CHEMISTRY COMMUNITY

205793570

you are correct :) pay attention to the coefficients and the subscripts in order to properly count the number of atoms since that could really affect how you end up balancing the equation. You got the the right idea !

205793570

How do we know which element has the highest pH by just seeing their formula?
how are we able to put them from lowest to highest such as in question 10 from the achieve homework from week 10?

205793570

What differentiates a strong acid from a weak acid?
so far I just been looking at the amount of the element, however, I was wondering if there was another way?

205793570

Hi, what are the ways to differentiate a base, an acid, and a neutral elements ?

205793570

Hi, I am still confused on how to determine [H-]. the question states : Determine the [OH−] , pH, and pOH of a solution with a [H+] of 7.3×10−6 M at 25 °C.
can someone explain the steps? a simpler way to understand it?

205793570

Electron affinity:It is the energy released or needed for an atom to add an electron.
Ionization energy: It is the energy required to pull an electron from an atom.

I hope this helps! :)

205793570

Hi If a molecule is completely symmetric, then the dipole moment vectors on each molecule will cancel each other out, making the molecule nonpolar. A molecule can only be polar if the structure of that molecule is not symmetric. Hopefully this is helpful

205793570

Hi If a molecule is completely symmetric, then the dipole moment vectors on each molecule will cancel each other out, making the molecule nonpolar. A molecule can only be polar if the structure of that molecule is not symmetric. Hopefully this is helpful

205793570

Hi! according to my understanding, bond length decreases as we go across the period but it also increases as we go down. Bond length is also related to atomic radius. As the atomic radius decreases across, bond length decreases. As it increases down, bond length increases. Hopefully this helped

205793570

Hey! this is the order of strength from strongest to weakest of the various intermolecular forces ion-ion - ion-dipole - hydrogen bonding - dipole-dipole - London Dispersion Forces

205793570

Hi, I am still confused on how to calculate/classify the coordination compounds according to the combination number.
Can someone explain the steps or details that help understand it better?

205793570

The key difference between axial and equatorial position is that axial bonds are vertical while equatorial bonds are horizontal. A conformation is a shape a molecule can take due to the rotation around one or more of its bonds.

205793570

A delocalized π bond is a π bond in which the electrons are free to move over more than two nuclei.

205793570

Molecular geometry is the three-dimensional arrangement of the atoms that constitute a molecule. It includes the general shape of the molecule as well as bond lengths, bond angles, torsional angles and any other geometrical parameters that determine the position of each atom.

205793570

A sigma bond is formed by head-on overlapping of hybrid orbitals (along the bonding axis). A pi bond is formed by side-to-side overlapping of hybrid orbitals (above and below the bonding axis). It is denoted by the symbol σ. It is usually denoted by the symbol π.

205793570

Hi!, it depends on how many significant figures you would like to use. I personally would use 1.0 amu for hydrogen. If the question does not provide you with a measurement to use, I would say use 3 - 4 significant figures should be fine.

205793570

A delocalized bond is a bond that appears in some resonance forms, but not others. Resonance form I contains 2 localized bonds and 1 delocalized bond. A delocalized charge is a formal charge that appears on one atom in some resonance forms and on other atoms in other forms.

205793570

he smaller the radius, the higher the ionization energy. This is because the electrons are being held in closer to the protons, which have opposing charges and therefore hold on to them, in an atom with a small radius.

205793570

A = central atom
X = bonded pairs
E = lone pairs

205793570

Hello, hybridization is the concept of mixing atomic orbitals to form new hybrid orbitals suitable for describing bonding properties. Hybridized orbitals are very useful in explaining of the shape of molecular orbitals for molecules, and are an integral part of valence bond theory. I hope this helps...

205793570

Hi, exercising and meditating is a good way to deal with mental health, for me taking long walks while listening to music when I feel very anxious is really really helpful.

205793570

Hello, you use grams when you want to convert the value of an element or molecule into moles using the molar mass from the periodic table. The SI unit for mass is kilograms (kg). In the calculations that involve Joules (J), it is helpful to have the mass in kg because of the units. 1 J = 1 kg m^2 s^...

205793570

Hi, I was wondering if someone had a strategy on what could be the best way to differentiate a sigma bond from a Pi bond?

205793570

Hello, I was wondering if someone could explain the steps on how to solve this question: An organic compound that is distilled from wood has a molar mass of 32.04 g/mol. Its composition by mass is 37.5% carbon, 12.6% hydrogen, and 49.9% oxygen. How are we able to determine the Lewis structure with t...

205793570

Hi, It only represents lone pairs on the central atom :)

205793570

Does increased atomic radius means increased bond length and thus a weaker bond?

205793570

Hi! Yes, you are right because the difference in electronegativity between the two bonded atoms will give an indication on the extent of ionic and covalent character. If it is greater than 2 it is an ionic bond and if it is less than 1.5 it is a covalent bond :)

205793570

The most stable structure will be the structure with the formal charges that are closest to zero and the negative formal charges will be on the most electronegative elements in a stable structure.

205793570

Hi, On achieve there is information that helps explain How we determine the Oxidation number, however I was still confused, can someone explain it better?

205793570

How do we determine which element is supposed to go in the middle when we do Lewis Structures?

205793570

Yeah, it is just plugging numbers unless you work with negative numbers then you really have to pay attention to the results but other than that Is like someone else had mentioned before like a "puzzle"

205793570

The electron affinity of an atom or molecule is defined as the amount of energy released when an electron is attached to a neutral atom or molecule in the gaseous state to form a negative ion.

205793570

Hi, yes! We put the atom with the lowest ionization energy in the center when drawing Lewis Dot Structures. We do this because ionization energy is the amount of energy needed to remove an electron.

205793570

Hi, I personally do it at the very end, it has been working for me to use the 1x10^-9 when the entire calculation is done.

205793570

We do this because of the rule that each orbital can only hold 2 electrons

205793570

The E.coli bacterium is about 1.6 μm long. Suppose you want to study it using photons of that wavelength or electrons having that de Broglie wavelength.

What is the energy Ephoton of the photon?

What are the steps to solve this question?

205793570

To find the g I multiplied 15.999 by 2 then divided by 6.02214x10^23 then divided by 1000

205793570

By changing the 20 to a negative it gives me 2.6x10^-17 and it still says it is wrong. and I did divide by the correct Avogadro's number

205793570

The average speed of a diatomic oxygen molecule at 25 ∘C is 482.1 m⋅s−1 . What is the average wavelength of an oxygen molecule at this temperature? Assume that the molecule acts as a single particle. I keep doing all the steps, however it keeps saying it is wrong. I did h/(5.3x10^20)(482.1)= 2.6x10^...

205793570

I keep doing all the steps, however it keeps saying it is wrong. I did h/(5.3x10^20)(482.1)= 2.6x10^-57.
For m I did 15.999x2 and divided by 6.02214x10^23 then divided by 1000 to convert to kg
Does anyone know if I am doing anything wrong?

205793570

Hey! were you able to figure out what was wrong? I am having the same problem. I think I am doing everything right however, my answer still says it is wrong.

205793570

I am having trouble solving this question. Can someone explain the steps please?

"You use an electron microscope in which the matter wave associated with the electron beam has a wavelength of 0.0133 nm. What is the kinetic energy of an electron in the beam, expressed in electron volts?"

205793570

"The average speed of a diatomic oxygen molecule at 25 ∘C is 482.1 m⋅s−1 . What is the average wavelength of an oxygen molecule at this temperature? Assume that the molecule acts as a single particle" I know I have to use the equation wavelength=h/mv, but what does m represent? and do I ha...

205793570

This was so helpful! Thank you so much. I was wondering why does it only work with an electron in a hydrogen atom ?

205793570

Calculate the wavelength, in nanometers, of the spectral line produced when an electron in a hydrogen atom undergoes the transition from the energy level n=5 to the level n=1.

I am having trouble figuring out how to solve this problem. Does any one know the steps? or an equation for this problem?

205793570

I am not sure if I understood your question correctly but I think sketching them out and learning their structure can be helpful, like drawing them and knowing how many sides each could have.

205793570

I am probably missing a key point from the lectures but I always see that we use a 9.1x10^-31, What does it represent? when do we use exactly?

205793570

Yes! if frequency decreases then wavelength will increase and so the other way around. I get confused with it too sometimes but looking at the different equations and sketching it out helps sometimes for me.

205793570

is not possible for two electrons to have the same four quantum numbers. Two electrons can be in the same orbital, but this only corresponds to the first three quantum numbers.

205793570

Hi! I try to find the element in the chemical reaction that occurs the least. I have read that many people do it this way so I believe it does help. This is because it's easier to control the amount of times that it's occurring in the chemical equation. I feel like this is one of those type of probl...

205793570

Hi, I was planning on doing practice questions from the book and attending as many step up sessions as I could. The step up sessions have been helping me a lot to understand the material better.

205793570

In my computer there are 3 lines on the left, when you click on them, it gives you an option that says "your posts" when you click on it, it takes you to all your posts. I hope it helps

205793570

This quarter has been a little more difficult for me specially because I believe I am not very strong on the chem side, what helped you to keep pushing as a pre-med and what do you think is a must to do while in college in order to stand out during MED School applications?

205793570

Hi, I don't know if this is helpful but the speed of a wave is a product of its wavelength and frequency. Because all electromagnetic waves travel at the same speed through space, a wave with a shorter wavelength must have a higher frequency, and vice versa.

205793570

Hi,The definition of amplitude refers to the length and width of waves, in this case the height of the waves. This is just a shorter way to define it

205793570

Hi, I am having trouble with problems that contain J. What are the steps? do I have to convert anything to a different type of "measurement"? an example of what I am struggling with: A liquid is exposed to infrared radiation with a wavelength of 1.25×10−4 cm. Assume that all the radiation ...

205793570

Hi, I am having trouble with problems that contain J. What are the steps? do I have to convert anything to a different type of "measurement"? an example of what I am struggling with: A liquid is exposed to infrared radiation with a wavelength of 1.25×10−4 cm. Assume that all the radiation ...

205793570

Hi, I am having trouble with problems that contain J. What are the steps? do I have to convert anything to a different type of "measurement"? an example of what I am struggling with: A liquid is exposed to infrared radiation with a wavelength of 1.25×10−4 cm. Assume that all the radiation ...

205793570

Hi, I tried to look for the easiest way to explain it and what I came up with is: A Quanta is the minimum amount of energy required for a change and a Photon is the basic unit of all light, the smallest discrete amount or quantum of electromagnetic radiation.

205793570

Hi, I personally think going over problems from the book is very helpful, however going to the peer learning hours is what has helped me understand the material better.

205793570

Does anyone know up to how many decimals we are supposed to round or if we are supposed to answer with significant figures?

205793570

Does anyone know up to how many decimals we are supposed to round or if we are supposed to answer with significant figures?

205793570

Hi! I personally start balancing the first reactant and fist product then balance the second reactant and second product and follow from that. I believe this method is the easiest one.

205793570

Hi, qccording to the TAs, Discussions are made for practice and to answer extra questions we might have, we do not have any homework from discussions that is not posted in the CCLE page.

205793570

Hey, for me it is easier to just think about it like this:
When you move the decimal to the left you add a 1(the small #) to the 10 and when you move it to the right you add a -1 to the 10. You are able to move the decimal until you are left with just 1 number before the decimal. I hope it helps.

205793570

Is question 10 something we have learned or will learn in the future? A reaction was performed in which 0.45 mL of 2‑butanone was reacted with an excess of propyl magnesiumbromide to make 0.441 g of 3‑methyl‑3‑hexanol. Calculate the theoretical yield and percent yield for this reaction. Does "2...

Search found 66 matches