Search found 32 matches
- Wed Jun 13, 2018 4:22 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Salts of weak bases and acids
- Replies: 1
- Views: 408
Re: Salts of weak bases and acids
Salts of weak bases tend to make acidic solutions because the reaction would involve a weak base and strong acid leading to more acidic ions. The opposite could be said of a reaction with a strong base and weak acid.
- Wed Jun 13, 2018 4:14 pm
- Forum: Lewis Acids & Bases
- Topic: Determine Lewis Acid
- Replies: 13
- Views: 1582
Re: Determine Lewis Acid
An easy way to tell which one is an acid is to write out the balanced chemical equation and the species that accepts the electrons will be the Lewis acid.
- Wed Jun 13, 2018 4:10 pm
- Forum: Lewis Acids & Bases
- Topic: identifying strong acids
- Replies: 2
- Views: 616
Re: identifying strong acids
There are 6 main strong acids and they are:
HI
HBr
HCl
HClO4
H2SO4
HNO3
HI
HBr
HCl
HClO4
H2SO4
HNO3
- Sat Jun 02, 2018 12:25 pm
- Forum: Shape, Structure, Coordination Number, Ligands
- Topic: Tetrahedral and Square planar
- Replies: 8
- Views: 1393
Re: Tetrahedral and Square planar
Tetrahedral exists in multiple planes and has four atoms surrounding one central atoms where a square planar is in one plane surrounded by multiple other atoms.
- Sat Jun 02, 2018 12:22 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 7
- Views: 783
Re: Bond Angles
We just need to know the main bond angles associated with molecular shapes for the test.
- Sat Jun 02, 2018 12:14 pm
- Forum: Hybridization
- Topic: basics of hybridization
- Replies: 18
- Views: 2366
Re: basics of hybridization
Hybridization is related to the valence bond theory and is used to influence molecular geometry and bonding properties based off of how atomic orbitals are fused to form newly hybridized orbitals.
- Sat Jun 02, 2018 12:05 pm
- Forum: Hybridization
- Topic: VSEPR
- Replies: 11
- Views: 1474
Re: VSEPR
The VSEPR model is used to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms.
- Sat Jun 02, 2018 12:01 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Valence Bond Theory
- Replies: 2
- Views: 618
Re: Valence Bond Theory
Here is a video that I found pretty helpful in understanding these theories a little more: https://www.youtube.com/watch?v=nTujP4jCbsg
It goes over valence bond theory, hybrid orbitals, and molecular orbital theory.
It goes over valence bond theory, hybrid orbitals, and molecular orbital theory.
- Sat Jun 02, 2018 11:58 am
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Double bond
- Replies: 5
- Views: 707
Re: Double bond
An easy way to remember this is to realize that as the number of electrons between two nuclei increases, bonds become shorter and stronger.
- Wed May 16, 2018 4:15 pm
- Forum: Lewis Structures
- Topic: Central atom
- Replies: 7
- Views: 836
Re: Central atom
When drawing Lewis structures, the lowest ionization energy will always go in the middle because it requires the least amount of energy to share the electrons.
- Wed May 16, 2018 4:12 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2763000
Re: Post All Chemistry Jokes Here
Two men walk into a bar. One says "I'll have some H2O." The other man says "I'll have some H20, too." The second man died.
- Wed May 16, 2018 3:59 pm
- Forum: Resonance Structures
- Topic: Coordinate covalent bond
- Replies: 2
- Views: 322
Re: Coordinate covalent bond
A coordinate covalent bond is when an element donates both of the electrons used to create a bond so all it would show is that a Lewis acid and base reacted.
- Sun May 13, 2018 9:06 pm
- Forum: Electronegativity
- Topic: Helium
- Replies: 2
- Views: 1109
Re: Helium
The noble gases do not get included in electronegativity due to the fact that they have 8 electrons already and do not need/want to attract any more. This means they wouldn't have an electronegativity by definition.
- Sun May 13, 2018 8:54 pm
- Forum: Ionic & Covalent Bonds
- Topic: Why can't hydrogen be a central atom? [ENDORSED]
- Replies: 6
- Views: 3730
Re: Why can't hydrogen be a central atom? [ENDORSED]
Since hydrogen only has one bond, it cannot form bonds with more then one other element.
- Sun May 13, 2018 8:50 pm
- Forum: Ionic & Covalent Bonds
- Topic: Periodic Trends
- Replies: 3
- Views: 431
Re: Periodic Trends
We haven't covered covalent radius yet, but for ionic radii it generally reads from right to left in a diagonally line where F is the largest.
- Sun May 06, 2018 11:35 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2763000
Re: Post All Chemistry Jokes Here
Atom: Oh my gosh I've lost a neutron!
Another atom: Don't worry, you can get a new one "free of charge".
Another atom: Don't worry, you can get a new one "free of charge".
- Sun May 06, 2018 11:33 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2763000
Re: Post All Chemistry Jokes Here
I tell bad chemistry jokes because all the good ones "argon".
- Sun May 06, 2018 11:32 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2763000
Re: Post All Chemistry Jokes Here
I try to make chemistry jokes, but generally there is no reaction.
- Sun Apr 29, 2018 4:02 pm
- Forum: Quantum Numbers and The H-Atom
- Topic: Valence electrons [ENDORSED]
- Replies: 7
- Views: 2532
Re: Valence electrons [ENDORSED]
When we fill in the electron orbitals, we have to follow Aufbau's method. This means all levels must be present, including the 3d and 4s levels.
- Sun Apr 29, 2018 3:51 pm
- Forum: Photoelectric Effect
- Topic: Photoelectric Effect Module Question [ENDORSED]
- Replies: 5
- Views: 702
Re: Photoelectric Effect Module Question [ENDORSED]
As light amplitude increases, the kinetic energy of photoelectrons remain constant. So while the amount of electrons ejected increases as amplitude of light increases, typically the light comes from ultraviolet.
- Sun Apr 29, 2018 3:45 pm
- Forum: Photoelectric Effect
- Topic: Longest and Highest Wavelength of Radiation that is able to eject an electron [ENDORSED]
- Replies: 2
- Views: 459
Re: Longest and Highest Wavelength of Radiation that is able to eject an electron [ENDORSED]
Since the maximum wavelength is the minimum energy required to eject an electron, I am pretty sure you cannot solve for shortest wavelength.
- Fri Apr 20, 2018 2:41 pm
- Forum: Student Social/Study Group
- Topic: Post All Chemistry Jokes Here
- Replies: 9651
- Views: 2763000
Re: Post All Chemistry Jokes Here
What element is a girl's future best friend?
Carbon
Carbon
- Fri Apr 20, 2018 2:38 pm
- Forum: Photoelectric Effect
- Topic: Threshold Energy [ENDORSED]
- Replies: 12
- Views: 1709
Re: Threshold Energy [ENDORSED]
A threshold energy is specifically effected by what metal you are attempting to eject an electron from. Think of threshold energy almost as ionization energy, each metal will have its own specific threshold energy to have a single electron ejected.
- Fri Apr 20, 2018 2:31 pm
- Forum: Heisenberg Indeterminacy (Uncertainty) Equation
- Topic: h-bar [ENDORSED]
- Replies: 7
- Views: 1300
Re: h-bar [ENDORSED]
Since on Test #1 we are given many formulas we did not need for that test specifically, I think we can assume h bar will not be specifically given. The formula sheet does include the value of Planck's constant and pi so you can easily use that information and your knowledge of h bar to find the valu...
- Fri Apr 13, 2018 12:04 pm
- Forum: Properties of Light
- Topic: Frequency and wavelength [ENDORSED]
- Replies: 4
- Views: 500
Re: Frequency and wavelength [ENDORSED]
Wavelength and frequency have an inverse relationship because as wavelength increase, so the waves become longer, the frequency decreases because there are less waves per second. As wavelength decreases, the waves become shorter, the frequency increases because there are more waves per second.
- Wed Apr 11, 2018 3:41 pm
- Forum: Properties of Light
- Topic: Einstein Equation
- Replies: 1
- Views: 156
Einstein Equation
I know we talked about it in class, but I am still a little confused as to the relationship between light and energy. Thanks!
- Wed Apr 11, 2018 3:34 pm
- Forum: Properties of Light
- Topic: Light Spectrum
- Replies: 2
- Views: 402
Re: Light Spectrum
We may need to know them for the test, so just in case here is a photo that list all the wavelengths and colors.
- Wed Apr 11, 2018 3:30 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Unpaired Electrons [ENDORSED]
- Replies: 3
- Views: 484
Re: Unpaired Electrons [ENDORSED]
An easy way to go about writing electron configurations is to draw a corresponding amount of lines for each subshell and fill them with arrows. Since you have to fill one level before the next, this is a systematic way to show you what the electron level is. The photo should help explain what I am t...
- Wed Apr 11, 2018 3:20 pm
- Forum: Properties of Light
- Topic: Clarification on Hz
- Replies: 5
- Views: 322
Re: Clarification on Hz
Yup...Hz is just a measurement of the frequency in which waves occur. They also have to be a complete wave cycle.
- Tue Apr 10, 2018 11:23 am
- Forum: Balancing Chemical Reactions
- Topic: Another Way to Balance
- Replies: 7
- Views: 996
Re: Another Way to Balance
Guess and check is the best way to solve these problems, but there are ways to make it easier. You can start by taking the most complex part and trying to balance that first and work your way down to single elements. In a combustion analysis it is generally easiest to start with carbon then hydrogen...
- Sun Apr 08, 2018 7:41 pm
- Forum: Balancing Chemical Reactions
- Topic: Balancing the Equation
- Replies: 9
- Views: 1143
Balancing the Equation
Is there a certain method to use for where to start when balancing an equation? I keep getting stuck when doing a problem and have to redo the coefficients multiple times. Thanks!
- Sun Apr 08, 2018 7:36 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Accuracy vs Precision
- Replies: 23
- Views: 2555
Accuracy vs Precision
I remember the example we used in class, but I am unsure how to tell which is which. One is when all measurements are close together, but not the desired amount? The other is when all the measurements are on target?