Answer:
pH= 2.199971 is the correct answer of given statement
In this case, 58.703 has five significant figures because the 3 at the end is significant and therefore makes the 0 significant as well. Since there are 5 significant figures, we need to round off the 7 to get 58.7, which has three significant figures.
Hope this helps.
For question 2 its A. For question 3 its A. (not all the way sure on 3 but i think its right) For question 1 if u remind me of what p and s is i can probably tell u the answer.
Answer:
polar covalent bonds
Explanation:
Phosphorus trichloride is a chemical compound of phosphorus and chlorine, having the chemical formula PCl 3. It has a trigonal pyramidal shape, owing to the lone pairs of electrons on the phosphorus atom.
Chlorine is more elctronegative than phosphorus . Phosphorus has a lone pair of electrons and every chlorine atom has three pairs of electrons . The molecule is not symmetrical as the shared electron pairs are closer to the chlorine atoms than the phosphorus atoms , the chlorine atoms are shifted towards one side of the center of the molecule , thus a net dipole effect is created. This is the reason why the molecule is polar .
Answer:
Explanation:
94.91 nm = 1237.5 / 94.91 eV
= 13.038 eV
Energy of ground state = - 13.6 eV
Energy of higher state to which it jumped
= - 13.6 + 13.038
= - .562 eV
If n be the orbit to which it jumped
13.6 / n² = .562
n = 5 ( approx )
b )
1281 nm = 1237.5 / 1281
= .966 eV
Energy of second photon = 13.038 - .966
= 12.072 eV
Wavelength of second photon
= 1237.5 / 12.072
= 12.51 nm
b ) Energy of intermediate level
= - 0.562 - .966 eV
= - 1.528 eV
If it be n th level
13.6 / n² = 1.528
n = 3