Search found 31 matches

by Jennifer Zhou 1A
Tue Jul 30, 2019 7:34 pm
Forum: Administrative Questions and Class Announcements
Topic: Jonathan's Review
Replies: 2
Views: 190

Re: Jonathan's Review

Will the answers be posted? :(
by Jennifer Zhou 1A
Tue Jul 30, 2019 7:13 pm
Forum: Ionic & Covalent Bonds
Topic: Test 2 problem
Replies: 2
Views: 161

Re: Test 2 problem

so to be the most ionic, the electronegativity difference between the two bonded atoms should be the greatest. so we should choose the most electronegative element, which is F in the top right corner, and the least electronegative atom, which is Fr in the bottom left corner, to form the most ionic c...
by Jennifer Zhou 1A
Tue Jul 30, 2019 7:09 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Shape in coordination compound
Replies: 2
Views: 156

Re: Shape in coordination compound

I think we can check how many binding sites are there in total to determine the shape. here there is 3 C2O4, each C2O4 has 2, since it is a bidentate, so a total of 6 bindings sites. and this is similar to electron density regions, so the shape is octahedral
by Jennifer Zhou 1A
Tue Jul 30, 2019 4:57 pm
Forum: Identifying Acidic & Basic Salts
Topic: final review Fe(OH​2)​6 3+???
Replies: 1
Views: 137

final review Fe(OH​2)​6 3+???

in the review practice question, one of answer was like this i. Fe(OH​2)​ ​63​ +(​ aq) + H​2O​ (l) = Fe(OH​2)​ ​5(​ OH)2​ +​(aq) + H​3O​ +​ (​ aq) ii. Fe(OH​2)​ ​5(​ OH)2​ +​(aq) + H​2O​ (l) = Fe(OH​2)​ ​4(​ OH)​2+​ (​ aq) + H​3O​ +​ ​(aq) iii. Fe(OH​2)​ ​4(​ OH)2​ +​ ​(aq) + H​2O​ (l) = Fe(OH​2)​ ​...
by Jennifer Zhou 1A
Tue Jul 30, 2019 2:50 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs covalent
Replies: 5
Views: 184

Re: Ionic vs covalent

if the electronegativity difference is greater than 2, it has ionic bond if the electronegativity difference is less than 1.5, it has covalent bond How would we go about calculating electronegativity? there is an electronegativity chart if you google it, but we don't have to memorize all of them. b...
by Jennifer Zhou 1A
Tue Jul 30, 2019 2:46 pm
Forum: Dipole Moments
Topic: Effect of size [ENDORSED]
Replies: 7
Views: 461

Re: Effect of size [ENDORSED]

I think the London forces gets higher when there are more electrons, since there is a bigger electron cloud to be induced
by Jennifer Zhou 1A
Mon Jul 29, 2019 2:47 pm
Forum: Ionic & Covalent Bonds
Topic: Ionic vs covalent
Replies: 5
Views: 184

Re: Ionic vs covalent

if the electronegativity difference is greater than 2, it has ionic bond
if the electronegativity difference is less than 1.5, it has covalent bond
by Jennifer Zhou 1A
Sun Jul 28, 2019 9:20 pm
Forum: Amphoteric Compounds
Topic: acidic oxide [ENDORSED]
Replies: 3
Views: 408

Re: acidic oxide [ENDORSED]

non-metal oxides are acidic, such as SO2, because they react with water to produce corresponding acids.
SO2 react with H2O to produce H2SO4
by Jennifer Zhou 1A
Sun Jul 28, 2019 9:11 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: How to tell?
Replies: 2
Views: 157

Re: How to tell?

bronsted acid usually has an H in it, like HCl, H2SO4, since it can donate H+
bronsted base usually has an OH in it, like NaOH and KOH, so it can accept the H+ from acid to form H2O.
by Jennifer Zhou 1A
Fri Jul 26, 2019 3:39 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Ligand bonds
Replies: 1
Views: 190

Re: Ligand bonds

I think all the polydentate are marked in the book on this table, apart from them, all other mono dentate have one binding site only.
by Jennifer Zhou 1A
Fri Jul 26, 2019 3:36 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Naming coordination compounds
Replies: 3
Views: 150

Re: Naming coordination compounds

yes I think so. it's better to remember all the ligands appeared on the book
by Jennifer Zhou 1A
Fri Jul 26, 2019 3:33 pm
Forum: General Science Questions
Topic: Final Material
Replies: 3
Views: 363

Re: Final Material

No, only material after the midterm is going to be tested
by Jennifer Zhou 1A
Fri Jul 26, 2019 3:31 pm
Forum: Interionic and Intermolecular Forces (Ion-Ion, Ion-Dipole, Dipole-Dipole, Dipole-Induced Dipole, Dispersion/Induced Dipole-Induced Dipole/London Forces, Hydrogen Bonding)
Topic: H-bonds [ENDORSED]
Replies: 5
Views: 234

Re: H-bonds [ENDORSED]

because they are formed with the 3 most electronegative atoms F N and O. they attract the electron density the most.
by Jennifer Zhou 1A
Wed Jul 24, 2019 10:54 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: homework 9C7 7th edition
Replies: 2
Views: 169

homework 9C7 7th edition

Can someone explain this question to me? why can't (c) be a chelating ligand?
by Jennifer Zhou 1A
Wed Jul 24, 2019 10:42 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7430
Views: 981856

Re: Post All Chemistry Jokes Here

Even FaceApp can't make this plastic bottle age well. Only recycling can do that.
by Jennifer Zhou 1A
Wed Jul 24, 2019 10:40 pm
Forum: Naming
Topic: homework 9C1 (c)
Replies: 1
Views: 158

Re: homework 9C1 (c)

ah I got it now. no problem now
by Jennifer Zhou 1A
Wed Jul 24, 2019 10:29 pm
Forum: Naming
Topic: homework 9C1 (c)
Replies: 1
Views: 158

homework 9C1 (c)

how to name [Co(CN)5(OH2)]2- ????
by Jennifer Zhou 1A
Wed Jul 24, 2019 10:16 pm
Forum: Hybridization
Topic: homework 2.45 7th edition
Replies: 1
Views: 155

homework 2.45 7th edition

2.45 Consider the bonding in H2CPCHCHO. (a) Draw the most important Lewis structure. Include all nonzero formal charges. (b) Identify the composition of the bonds and the hybridization of each lone pair—for example, by writing s(H1s,C2sp2). I know question (a) but for question (b) can someone explai...
by Jennifer Zhou 1A
Wed Jul 24, 2019 8:12 pm
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: naming sequence
Replies: 4
Views: 214

Re: naming sequence

so we name the ligand first, then the transition metal cation (with its oxidation state as Roman numeral), then the anions In the ligand naming, we name it in the alphabetical order. for [Co(NH3)5Cl]Cl, amine starts with a, chlorine starts with c, so we name amine first. so it's pentaaminechlorocoba...
by Jennifer Zhou 1A
Wed Jul 24, 2019 8:04 pm
Forum: Conjugate Acids & Bases
Topic: J.15 6th Edition
Replies: 1
Views: 176

Re: J.15 6th Edition

so NaC6H5O dissociate into cation Na+ and C6H5O-, then the Na+ forms NaOH with the OH- from water and C6H5O- from C6H6O with H+ from water. NaC6H5O + H2O = NaOH + C6H6O
by Jennifer Zhou 1A
Wed Jul 24, 2019 7:59 pm
Forum: *Molecular Orbital Theory Applied To Transition Metals
Topic: final exam
Replies: 5
Views: 228

Re: final exam

I don't think so....
by Jennifer Zhou 1A
Wed Jul 24, 2019 7:57 pm
Forum: Bronsted Acids & Bases
Topic: Fundamentals J.7(c) (6th ed)
Replies: 2
Views: 266

Re: Fundamentals J.7(c) (6th ed)

I think it can, but requires high energy/ high temperature to react. I googled it. it needs about 700 degree Celsius to react.
CaO + 2HCN → CaCN2 + CO + H2
by Jennifer Zhou 1A
Tue Jul 23, 2019 3:45 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7430
Views: 981856

Re: Post All Chemistry Jokes Here

Two chemists walk into a bar
The first chemist says I'll have some H2O. The second says I'll have some H2O too. The second one dies shortly after.
by Jennifer Zhou 1A
Tue Jul 23, 2019 3:27 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7430
Views: 981856

Re: Post All Chemistry Jokes Here

What can you make when you have 6.022x10^23 avocados?

Guacamole, because you gotta follow Avocado’s Law.
by Jennifer Zhou 1A
Tue Jul 23, 2019 3:26 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7430
Views: 981856

Re: Post All Chemistry Jokes Here

isomers
by Jennifer Zhou 1A
Tue Jul 23, 2019 3:18 pm
Forum: Octet Exceptions
Topic: Lewis Acids and Bases
Replies: 10
Views: 406

Re: Lewis Acids and Bases

Lewis acids are electron pair acceptor. Lewis bases are electron pair donor.
by Jennifer Zhou 1A
Tue Jul 23, 2019 3:16 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Why is AX3E2 linear?
Replies: 8
Views: 276

Re: Why is AX3E2 linear?

AX3E2 is T shaped. There are 5 electron densities regions, so we can see consider it as trigonal pyramidal with 2 bonding pair changed into lone pair. Changing the pairs on the trigonal planar is more stable, hence resulting the T-shaped. I think this picture shows the shape clearly.
by Jennifer Zhou 1A
Tue Jul 23, 2019 3:05 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7430
Views: 981856

Re: Post All Chemistry Jokes Here

This is really cute!! (More of a biology joke though
by Jennifer Zhou 1A
Tue Jul 09, 2019 9:07 pm
Forum: Administrative Questions and Class Announcements
Topic: homework this week?
Replies: 1
Views: 177

homework this week?

Since this is the midterm week, I just wondering if there is still homework due this week?
If there is, still due on Thursday July 11?
by Jennifer Zhou 1A
Tue Jul 02, 2019 10:14 pm
Forum: Quantum Numbers and The H-Atom
Topic: 7th edition 1A.15
Replies: 1
Views: 214

7th edition 1A.15

sorry can someone explain how to do this question? I don't really know where to begin. 1A.15 In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the values of n for the initial and final energy levels of the electron during the emission of energy that leads to t...

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