L Pretest: Unit 4 Question 4 of 22
The hydrogen emission spectrum is shown below. What is the energy of the
410 nm emission line? (The speed of light in a vacuum is 3.00 x 10 m/s, and
Planck's constant is 6.626 x 10-34 J·s.)
-00
760 m
H
410 434
480
06
A. 4.85 10-19

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

the answer is c. nacl

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answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;