CHEMISTRY COMMUNITY

Lelija Kazlauskas 3J

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?

Lelija Kazlauskas 3J

How do you know if a titration is acidic, basic, or neutral?

Lelija Kazlauskas 3J

Is there such a thing as a strong salt and weak salt?

Lelija Kazlauskas 3J

I know pKa and pKb help us see how acidic or basic compounds are, but do they actually mean?

Lelija Kazlauskas 3J

How do you know if a compound is ionic or covalent?

Lelija Kazlauskas 3J

Does electronegativity play any role in hybridization?

Lelija Kazlauskas 3J

Can carbon ever exceed the octet in these structures?

Lelija Kazlauskas 3J

What's a conjugate base and acid?

Lelija Kazlauskas 3J

Why can't two carbons just create four covalent bonds with each other?

Lelija Kazlauskas 3J

Theoretically, would a single sigma bond or a single pi bond be stronger?

Lelija Kazlauskas 3J

What happens if the bond order is zero?

Lelija Kazlauskas 3J

Is a different resonance structure the same thing as an isomer?

Lelija Kazlauskas 3J

Why isn't hydrogen the most electronegative element, compared to others like fluorine?

Lelija Kazlauskas 3J

When are we supposed to use Roman numerals when naming compounds?

Lelija Kazlauskas 3J

Can only certain groups of elements be ions?

Lelija Kazlauskas 3J

Why is oxygen more electronegative than chlorine? They're both in an awkward spot on the periodic table.

Lelija Kazlauskas 3J

What's the difference between electronegativity and electron affinity?

Lelija Kazlauskas 3J

Why don't the dipole moments in SCl4 cancel each other out?

Lelija Kazlauskas 3J

Why would a noble gas like xenon form a covalent bond? It's valence shell is already full.

Lelija Kazlauskas 3J

Do all of the orbitals in an atom become hybridized during bonding?

Lelija Kazlauskas 3J

Is it possible for a bond between two atoms to be both ionic and covalent at the same time?

Lelija Kazlauskas 3J

Why do molecules have specific bond angles? Is it something to do with the electrons?

Lelija Kazlauskas 3J

If the different resonance structures we draw for a certain atom don't actually exist, why do we bother drawing them?

Lelija Kazlauskas 3J

Is it possible to have a temporary dipole moment? Or are they permanent?

Lelija Kazlauskas 3J

Why can't atoms form bonds without hybridizing?

Lelija Kazlauskas 3J

Since noble gases don't want more electrons, does it mean that they have low electronegativity, or none at all?

Lelija Kazlauskas 3J

Do all molecules have resonance structures?

Lelija Kazlauskas 3J

When a molecule has resonance, is it more stable than one without resonance?

Lelija Kazlauskas 3J

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.

Lelija Kazlauskas 3J

Boron also has a lower ionization energy than Beryllium since Beryllium is more stable (therefore requires more energy to take an electron away).

Lelija Kazlauskas 3J

Is electronegativity the same thing as polarity, or is it correlated?

Lelija Kazlauskas 3J

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.

Lelija Kazlauskas 3J

Is electronegativity only applicable to covalent bonds, or can it be applied to other types of bonds?

Lelija Kazlauskas 3J

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.

Lelija Kazlauskas 3J

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.

Lelija Kazlauskas 3J

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.

Lelija Kazlauskas 3J

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.

Lelija Kazlauskas 3J

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.

Lelija Kazlauskas 3J

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.

Lelija Kazlauskas 3J

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).

Lelija Kazlauskas 3J

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.

Lelija Kazlauskas 3J

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 ...

Lelija Kazlauskas 3J

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.

Lelija Kazlauskas 3J

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.

Lelija Kazlauskas 3J

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...

Lelija Kazlauskas 3J

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.

Lelija Kazlauskas 3J

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...

Lelija Kazlauskas 3J

What exactly is combustion, and how are we supposed to represent it in a chemical equation?

Lelija Kazlauskas 3J

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...

Lelija Kazlauskas 3J

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...

Search found 50 matches