CHEMISTRY COMMUNITY

sameeksha_panda_3h

H2PO4- is! It can both accept or donate a proton

sameeksha_panda_3h

I'm not completely sure, but HSO4- is probably a more stable conjugate bas than HCO3-! In addition to other factors, the stability of the conjugate can contribute to concentration of H+ in a solution.

sameeksha_panda_3h

Hello! H and Cl are greatly attracted to each other, but the H-Cl bond is still larger than the H-O bonds in water. Furthermore, Cl is highly reactive. Together, HCl will completely dissociate in water.

sameeksha_panda_3h

For the purposes of this class, I wouldn't worry too much about figuring out which bases/ acid is stronger because the best way of "figuring it out" would be experimentally. You may be able to have an idea of how much an acid/ base would dissociate based on electronegativity differences th...

sameeksha_panda_3h

For the acids, there are in total 7 strong acids that you should just memorize: HCl, HBr, HI, HNO3, HClO3, HClO4, H2SO4. (so the rest would be weak acids). The strong bases, instead you can recognize them as they are always a metal hydroxide (e.g. LiOH, NaOH, KOH...). For the metal hydroxides (stro...

sameeksha_panda_3h

If you were given a chemical equation, you would also be able to figure out whether a substance was acidic or basic by checking to see if it received or donated a proton.

sameeksha_panda_3h

I would draw the lewis dot structure at least!

sameeksha_panda_3h

Degeneracy means that two atoms has the same amount of energy. This is important in hybridization as the lowest energy atom is the more stable structure. If there is degeneracy, there may be more than one structure found in nature (of an atom).

sameeksha_panda_3h

The best way to start any question like this is to draw the lewis dot structure! Make sure to pay attention to how many bonds each atom has with another.

sameeksha_panda_3h

When trying to determine which bond length is smaller, it's usually a question of how many bonds are between the molecules. As stated, the more bonds there are the more "tighter" and therefore closer the bond. These questions test your understanding of this concept as well as competency in...

sameeksha_panda_3h

Any bond length question would probably be similar to that on the midterm where we have to find the length of a bond for a resonance structure and therefore would average bonds based on what is given.

sameeksha_panda_3h

Hello! Thank you for the tip. I think that homework problems are the best way to study for this class (especially remember to always check your answers)! For anyone who wants extra practice, going to workshops is also a good idea. The UAs are pretty good at predicting what we need to know on the exa...

sameeksha_panda_3h

When drawing Lewis structures another way to decide which element would be in the center is checking the formal charges afterwards!

sameeksha_panda_3h

In addition to lowest ionization energy/ electronegativity, you can also double check whether the structure of a compound is best by checking the formal charges of all of the atoms.

sameeksha_panda_3h

In order for a compound to be considered an ionic compound (remember that all compounds have both ionic and covalent properties) the difference in electronegativity must be greater than 2. For BeBr2, this condition is not met. (Side note: BeBr2 is a nonpolar molecule as well).

sameeksha_panda_3h

Yeah pretty much for uncertainty, if you get a "plus or minus" some value, double it, otherwise if you're told within a certain percentage, multiply by that percentage to get y=the uncertainty.

sameeksha_panda_3h

Hello! Some of these are pretty common compounds so I would try to remember them but it isn't necessary for this class. The compounds would be given. Also, the structures for ionic compounds are different (remember from lecture that if the difference in electronegativity is greater than 2 that the c...

sameeksha_panda_3h

Zinc has a full 3d orbital which has a higher energy than 4s does, therefore it takes less energy to break up and take an electron from the 4s orbital than is does to eject an electron from the 3d orbital.

sameeksha_panda_3h

In addition to the previous answer note that linear momentum (m*v) gives not only the velocity of the object, but also takes into account the mass of an object which can affect how much force is needed for the object to accelerate as well.

sameeksha_panda_3h

For the contents of this class, nothing is faster than the speed of light so it's a good reference point to use when checking answers. If anything is going faster than 3*10^8, you should double check your work.

sameeksha_panda_3h

Idk if this answers your question but when filling up the subshells, the 4s subshells fills up before the d orbital does.

sameeksha_panda_3h

You can't use KE for wavelength because you don't know the threshold energy to find the total energy.

sameeksha_panda_3h

If you look at Heisenberg's Uncertainty Equation (uncertainty in position)(uncertainty in momentum) = a constant, therefore the two are inversely proportional to each other. This means that the more certain you are about one of the variables, the less you are about the other.

sameeksha_panda_3h

A nodal plane is an area where there is no electron density. s-orbitals do not have nodal planes which means that the distribution of electrons is even over the entire orbital. Other types of orbits have nodal planes and therefore the distribution of electrons is not even (therefore its nonsymmetric).

sameeksha_panda_3h

No, to my knowledge there isn't another variable to use, but the v for velocity and v for frequency are normally written differently (i.e the v for frequency is usually curvy-ish). However, if you want to replace v with another variable you can either write in nu as recommended before or make your o...

sameeksha_panda_3h

Along with the previous response, I think to answer your question, you can solve if given power, but you'd also need to be given the force, or be able to solve for force with outside information. I'm not sure if we'd ever get a question like that or not though because that treads more into a physics...

sameeksha_panda_3h

Yeah don't worry too much about finding the mass of the electron specifically yourself. It should be on the formula card as it's a constant.

sameeksha_panda_3h

That's pretty much it! The question is asking you to balance the weight of both sides of the scale. Assuming that the question is asking you to balance the 9 atoms of gallium (MM 70) with an x number of astatine (MM 210), you could set up the ratio equation 9/70=x/210 and cross multiply to get x=3.

sameeksha_panda_3h

Since we don't have a lab in this class the actual yield will have to be given to us. As of right now we'll mostly need it to calculate the percentage yeild (actual/theoretical- which we have to solve for!-*100%). The actual yield is what is produced by running an experiment.

sameeksha_panda_3h

I've mostly seen people use either 6.02 or 6.022 so I usually use 6.022 since it's the more accurate of the two, but as stated above the more accurate the better as you would want to try to use as many as the sig figs you want in your final answer. (I think most questions would ask for 3 sig figs if...

sameeksha_panda_3h

When answering questions I would use whatever is given either by the periodic table during the test or even the question itself! It shouldn't really matter if you use the more accurate molar mass as we have to show all of our work anyway and the answers will be very similar; but the answer any solut...

CHEMISTRY COMMUNITY

Search found 31 matches

Re: H2PO4 -

Re: H2SO4 vs H2CO3

Re: Relative acidity questions

Re: Weak Acid/Base vs. Strong

Re: Weak and Strong Acids/Bases

Re: Identifying Acids and Bases

Re: Hybridization and Electron Configurations

Re: degeneracy

Re: Homework Question

Re: 2D.13 7th edition

Re: Calculating Bond Length

Re: Studying for finals tip

Re: Ionization Energy over Electronegativity?

Re: Mystery Element

Re: Covalent or ionic?

Re: Uncertainty Principles

Re: Lewis structures of compounds

Re: Ions and Exceptions to the Octet Rule

Re: Heisenberg Uncertainity Principle

Re: Speed of Light

Re: s,p,d,f

Re: 1B 15 7th edition

Re: Uncertainty

Re: Symmetric vs. Non symmetric orbitals

Re: Variable for frequency

Re: Kinetic Energy vs Power

Re: Kinetic energy equation

Re: E3

Re: Actual yield [ENDORSED]

Re: Homework Regarding Avogadros Number

Re: Significant figures for molar mass