B. Example Calculations
1) Witch is more polar? H-C or H-PH is 2.1 and P is 2.2 so the difference is .1. And for H-C H is 2.1 and C is 2.5 so the difference is .4 so H-C is more polar
2) Witch is more polar? O-F or O-I
O is 3.5 and F is 4.0 and the difference is .5. And for O-I, O is 3.5 and I is 2.7 so the difference is .8 so O-I is more polar
3) What are the electron configurations for Br and Br-?
Br-long form: 1s^(2), 2s^(2), 2p^(6), 3s^(2), 3p^(6), 4s^(2), 3d^(10), 4p^(5)
short form: [Ar] 4s^(2), 3d^(10), 4p^(5)
Br+: long form-1s^(2), 2s^(2), 2p^(6), 3s^(2), 3p^(6), 4s^(2), 3d^(10), 4p^(6)
short form: [Kr]
4) What is the electron configuration for Li and Li+?
Li-long form: 1s^(2) 2s^(1)
short form: [He] 2s^(1)
Li+:long form-1s^(2)
short form: [He]
5) If you have a cation Mg2+ how many Cl- do you need to balance out the charges of Mg2+?
You would only need 2 Cl- since Mg has 2 positive you need two negatives to balance it out. Mg^(2+)+2Cl- -> MgCl2
6) Find the Lewis Dot structure for HCl.
2) Witch is more polar? O-F or O-I
O is 3.5 and F is 4.0 and the difference is .5. And for O-I, O is 3.5 and I is 2.7 so the difference is .8 so O-I is more polar
3) What are the electron configurations for Br and Br-?
Br-long form: 1s^(2), 2s^(2), 2p^(6), 3s^(2), 3p^(6), 4s^(2), 3d^(10), 4p^(5)
short form: [Ar] 4s^(2), 3d^(10), 4p^(5)
Br+: long form-1s^(2), 2s^(2), 2p^(6), 3s^(2), 3p^(6), 4s^(2), 3d^(10), 4p^(6)
short form: [Kr]
4) What is the electron configuration for Li and Li+?
Li-long form: 1s^(2) 2s^(1)
short form: [He] 2s^(1)
Li+:long form-1s^(2)
short form: [He]
5) If you have a cation Mg2+ how many Cl- do you need to balance out the charges of Mg2+?
You would only need 2 Cl- since Mg has 2 positive you need two negatives to balance it out. Mg^(2+)+2Cl- -> MgCl2
6) Find the Lewis Dot structure for HCl.