Search found 50 matches
- Sun Dec 08, 2019 10:20 pm
- Forum: Resonance Structures
- Topic: Bond lengths
- Replies: 2
- Views: 155
Bond lengths
Why is it that when you have a molecule that exhibits resonance (e.g. has a double bond and a single bond), the actual bond length is one and a half instead of a double or single bond?
- Sun Dec 08, 2019 10:18 pm
- Forum: *Titrations & Titration Calculations
- Topic: Type of Titration
- Replies: 3
- Views: 120
Type of Titration
How do you know if a titration is acidic, basic, or neutral?
- Sun Dec 08, 2019 10:17 pm
- Forum: Identifying Acidic & Basic Salts
- Topic: Types of Salts
- Replies: 7
- Views: 234
Types of Salts
Is there such a thing as a strong salt and weak salt?
- Sun Dec 08, 2019 10:17 pm
- Forum: Acidity & Basicity Constants and The Conjugate Seesaw
- Topic: pKa and pKb
- Replies: 2
- Views: 136
pKa and pKb
I know pKa and pKb help us see how acidic or basic compounds are, but do they actually mean?
- Sun Dec 08, 2019 10:15 pm
- Forum: Naming
- Topic: Types of Compounds
- Replies: 2
- Views: 115
Types of Compounds
How do you know if a compound is ionic or covalent?
- Sun Dec 01, 2019 11:04 pm
- Forum: Hybridization
- Topic: Electronegativity
- Replies: 4
- Views: 73
Electronegativity
Does electronegativity play any role in hybridization?
- Sun Dec 01, 2019 10:52 pm
- Forum: Resonance Structures
- Topic: Carbon
- Replies: 4
- Views: 162
Carbon
Can carbon ever exceed the octet in these structures?
- Sun Dec 01, 2019 10:50 pm
- Forum: Lewis Acids & Bases
- Topic: Conjugates
- Replies: 3
- Views: 49
Conjugates
What's a conjugate base and acid?
- Sun Dec 01, 2019 10:42 pm
- Forum: Ionic & Covalent Bonds
- Topic: Carbon
- Replies: 4
- Views: 220
Carbon
Why can't two carbons just create four covalent bonds with each other?
- Sun Dec 01, 2019 10:36 pm
- Forum: Sigma & Pi Bonds
- Topic: Sigma vs. Pi
- Replies: 20
- Views: 470
Sigma vs. Pi
Theoretically, would a single sigma bond or a single pi bond be stronger?
- Sun Nov 24, 2019 11:42 pm
- Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
- Topic: Bond Order
- Replies: 11
- Views: 201
Bond Order
What happens if the bond order is zero?
- Sun Nov 24, 2019 11:40 pm
- Forum: Resonance Structures
- Topic: Resonance vs Isomers
- Replies: 2
- Views: 124
Resonance vs Isomers
Is a different resonance structure the same thing as an isomer?
- Sun Nov 24, 2019 11:39 pm
- Forum: Electronegativity
- Topic: Hydrogen
- Replies: 6
- Views: 178
Hydrogen
Why isn't hydrogen the most electronegative element, compared to others like fluorine?
- Sun Nov 24, 2019 11:21 pm
- Forum: Naming
- Topic: Roman numerals
- Replies: 6
- Views: 94
Roman numerals
When are we supposed to use Roman numerals when naming compounds?
- Sun Nov 24, 2019 11:18 pm
- Forum: Formal Charge and Oxidation Numbers
- Topic: Ions
- Replies: 3
- Views: 177
Ions
Can only certain groups of elements be ions?
- Sun Nov 17, 2019 8:17 pm
- Forum: Electronegativity
- Topic: More electronegative?
- Replies: 3
- Views: 140
More electronegative?
Why is oxygen more electronegative than chlorine? They're both in an awkward spot on the periodic table.
- Sun Nov 17, 2019 6:36 pm
- Forum: Electronegativity
- Topic: Electron affinity
- Replies: 2
- Views: 147
Electron affinity
What's the difference between electronegativity and electron affinity?
- Sun Nov 17, 2019 6:02 pm
- Forum: Dipole Moments
- Topic: SCl4 Molecule
- Replies: 5
- Views: 60
SCl4 Molecule
Why don't the dipole moments in SCl4 cancel each other out?
- Sun Nov 17, 2019 5:59 pm
- Forum: Lewis Structures
- Topic: Noble gases
- Replies: 3
- Views: 91
Noble gases
Why would a noble gas like xenon form a covalent bond? It's valence shell is already full.
- Sun Nov 17, 2019 5:54 pm
- Forum: Hybridization
- Topic: Orbitals
- Replies: 1
- Views: 32
Orbitals
Do all of the orbitals in an atom become hybridized during bonding?
- Sun Nov 10, 2019 7:34 pm
- Forum: Ionic & Covalent Bonds
- Topic: Both types of bonds
- Replies: 6
- Views: 83
Both types of bonds
Is it possible for a bond between two atoms to be both ionic and covalent at the same time?
- Sun Nov 10, 2019 7:23 pm
- Forum: Determining Molecular Shape (VSEPR)
- Topic: Bond Angles
- Replies: 2
- Views: 32
Bond Angles
Why do molecules have specific bond angles? Is it something to do with the electrons?
- Sun Nov 10, 2019 7:21 pm
- Forum: Resonance Structures
- Topic: Point of Resonance Structures
- Replies: 2
- Views: 60
Point of Resonance Structures
If the different resonance structures we draw for a certain atom don't actually exist, why do we bother drawing them?
- Sun Nov 10, 2019 7:18 pm
- Forum: Dipole Moments
- Topic: Temporary Dipole Moment?
- Replies: 4
- Views: 45
Temporary Dipole Moment?
Is it possible to have a temporary dipole moment? Or are they permanent?
- Sun Nov 10, 2019 7:13 pm
- Forum: Hybridization
- Topic: Why is hybridization necessary?
- Replies: 3
- Views: 47
Why is hybridization necessary?
Why can't atoms form bonds without hybridizing?
- Sun Nov 03, 2019 10:53 am
- Forum: Electronegativity
- Topic: Noble Gases and Electronegativity
- Replies: 3
- Views: 47
Noble Gases and Electronegativity
Since noble gases don't want more electrons, does it mean that they have low electronegativity, or none at all?
- Sun Nov 03, 2019 10:47 am
- Forum: Resonance Structures
- Topic: All Molecules?
- Replies: 4
- Views: 76
All Molecules?
Do all molecules have resonance structures?
- Sun Nov 03, 2019 10:15 am
- Forum: Resonance Structures
- Topic: Resonance Stability
- Replies: 3
- Views: 47
Resonance Stability
When a molecule has resonance, is it more stable than one without resonance?
- Sun Nov 03, 2019 10:11 am
- Forum: Bond Lengths & Energies
- Topic: Bond Strength
- Replies: 6
- Views: 85
Re: Bond Strength
They're stronger because the atoms are much closer to each other, having a smaller atomic radii. Because they're closer to each other they have stronger bonding between their electrons.
- Sun Nov 03, 2019 10:07 am
- Forum: Trends in The Periodic Table
- Topic: Exceptions
- Replies: 4
- Views: 35
Re: Exceptions
Boron also has a lower ionization energy than Beryllium since Beryllium is more stable (therefore requires more energy to take an electron away).
- Sun Oct 27, 2019 8:51 pm
- Forum: Electronegativity
- Topic: Polarity
- Replies: 5
- Views: 69
Polarity
Is electronegativity the same thing as polarity, or is it correlated?
- Sun Oct 27, 2019 8:47 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Chromium and Copper
- Replies: 5
- Views: 62
Re: Chromium and Copper
Some atoms, like Chromium and Copper, are more stable when their shells or sub-shells are half-filled/filled with electrons, rather than almost half-filled/filled. These atoms are more stable this way, reaching an overall lower state of energy.
- Sun Oct 27, 2019 6:09 pm
- Forum: Electronegativity
- Topic: Electronegativity in Covalent Bonds
- Replies: 3
- Views: 49
Electronegativity in Covalent Bonds
Is electronegativity only applicable to covalent bonds, or can it be applied to other types of bonds?
- Sun Oct 27, 2019 6:03 pm
- Forum: Photoelectric Effect
- Topic: Increasing Light Intensity Photoelectric Effect
- Replies: 7
- Views: 94
Re: Increasing Light Intensity Photoelectric Effect
Doubling the intensity (amplitude) will double the amount of electrons emitted from the metal, but it won't change the kinetic energy of those electrons.
- Sun Oct 27, 2019 1:30 pm
- Forum: Ionic & Covalent Bonds
- Topic: Writing Electron Configurations for an Ion
- Replies: 6
- Views: 88
Re: Writing Electron Configurations for an Ion
Yes that would be right. An ion is basically just a neutral atom with electrons either taken away or added. So when writing the electron configuration for an ion, you would start removing or adding valence electrons from the neutral electron configuration.
- Sun Oct 20, 2019 9:49 pm
- Forum: Wave Functions and s-, p-, d-, f- Orbitals
- Topic: Ground State
- Replies: 5
- Views: 91
Re: Ground State
When an atom is in its ground state, that is when all electrons are in their lowest energy levels. This means that the electrons cannot be moved to a different orbital without increasing the overall energy of the atom.
- Sun Oct 20, 2019 9:44 pm
- Forum: Photoelectric Effect
- Topic: Speed of Light
- Replies: 29
- Views: 385
Re: Speed of Light
The speed of light is a constant, as seen through experimental data. For which version of the speed of light to use, my TA said to usually use 3.00*10^8 m/s, unless the constant/equation sheet or problem you are given says another number instead.
- Sun Oct 20, 2019 9:41 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Paired & Parallel Electrons
- Replies: 4
- Views: 44
Re: Paired & Parallel Electrons
When electrons are parallel to each other, they have the same spin, while paired electrons have opposite spins. Electrons are unpaired first, and then once more electrons are added, they will get paired.
- Sun Oct 20, 2019 9:24 pm
- Forum: Electron Configurations for Multi-Electron Atoms
- Topic: Exceptions within P.t.
- Replies: 2
- Views: 28
Re: Exceptions within P.t.
A sub-level that is exactly half-way filled is more stable than one that is only partially filled. Electrons want to go into what is the lowest energy state, which is when the electrons are stable. And I'm not sure about the other elements other than Cr and Cu.
- Sun Oct 20, 2019 9:20 pm
- Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
- Topic: Kinetic Energy
- Replies: 4
- Views: 91
Re: Kinetic Energy
Kinetic energy is equal to (1/2)mv^2, so the result must always be either positive or zero (which would be if either v or m were equal to 0).
- Sun Oct 13, 2019 10:56 pm
- Forum: Properties of Electrons
- Topic: Emission Spectrum
- Replies: 4
- Views: 62
Re: Emission Spectrum
Spectral lines are a series of lines on an atomic spectrum, which can either be due to the absorption or emission of light shone upon the atom. It is basically just like a fingerprint, except for atoms.
- Sun Oct 13, 2019 10:01 pm
- Forum: Photoelectric Effect
- Topic: electrons
- Replies: 2
- Views: 71
Re: electrons
Electrons (aka light) is seen as a wave due to the fact that it can behave like a wave, in which light can reflect, diffract, etc. just like a wave. In the photoelectric effect, if light were to react exactly like a wave, simply increasing the intensity of a wave (increasing its energy) would allow ...
- Sun Oct 13, 2019 8:54 pm
- Forum: Properties of Light
- Topic: Frequency vs. Intensity
- Replies: 4
- Views: 37
Re: Frequency vs. Intensity
The intensity of light is determined by how many photons are within it. Frequency is determined by how much energy is in the wave.
For example, in the photoelectric effect, it doesn't matter how many photons are striking a metal, but rather how high the frequency is.
For example, in the photoelectric effect, it doesn't matter how many photons are striking a metal, but rather how high the frequency is.
- Sun Oct 13, 2019 8:51 pm
- Forum: Properties of Light
- Topic: Wavelength
- Replies: 3
- Views: 36
Re: Wavelength
A shorter wavelength means that there is going to be a higher frequency. Looking at the equation E = hf, when you increase the frequency, the energy also increases.
- Sun Oct 13, 2019 11:55 am
- Forum: Properties of Electrons
- Topic: wave properties of electrons
- Replies: 5
- Views: 62
Re: wave properties of electrons
Constructive interference is when two waves are added together to create a wave that is higher in amplitude. Destructive interference is when two waves are added together, but then create a wave that in lower in amplitude. To get constructive interference, the peaks of one wave have to match those o...
- Sun Oct 06, 2019 8:15 pm
- Forum: Properties of Light
- Topic: Incident Light
- Replies: 2
- Views: 31
Re: Incident Light
Incident light is light that falls upon an object. For example, if you were to shine a flashlight upon a mirror, the light coming from the flashlight is the incident light, while the subsequent light created from the mirror is reflected light.
- Sun Oct 06, 2019 8:04 pm
- Forum: Significant Figures
- Topic: When do zeros count?
- Replies: 5
- Views: 89
Re: When do zeros count?
1.00 has 3 sig figs because there is a decimal point. When there's that decimal point, it means that we are certain that the number 1.00 is within a hundredths place of the actual value. 0.01 only has 1 sig fig because it contains leading zeroes. If you had 0.0000000001, it would still have only 1 s...
- Sun Oct 06, 2019 8:01 pm
- Forum: Balancing Chemical Reactions
- Topic: Combustion
- Replies: 17
- Views: 629
Combustion
What exactly is combustion, and how are we supposed to represent it in a chemical equation?
- Sun Oct 06, 2019 7:47 pm
- Forum: Accuracy, Precision, Mole, Other Definitions
- Topic: Homework E19
- Replies: 1
- Views: 168
Re: Homework E19
To find the density of a single water molecule, you have to use Avogadro's constant. There are 6.022x10^23 molecules of H2O in 18.0158 g of water. Then you divide that molar mass (18.0158 g) by Avogadro's constant to get the mass of one water molecule (~ 2.99×10^-23 g). The density of water is 1 g/m...
- Sun Oct 06, 2019 7:35 pm
- Forum: Significant Figures
- Topic: Number of significant figures
- Replies: 5
- Views: 106
Re: Number of significant figures
Whenever doing calculations you want to make sure that your final answer is no more precise than the least precise answer. For example, when doing 6.23 + 4.5613, the answer won't be 10.7913, but rather 10.79. 6.23 is the least precise number within the calculations, so your final answer needs to ref...