Search found 51 matches

by Kavee Dodampahala 4E
Sat Dec 07, 2019 8:24 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: different Rydberg
Replies: 3
Views: 131

Re: different Rydberg

Is it ok to use to use the second one?
by Kavee Dodampahala 4E
Sat Dec 07, 2019 5:15 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: Kw
Replies: 3
Views: 106

Kw

What does Kw represent?
by Kavee Dodampahala 4E
Sat Dec 07, 2019 4:05 pm
Forum: Naming
Topic: transition metal suffix
Replies: 2
Views: 33

transition metal suffix

Can someone explain how to name the transition metal when the complex is positive, negative, and neutral overall?
by Kavee Dodampahala 4E
Sat Dec 07, 2019 1:28 pm
Forum: Hybridization
Topic: double and triple bonds
Replies: 6
Views: 164

double and triple bonds

How do double and triple bonds work with hybridization?
by Kavee Dodampahala 4E
Sat Dec 07, 2019 12:30 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: cis vs trans
Replies: 5
Views: 127

cis vs trans

What is the difference between the cis and trans forms of a molecule?
by Kavee Dodampahala 4E
Fri Dec 06, 2019 9:14 pm
Forum: Naming
Topic: naming formula for coordination compounds
Replies: 1
Views: 40

Re: naming formula for coordination compounds

It is alphabetical but without considering the prefixes (bi, tri, etc.)
by Kavee Dodampahala 4E
Fri Dec 06, 2019 9:12 pm
Forum: Calculating the pH of Salt Solutions
Topic: salts of weak bases/acids
Replies: 2
Views: 56

Re: salts of weak bases/acids

To determine if salt is acidic or basic you need to look at the ions it produces. Tables 6D.1 and 6D.2 in the text book list which cations and anions are acidic or basic.
by Kavee Dodampahala 4E
Fri Dec 06, 2019 9:06 pm
Forum: Lewis Acids & Bases
Topic: 6.13
Replies: 1
Views: 31

6.13

Why can B(OH)3 act as a lewis acid and accept another OH when boron normally forms only 3 bonds?
by Kavee Dodampahala 4E
Fri Dec 06, 2019 5:05 pm
Forum: Properties & Structures of Inorganic & Organic Acids
Topic: HF
Replies: 4
Views: 130

HF

Why is HF not a strong acid even though fluorine is very electronegative?
by Kavee Dodampahala 4E
Thu Dec 05, 2019 9:22 pm
Forum: Amphoteric Compounds
Topic: 6A.17
Replies: 2
Views: 98

Re: 6A.17

How can you tell what is amphoteric just by looking at the formula of the compound?
by Kavee Dodampahala 4E
Tue Nov 26, 2019 9:22 pm
Forum: Naming
Topic: Bis,tris, etc
Replies: 6
Views: 65

Bis,tris, etc

When do we use the prefixes bis, tris, tetrakis, pentakis, etc?
by Kavee Dodampahala 4E
Tue Nov 26, 2019 8:36 pm
Forum: Biological Examples
Topic: vitamin b12
Replies: 3
Views: 45

Re: vitamin b12

I don't this we need to know specific examples, just have a general understanding of how coordination compounds are biologically significant.
by Kavee Dodampahala 4E
Tue Nov 26, 2019 8:26 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Polydentate ligands/Shapes
Replies: 2
Views: 34

Re: Polydentate ligands/Shapes

The shape of the ligand is based on the VSEPR shape around the central atom. By knowing the shape of the ligand, you can see how it could possible bind to the metal in what locations, and then figure out the general shape of the complex as a whole.
by Kavee Dodampahala 4E
Tue Nov 26, 2019 8:23 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Summary for Naming Coordination Compounds
Replies: 3
Views: 43

Re: Summary for Naming Coordination Compounds

The subspecies names should be listed in alphabetical order (not including the prefixes like mono, di, etc). Then add on the prefixes based on how many of one subspecies there are, for example: (CN)3 would be tricyano. Then the metal name should be listed. If the compound has an overall negative cha...
by Kavee Dodampahala 4E
Tue Nov 26, 2019 8:12 pm
Forum: Amphoteric Compounds
Topic: How can compounds be amphoteric?
Replies: 5
Views: 62

Re: How can compounds be amphoteric?

To add on, another example of an amphoteric compound is H2O.
by Kavee Dodampahala 4E
Tue Nov 26, 2019 8:03 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Chelate
Replies: 3
Views: 33

Chelate

Is a chelate just any polydentate ligand that has the ability to form a ring?
by Kavee Dodampahala 4E
Tue Nov 26, 2019 8:00 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Test #2 handback
Replies: 11
Views: 125

Re: Test #2 handback

I think in discussion this week, or in your TA's office hours if your discussion is during break.
by Kavee Dodampahala 4E
Wed Nov 20, 2019 4:01 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: Boiling Point
Replies: 7
Views: 78

Re: Boiling Point

I agree that SO2 would have the higher boiling point for the reasons above. Intermolecular forces are what is important in this instance, not intramolecular bonds.
by Kavee Dodampahala 4E
Wed Nov 20, 2019 3:59 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: 2E.25
Replies: 3
Views: 35

Re: 2E.25

I think it would help if you thought about the molecule in three dimensions. It would have a tetrahedral shape and so regardless of how the lewis structure is drawn, in real life, from any perspective, one side of the molecule would have the two hydrogens and the others would have the two chlorines,...
by Kavee Dodampahala 4E
Wed Nov 20, 2019 3:55 pm
Forum: Polarisability of Anions, The Polarizing Power of Cations
Topic: polarizability
Replies: 9
Views: 185

Re: polarizability

Larger molecules also have more electrons in general which makes them more polarizable.
by Kavee Dodampahala 4E
Wed Nov 20, 2019 3:53 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Do we need to know the pentagonal bipyramidal model for Test 2?
Replies: 6
Views: 74

Re: Do we need to know the pentagonal bipyramidal model for Test 2?

I think it would be good to know for the future, regardless if we need to know it now.
by Kavee Dodampahala 4E
Wed Nov 20, 2019 3:51 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Molecular Shape vs. Geometry
Replies: 5
Views: 76

Re: Molecular Shape vs. Geometry

The electron pair geometry is based only on how many regions of electron density there are around the atom (whether it is a bonding pair or lone pair is irrelevant). If a molecule has 2 regions of electron density, then the electron density is linear, if there is 3: trigonal planar, 4: tetrahedral, ...
by Kavee Dodampahala 4E
Wed Nov 20, 2019 3:44 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Coordinate bonds
Replies: 3
Views: 49

Coordinate bonds

Can someone explain how coordinate bonds and ligands work?
by Kavee Dodampahala 4E
Thu Nov 14, 2019 7:37 pm
Forum: General Science Questions
Topic: Final
Replies: 10
Views: 184

Re: Final

I believe the final is cumulative.
by Kavee Dodampahala 4E
Thu Nov 14, 2019 7:37 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Trigonal Pyramid vs Trigonal Planar
Replies: 6
Views: 52

Re: Trigonal Pyramid vs Trigonal Planar

Trigonal planar has just three areas of electron density. Trigonal pyramidal has four areas of electron density, one of those areas being a lone pair.
by Kavee Dodampahala 4E
Thu Nov 14, 2019 7:33 pm
Forum: Dipole Moments
Topic: Molecular Structure
Replies: 2
Views: 30

Re: Molecular Structure

The opposite is true. The molecular structures influence the dipole moment.
by Kavee Dodampahala 4E
Thu Nov 14, 2019 7:32 pm
Forum: General Science Questions
Topic: Midterm
Replies: 7
Views: 122

Re: Midterm

I went and talked to my TA.
by Kavee Dodampahala 4E
Thu Nov 14, 2019 7:31 pm
Forum: Lewis Structures
Topic: Lewis Structure
Replies: 6
Views: 66

Re: Lewis Structure

To make sure a lewis structure is at its lowest energy you should calculate the formal charge for each atom. The lewis structure with the most formal charges closest to zero is the most stable and has the lowest energy.
by Kavee Dodampahala 4E
Sun Nov 03, 2019 8:54 pm
Forum: Lewis Structures
Topic: Radicals
Replies: 5
Views: 84

Re: Radicals

Can someone explain why the more electronegative element gets the radical? In my mind, it would make more sense for the less electronegative one to have it.
by Kavee Dodampahala 4E
Sat Nov 02, 2019 7:43 pm
Forum: Lewis Structures
Topic: Ion formation vs molecule
Replies: 2
Views: 34

Re: Ion formation vs molecule

To see if an ionic or covalent bond would from you should look at the difference in electronegativity between the two atoms involved in the bond. If the electronegativity difference is greater than than 2 then an ionic bond will form. If the electronegativity difference is less than 1.5 then a coval...
by Kavee Dodampahala 4E
Sat Nov 02, 2019 7:37 pm
Forum: Ionic & Covalent Bonds
Topic: Electron Distortion
Replies: 4
Views: 46

Electron Distortion

What does it mean for an electron to be distorted in a bond?
by Kavee Dodampahala 4E
Sat Nov 02, 2019 7:31 pm
Forum: Lewis Structures
Topic: Determining most stable Lewis structure
Replies: 5
Views: 80

Re: Determining most stable Lewis structure

Formal charge is the most important in determining the most stable structure.
by Kavee Dodampahala 4E
Sat Nov 02, 2019 7:23 pm
Forum: Dipole Moments
Topic: Midterm
Replies: 8
Views: 122

Re: Midterm

I don't think so because that was on the last page of notes and he said that content would not be covered on the midterm.
by Kavee Dodampahala 4E
Tue Oct 29, 2019 9:12 pm
Forum: Ionic & Covalent Bonds
Topic: Valence Electrons?
Replies: 15
Views: 158

Re: Valence Electrons?

Could someone further clarify the answer to this question? I'm still confused about how to figure out the number of valence electrons for transition metals.
by Kavee Dodampahala 4E
Fri Oct 25, 2019 8:08 pm
Forum: Ionic & Covalent Bonds
Topic: ion charge
Replies: 3
Views: 29

Re: ion charge

You should look at the number of valence electrons the element has based on its position in the periodic table. For example, sulfur has 6 valence electrons and so would gain 2 more electrons to have a full octet. Gaining 2 electrons would then make a -2 ion.
by Kavee Dodampahala 4E
Fri Oct 25, 2019 8:05 pm
Forum: Quantum Numbers and The H-Atom
Topic: 1D.19
Replies: 3
Views: 84

Re: 1D.19

You would find ml from l.
by Kavee Dodampahala 4E
Fri Oct 25, 2019 7:59 pm
Forum: Quantum Numbers and The H-Atom
Topic: Magnetic Quantum Number
Replies: 5
Views: 57

Re: Magnetic Quantum Number

You would write out all the values like -2, -1, 0, 1, 2, because those are the values, not 5.
by Kavee Dodampahala 4E
Fri Oct 25, 2019 7:55 pm
Forum: Sigma & Pi Bonds
Topic: Difference between Sigma & Pi
Replies: 5
Views: 84

Re: Difference between Sigma & Pi

I know that both can exist at the same time in a molecule.
by Kavee Dodampahala 4E
Fri Oct 25, 2019 7:41 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Homework Help
Replies: 5
Views: 58

Re: Homework Help

You should also look at if the spins are all in the same direction for an orbital filled with just parallel electrons to make sure it is in the ground state.
by Kavee Dodampahala 4E
Sun Oct 20, 2019 4:26 pm
Forum: Quantum Numbers and The H-Atom
Topic: Wave Function
Replies: 4
Views: 57

Wave Function

Is a wave function just the set of the four quantum numbers of an electron?
by Kavee Dodampahala 4E
Sun Oct 20, 2019 4:22 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: paired and parallel electrons
Replies: 3
Views: 47

Re: paired and parallel electrons

According to Hund's rule, every orbital must have one electron before each orbital has a pair of electrons. The number of electrons before you can start pairing depends on the orbital. For example, in a p subshell if there was only 3 electrons, they would all be parallel. However, if there was 4 ele...
by Kavee Dodampahala 4E
Sun Oct 20, 2019 4:13 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1362932

Re: Post All Chemistry Jokes Here

Why do chemists enjoy working with ammonia? Because it's pretty basic stuff.
by Kavee Dodampahala 4E
Sun Oct 20, 2019 4:06 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Spin up and spin down
Replies: 13
Views: 180

Re: Spin up and spin down

An electron does not actually spin "up" or "down" these are just words we use to describe 2 different states.
by Kavee Dodampahala 4E
Sat Oct 19, 2019 9:50 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: how to prepare
Replies: 22
Views: 219

Re: how to prepare

Going to the step up sessions or making your own study group could be helpful!
by Kavee Dodampahala 4E
Sat Oct 19, 2019 9:47 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Which Element to Use in Electron Configurations
Replies: 5
Views: 59

Re: Which Element to Use in Electron Configurations

When writing out electron configurations out, there are 2 formats you can use. The first format is writing it all out, for example the electron configuration for lithium would be writing as 1s2 2s1. The second format is naming the past noble gas before the element and just writing the configuration ...
by Kavee Dodampahala 4E
Tue Oct 08, 2019 8:00 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7951
Views: 1362932

Re: Post All Chemistry Jokes Here

If no one laughs at your chem jokes, keep going until you get a reaction.
by Kavee Dodampahala 4E
Tue Oct 08, 2019 7:54 pm
Forum: Significant Figures
Topic: Answer being a tad bit off
Replies: 8
Views: 333

Re: Answer being a tad bit off

I remember my TA saying that you should have the exact answer if a problem was done correctly so you would get a point off if it was a little off.
by Kavee Dodampahala 4E
Tue Oct 08, 2019 7:53 pm
Forum: SI Units, Unit Conversions
Topic: test and question e1
Replies: 3
Views: 106

Re: test and question e1

I also believe you would not be deducted points for that. However, I do remember it was mentioned that you should put your answer in the most logical unit.
by Kavee Dodampahala 4E
Tue Oct 08, 2019 7:48 pm
Forum: Ideal Gases
Topic: Reading the textbook [ENDORSED]
Replies: 134
Views: 102730

Re: Reading the textbook [ENDORSED]

Reading the textbook helps me understand the concepts at my own pace. I find it really useful!

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