties of Light
- Topic: Do I have to memorize the spectrum?
- Replies: 20
- Views: 1745
Re: Do I have to memorize the spectrum?
I don't think so, maybe just the visible light range and the general order of the spectrum.
- Sat Oct 20, 2018 12:39 pm
- Forum: Properties of Light
- Topic: color of light
- Replies: 11
- Views: 1101
Re: color of light
Hi! According to the book, the color of light depends on its frequency and wavelength; long wavelength radiation has a lower frequency than short wavelength radiation (p6, edition6).
- Sat Oct 20, 2018 12:26 pm
- Forum: Properties of Light
- Topic: Calculating the wavelength of light
- Replies: 7
- Views: 1223
Calculating the wavelength of light
Hi everyone! Im studying chapter 1 (edition 6) and I came across example 1.1 which is calculating the wavelength of light of a known frequency.My question is: which numbers do i plug into the formula for C (the speed of light)? I know its 3 x 10^8 m/s but the example used 2.998 x 10^8 m/s. Is the mo...
- Wed Oct 10, 2018 7:12 pm
- Forum: Significant Figures
- Topic: Test 1
- Replies: 3
- Views: 513
Re: Test 1
Hi! No, I think they will be given, and also certain formulas and the periodic table.
- Wed Oct 10, 2018 7:04 pm
- Forum: Properties of Light
- Topic: Light acts as a wave or not?
- Replies: 10
- Views: 684
Re: Light acts as a wave or not?
Hi! According to my notes, light does act as both a wave and a particle. Hope this helps!
- Tue Oct 09, 2018 7:50 pm
- Forum: Administrative Questions and Class Announcements
- Topic: Number of questions on test one [ENDORSED]
- Replies: 39
- Views: 21817
Re: Number of questions on test one [ENDORSED]
No, I dont think we need to buy anything from the student store
- Wed Oct 03, 2018 3:10 pm
- Forum: Balancing Chemical Reactions
- Topic: Combustion Reactions.
- Replies: 8
- Views: 3040
Re: Combustion Reactions.
Hi Gabby!
Dont even apologize! My high school chemistry class didn't teach me anything either so same. So to answer your question, combustion problems will always need O2 as a reactant and H2O and CO2 as the products. Then you just continue to balance the equation and so on. I hope this helped!
Dont even apologize! My high school chemistry class didn't teach me anything either so same. So to answer your question, combustion problems will always need O2 as a reactant and H2O and CO2 as the products. Then you just continue to balance the equation and so on. I hope this helped!
- Wed Oct 03, 2018 2:59 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 3916838
Re: Post All Chemistry Jokes Here
What do you do with a dead chemist?
"Barium" (Ba)
"Barium" (Ba)
- Wed Oct 03, 2018 2:57 pm
- Forum: SI Units, Unit Conversions
- Topic: Grams/mole
- Replies: 12
- Views: 1215
Re: Grams/mole
Hi! Thank you for posting this as I was too confused on which to use. However now I know that they have the same meaning but they are just written differently. So, in g.mol ^-1 , the -1 is supposed to be the denominator, which turns out to be the same as g/mol. Really it just comes down to your pref...