CHEMISTRY COMMUNITY

Isabella Zizolfi 2F

1/K is the reciprocal of K for that reaction
if you know the value of K of the forward reaction (for example 5) and the exercise asks you to find the K of the reverse reaction, you can find it by calculating the reciprocal of K of the forward reaction (in our example 1/5 which is 0.2)

Isabella Zizolfi 2F

Bronsted: H+
- Bronsted acids are proton donor
- Bronsted bases are proton acceptor

Lewis: e-
- Lewis acids are e- acceptor and they accept a lone pair
- Lewis bases are e- donor and the donate a lone pair

Isabella Zizolfi 2F

1) It is a nonmetal so this means that it forms acidic oxides
2) it takes e- so it is an electron acceptor

Isabella Zizolfi 2F

I have some problems recognizing when a acid is stronger than another acid and when a base is weaker than anther base. Can someone explain me how to do it?

Isabella Zizolfi 2F

• STRONG ACID PRODUCES MORE PROTOS IN SOLUTION THAN A WEAK ACID • STRON ACIDS ALMOST COMPLETELY IONIZED IN SOLUTION. HCl, HBr, etc. • CALCULATIONS INVOLVING STRON ACIDS (OR BASE): APPROXIMATE BY ASSUMING 100% IONIZED (DISSOCIATED) THEREFORE 0.1M HCl (Aq) IMPLIES 0.1M H3O+(Aq) AND 0.1M Cl- (Aq) WHAT ...

Isabella Zizolfi 2F

Exercise number 17.34 for point c and d. Can you tell me why the coordination number of [PtCl2(en)2]^2+ is 6 and the coordination number of [Cr(edta)]^-1 is also 6?

Isabella Zizolfi 2F

How do you determine that an atom is mono dentate? do you have to look at the lone pairs or at the bonds?

Isabella Zizolfi 2F

What do you do with a sick chemist?
if you can't helium and you can't curium, then you might as well barium

Isabella Zizolfi 2F

What is the chemical formula for banana?
BaNa2

Isabella Zizolfi 2F

Firstly I usually find the moles for each of the reactant and then through a ratio (moles of first reactant : x = stoichiometric number first reactant : stoichiometric number second reactant) I calculate the amount of moles of the second reactant I should need and then I compare the moles that I hav...

Isabella Zizolfi 2F

Bond strength and electronegativity are not really strictly related, but bond strength is more connected with the length of the atomic radius: smaller the atomic radius is, stronger the bond will be. In fact between CF4, CCl4, and CBr4, CF4 has the strongest bond because in all the three molecules w...

Isabella Zizolfi 2F

you just have to know that it describes the path/wavelength/orbital of an e- and it is a cos or sen function. You do not need to know the actual equation.

Isabella Zizolfi 2F

Electron Affinity is the energy associated with the addition of an electon to a gaseous atom. It increases from left to right (period) and decreases from the top to the bottom (group)

Isabella Zizolfi 2F

Yes, all the elements in group 11 and 6 are considered exceptions and so they act like Cr and Cu

Isabella Zizolfi 2F

l=0 --> s --> 1 orbital, 2 electrons
l=1--> p --> 3 orbitals, 6 electron
l=2 --> d --> 5 orbitals, 10 electrons
l=3 --> f --> 7 orbitals, 14 electrons

Isabella Zizolfi 2F

the answer is B because
a) you have to use the following formula in order to get the frequency --> frequency= R (1/n^2 - 1/n^2) [in this case n=4 and n=1 so frequency= R (1/16 - 1)
b) once you get the frequency you just have to use the formula wavelength= c(speed of light)/frequency

Isabella Zizolfi 2F

we know that c= frequency x wavelength. c is a constant (speed of light), so from the first formula we can get that frequency=c/wavelength, from this you can see that frequency and wavelength are inversely proportional. In fact as the value of the wavelenght increases the value of the frequency decr...

Isabella Zizolfi 2F

33. Molybdenum metal must absorb radiation with a minimum frequency of 1.09 x 1015 s-1 before it can emit an electron from its surface. What is the minimum energy needed to produce this effect? If molybdenum is irradiated with 194 nm light, what is the maximum possible kinetic energy of the emitted ...

Isabella Zizolfi 2F

28. Light hits a sodium metal surface and the velocity of the ejected electron is 6.61 x 105 m.s-1. The work function for sodium is 150.6 kJ.mol-1. How much energy is required to remove an electron from one sodium atom? What is the frequency of the incident light on the sodium metal surface? Could y...

Isabella Zizolfi 2F

Firs you have to find the empirical formula (which is C8H8O3) then you have to calculate the atom ratio (which is, in this case, 8:8:3)

Isabella Zizolfi 2F

The empirical formula shows the relative numbers of atoms of each element present in the compound (It is the simplest positive integer ratio of atoms present in a compound)
The molecular formula shows the actual numbers of atoms of each element in a molecule

CHEMISTRY COMMUNITY

Search found 21 matches

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