Search found 50 matches

by Lelija Kazlauskas 3J
Sun Dec 08, 2019 10:20 pm
Forum: Resonance Structures
Topic: Bond lengths
Replies: 2
Views: 132

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?
by Lelija Kazlauskas 3J
Sun Dec 08, 2019 10:18 pm
Forum: *Titrations & Titration Calculations
Topic: Type of Titration
Replies: 3
Views: 103

Type of Titration

How do you know if a titration is acidic, basic, or neutral?
by Lelija Kazlauskas 3J
Sun Dec 08, 2019 10:17 pm
Forum: Identifying Acidic & Basic Salts
Topic: Types of Salts
Replies: 4
Views: 152

Types of Salts

Is there such a thing as a strong salt and weak salt?
by Lelija Kazlauskas 3J
Sun Dec 08, 2019 10:17 pm
Forum: Acidity & Basicity Constants and The Conjugate Seesaw
Topic: pKa and pKb
Replies: 2
Views: 112

pKa and pKb

I know pKa and pKb help us see how acidic or basic compounds are, but do they actually mean?
by Lelija Kazlauskas 3J
Sun Dec 08, 2019 10:15 pm
Forum: Naming
Topic: Types of Compounds
Replies: 2
Views: 100

Types of Compounds

How do you know if a compound is ionic or covalent?
by Lelija Kazlauskas 3J
Sun Dec 01, 2019 11:04 pm
Forum: Hybridization
Topic: Electronegativity
Replies: 1
Views: 27

Electronegativity

Does electronegativity play any role in hybridization?
by Lelija Kazlauskas 3J
Sun Dec 01, 2019 10:52 pm
Forum: Resonance Structures
Topic: Carbon
Replies: 4
Views: 153

Carbon

Can carbon ever exceed the octet in these structures?
by Lelija Kazlauskas 3J
Sun Dec 01, 2019 10:50 pm
Forum: Lewis Acids & Bases
Topic: Conjugates
Replies: 3
Views: 28

Conjugates

What's a conjugate base and acid?
by Lelija Kazlauskas 3J
Sun Dec 01, 2019 10:42 pm
Forum: Ionic & Covalent Bonds
Topic: Carbon
Replies: 4
Views: 172

Carbon

Why can't two carbons just create four covalent bonds with each other?
by Lelija Kazlauskas 3J
Sun Dec 01, 2019 10:36 pm
Forum: Sigma & Pi Bonds
Topic: Sigma vs. Pi
Replies: 15
Views: 369

Sigma vs. Pi

Theoretically, would a single sigma bond or a single pi bond be stronger?
by Lelija Kazlauskas 3J
Sun Nov 24, 2019 11:42 pm
Forum: *Molecular Orbital Theory (Bond Order, Diamagnetism, Paramagnetism)
Topic: Bond Order
Replies: 2
Views: 89

Bond Order

What happens if the bond order is zero?
by Lelija Kazlauskas 3J
Sun Nov 24, 2019 11:40 pm
Forum: Resonance Structures
Topic: Resonance vs Isomers
Replies: 2
Views: 116

Resonance vs Isomers

Is a different resonance structure the same thing as an isomer?
by Lelija Kazlauskas 3J
Sun Nov 24, 2019 11:39 pm
Forum: Electronegativity
Topic: Hydrogen
Replies: 6
Views: 156

Hydrogen

Why isn't hydrogen the most electronegative element, compared to others like fluorine?
by Lelija Kazlauskas 3J
Sun Nov 24, 2019 11:21 pm
Forum: Naming
Topic: Roman numerals
Replies: 6
Views: 51

Roman numerals

When are we supposed to use Roman numerals when naming compounds?
by Lelija Kazlauskas 3J
Sun Nov 24, 2019 11:18 pm
Forum: Formal Charge and Oxidation Numbers
Topic: Ions
Replies: 3
Views: 154

Ions

Can only certain groups of elements be ions?
by Lelija Kazlauskas 3J
Sun Nov 17, 2019 8:17 pm
Forum: Electronegativity
Topic: More electronegative?
Replies: 3
Views: 129

More electronegative?

Why is oxygen more electronegative than chlorine? They're both in an awkward spot on the periodic table.
by Lelija Kazlauskas 3J
Sun Nov 17, 2019 6:36 pm
Forum: Electronegativity
Topic: Electron affinity
Replies: 2
Views: 131

Electron affinity

What's the difference between electronegativity and electron affinity?
by Lelija Kazlauskas 3J
Sun Nov 17, 2019 6:02 pm
Forum: Dipole Moments
Topic: SCl4 Molecule
Replies: 5
Views: 52

SCl4 Molecule

Why don't the dipole moments in SCl4 cancel each other out?
by Lelija Kazlauskas 3J
Sun Nov 17, 2019 5:59 pm
Forum: Lewis Structures
Topic: Noble gases
Replies: 3
Views: 77

Noble gases

Why would a noble gas like xenon form a covalent bond? It's valence shell is already full.
by Lelija Kazlauskas 3J
Sun Nov 17, 2019 5:54 pm
Forum: Hybridization
Topic: Orbitals
Replies: 1
Views: 30

Orbitals

Do all of the orbitals in an atom become hybridized during bonding?
by Lelija Kazlauskas 3J
Sun Nov 10, 2019 7:34 pm
Forum: Ionic & Covalent Bonds
Topic: Both types of bonds
Replies: 6
Views: 67

Both types of bonds

Is it possible for a bond between two atoms to be both ionic and covalent at the same time?
by Lelija Kazlauskas 3J
Sun Nov 10, 2019 7:23 pm
Forum: Determining Molecular Shape (VSEPR)
Topic: Bond Angles
Replies: 2
Views: 30

Bond Angles

Why do molecules have specific bond angles? Is it something to do with the electrons?
by Lelija Kazlauskas 3J
Sun Nov 10, 2019 7:21 pm
Forum: Resonance Structures
Topic: Point of Resonance Structures
Replies: 2
Views: 52

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?
by Lelija Kazlauskas 3J
Sun Nov 10, 2019 7:18 pm
Forum: Dipole Moments
Topic: Temporary Dipole Moment?
Replies: 4
Views: 41

Temporary Dipole Moment?

Is it possible to have a temporary dipole moment? Or are they permanent?
by Lelija Kazlauskas 3J
Sun Nov 10, 2019 7:13 pm
Forum: Hybridization
Topic: Why is hybridization necessary?
Replies: 3
Views: 39

Why is hybridization necessary?

Why can't atoms form bonds without hybridizing?
by Lelija Kazlauskas 3J
Sun Nov 03, 2019 10:53 am
Forum: Electronegativity
Topic: Noble Gases and Electronegativity
Replies: 3
Views: 35

Noble Gases and Electronegativity

Since noble gases don't want more electrons, does it mean that they have low electronegativity, or none at all?
by Lelija Kazlauskas 3J
Sun Nov 03, 2019 10:47 am
Forum: Resonance Structures
Topic: All Molecules?
Replies: 4
Views: 56

All Molecules?

Do all molecules have resonance structures?
by Lelija Kazlauskas 3J
Sun Nov 03, 2019 10:15 am
Forum: Resonance Structures
Topic: Resonance Stability
Replies: 3
Views: 44

Resonance Stability

When a molecule has resonance, is it more stable than one without resonance?
by Lelija Kazlauskas 3J
Sun Nov 03, 2019 10:11 am
Forum: Bond Lengths & Energies
Topic: Bond Strength
Replies: 6
Views: 58

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.
by Lelija Kazlauskas 3J
Sun Nov 03, 2019 10:07 am
Forum: Trends in The Periodic Table
Topic: Exceptions
Replies: 4
Views: 34

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).
by Lelija Kazlauskas 3J
Sun Oct 27, 2019 8:51 pm
Forum: Electronegativity
Topic: Polarity
Replies: 5
Views: 63

Polarity

Is electronegativity the same thing as polarity, or is it correlated?
by Lelija Kazlauskas 3J
Sun Oct 27, 2019 8:47 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Chromium and Copper
Replies: 5
Views: 55

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.
by Lelija Kazlauskas 3J
Sun Oct 27, 2019 6:09 pm
Forum: Electronegativity
Topic: Electronegativity in Covalent Bonds
Replies: 3
Views: 45

Electronegativity in Covalent Bonds

Is electronegativity only applicable to covalent bonds, or can it be applied to other types of bonds?
by Lelija Kazlauskas 3J
Sun Oct 27, 2019 6:03 pm
Forum: Photoelectric Effect
Topic: Increasing Light Intensity Photoelectric Effect
Replies: 7
Views: 88

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.
by Lelija Kazlauskas 3J
Sun Oct 27, 2019 1:30 pm
Forum: Ionic & Covalent Bonds
Topic: Writing Electron Configurations for an Ion
Replies: 6
Views: 77

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.
by Lelija Kazlauskas 3J
Sun Oct 20, 2019 9:49 pm
Forum: Wave Functions and s-, p-, d-, f- Orbitals
Topic: Ground State
Replies: 5
Views: 83

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.
by Lelija Kazlauskas 3J
Sun Oct 20, 2019 9:44 pm
Forum: Photoelectric Effect
Topic: Speed of Light
Replies: 29
Views: 325

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.
by Lelija Kazlauskas 3J
Sun Oct 20, 2019 9:41 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Paired & Parallel Electrons
Replies: 4
Views: 36

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.
by Lelija Kazlauskas 3J
Sun Oct 20, 2019 9:24 pm
Forum: Electron Configurations for Multi-Electron Atoms
Topic: Exceptions within P.t.
Replies: 2
Views: 27

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.
by Lelija Kazlauskas 3J
Sun Oct 20, 2019 9:20 pm
Forum: Bohr Frequency Condition, H-Atom , Atomic Spectroscopy
Topic: Kinetic Energy
Replies: 4
Views: 82

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).
by Lelija Kazlauskas 3J
Sun Oct 13, 2019 10:56 pm
Forum: Properties of Electrons
Topic: Emission Spectrum
Replies: 4
Views: 51

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.
by Lelija Kazlauskas 3J
Sun Oct 13, 2019 10:01 pm
Forum: Photoelectric Effect
Topic: electrons
Replies: 2
Views: 60

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 ...
by Lelija Kazlauskas 3J
Sun Oct 13, 2019 8:54 pm
Forum: Properties of Light
Topic: Frequency vs. Intensity
Replies: 4
Views: 35

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.
by Lelija Kazlauskas 3J
Sun Oct 13, 2019 8:51 pm
Forum: Properties of Light
Topic: Wavelength
Replies: 3
Views: 25

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.
by Lelija Kazlauskas 3J
Sun Oct 13, 2019 11:55 am
Forum: Properties of Electrons
Topic: wave properties of electrons
Replies: 5
Views: 55

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...
by Lelija Kazlauskas 3J
Sun Oct 06, 2019 8:15 pm
Forum: Properties of Light
Topic: Incident Light
Replies: 2
Views: 26

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.
by Lelija Kazlauskas 3J
Sun Oct 06, 2019 8:04 pm
Forum: Significant Figures
Topic: When do zeros count?
Replies: 5
Views: 82

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...
by Lelija Kazlauskas 3J
Sun Oct 06, 2019 8:01 pm
Forum: Balancing Chemical Reactions
Topic: Combustion
Replies: 17
Views: 579

Combustion

What exactly is combustion, and how are we supposed to represent it in a chemical equation?
by Lelija Kazlauskas 3J
Sun Oct 06, 2019 7:47 pm
Forum: Accuracy, Precision, Mole, Other Definitions
Topic: Homework E19
Replies: 1
Views: 156

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...
by Lelija Kazlauskas 3J
Sun Oct 06, 2019 7:35 pm
Forum: Significant Figures
Topic: Number of significant figures
Replies: 5
Views: 62

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...

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