Search found 32 matches

by Caroline Crotty 1D
Wed Jun 13, 2018 4:22 pm
Forum: Identifying Acidic & Basic Salts
Topic: Salts of weak bases and acids
Replies: 1
Views: 149

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.
by Caroline Crotty 1D
Wed Jun 13, 2018 4:14 pm
Forum: Lewis Acids & Bases
Topic: Determine Lewis Acid
Replies: 13
Views: 536

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.
by Caroline Crotty 1D
Wed Jun 13, 2018 4:10 pm
Forum: Lewis Acids & Bases
Topic: identifying strong acids
Replies: 2
Views: 223

Re: identifying strong acids

There are 6 main strong acids and they are:

HI
HBr
HCl
HClO4
H2SO4
HNO3
by Caroline Crotty 1D
Sat Jun 02, 2018 12:25 pm
Forum: Shape, Structure, Coordination Number, Ligands
Topic: Tetrahedral and Square planar
Replies: 8
Views: 363

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.
by Caroline Crotty 1D
Sat Jun 02, 2018 12:22 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 7
Views: 228

Re: Bond Angles

We just need to know the main bond angles associated with molecular shapes for the test.
by Caroline Crotty 1D
Sat Jun 02, 2018 12:14 pm
Forum: Hybridization
Topic: basics of hybridization
Replies: 18
Views: 568

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.
by Caroline Crotty 1D
Sat Jun 02, 2018 12:05 pm
Forum: Hybridization
Topic: VSEPR
Replies: 11
Views: 472

Re: VSEPR

The VSEPR model is used to predict the geometry of individual molecules from the number of electron pairs surrounding their central atoms.
by Caroline Crotty 1D
Sat Jun 02, 2018 12:01 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Valence Bond Theory
Replies: 2
Views: 228

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.
by Caroline Crotty 1D
Sat Jun 02, 2018 11:58 am
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Double bond
Replies: 5
Views: 264

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.
by Caroline Crotty 1D
Wed May 16, 2018 4:15 pm
Forum: Lewis Structures
Topic: Central atom
Replies: 7
Views: 211

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.
by Caroline Crotty 1D
Wed May 16, 2018 4:12 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 903464

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.
by Caroline Crotty 1D
Wed May 16, 2018 3:59 pm
Forum: Resonance Structures
Topic: Coordinate covalent bond
Replies: 2
Views: 112

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.
by Caroline Crotty 1D
Sun May 13, 2018 9:06 pm
Forum: Electronegativity
Topic: Helium
Replies: 2
Views: 205

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.
by Caroline Crotty 1D
Sun May 13, 2018 8:54 pm
Forum: Ionic & Covalent Bonds
Topic: Why can't hydrogen be a central atom? [ENDORSED]
Replies: 6
Views: 299

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.
by Caroline Crotty 1D
Sun May 13, 2018 8:50 pm
Forum: Ionic & Covalent Bonds
Topic: Periodic Trends
Replies: 3
Views: 126

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.
by Caroline Crotty 1D
Sun May 06, 2018 11:35 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 903464

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".
by Caroline Crotty 1D
Sun May 06, 2018 11:33 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 903464

Re: Post All Chemistry Jokes Here

I tell bad chemistry jokes because all the good ones "argon".
by Caroline Crotty 1D
Sun May 06, 2018 11:32 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 903464

Re: Post All Chemistry Jokes Here

I try to make chemistry jokes, but generally there is no reaction.
by Caroline Crotty 1D
Sun Apr 29, 2018 4:02 pm
Forum: Quantum Numbers and The H-Atom
Topic: Valence electrons [ENDORSED]
Replies: 7
Views: 397

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.
by Caroline Crotty 1D
Sun Apr 29, 2018 3:51 pm
Forum: Photoelectric Effect
Topic: Photoelectric Effect Module Question [ENDORSED]
Replies: 5
Views: 260

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.
by Caroline Crotty 1D
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: 120

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.
by Caroline Crotty 1D
Fri Apr 20, 2018 2:41 pm
Forum: Student Social/Study Group
Topic: Post All Chemistry Jokes Here
Replies: 7348
Views: 903464

Re: Post All Chemistry Jokes Here

What element is a girl's future best friend?
Carbon
by Caroline Crotty 1D
Fri Apr 20, 2018 2:38 pm
Forum: Photoelectric Effect
Topic: Threshold Energy [ENDORSED]
Replies: 12
Views: 339

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.
by Caroline Crotty 1D
Fri Apr 20, 2018 2:31 pm
Forum: Heisenberg Indeterminacy (Uncertainty) Equation
Topic: h-bar [ENDORSED]
Replies: 7
Views: 243

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...
by Caroline Crotty 1D
Fri Apr 13, 2018 12:04 pm
Forum: Properties of Light
Topic: Frequency and wavelength [ENDORSED]
Replies: 4
Views: 133

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.
by Caroline Crotty 1D
Wed Apr 11, 2018 3:41 pm
Forum: Properties of Light
Topic: Einstein Equation
Replies: 1
Views: 82

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!
by Caroline Crotty 1D
Wed Apr 11, 2018 3:34 pm
Forum: Properties of Light
Topic: Light Spectrum
Replies: 2
Views: 160

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.

Wavelengths.jpg
by Caroline Crotty 1D
Wed Apr 11, 2018 3:30 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Unpaired Electrons [ENDORSED]
Replies: 3
Views: 272

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...
by Caroline Crotty 1D
Wed Apr 11, 2018 3:20 pm
Forum: Properties of Light
Topic: Clarification on Hz
Replies: 5
Views: 158

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.
by Caroline Crotty 1D
Tue Apr 10, 2018 11:23 am
Forum: Balancing Chemical Reactions
Topic: Another Way to Balance
Replies: 7
Views: 236

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...
by Caroline Crotty 1D
Sun Apr 08, 2018 7:41 pm
Forum: Balancing Chemical Reactions
Topic: Balancing the Equation
Replies: 9
Views: 371

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!
by Caroline Crotty 1D
Sun Apr 08, 2018 7:36 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Accuracy vs Precision
Replies: 23
Views: 704

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?

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