1. En la fabricación de una bengala de luz azul, se utilizó el cloruro del metal con número de +2, la fórmula química del compuesto es A. CoCl2
B. CuCl2
C. CuCl
D. CoCl

Explanation is in the file

cutt.ly/zxt1ipy

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of c is as shown here in the image.

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.