Identifica los elementos y la cantidad de átomos de cada uno qué hay en la fórmula de los siguientes compuestos C2H5OH(etanol)
ZnCl2(clouro de zinc)
HCl(ácido clorhidrico)
CH4(metano)
CO2(dióxido de carbono)

Which of the following elements is a representative element? a. chromium (cr) b. aluminum (al) c. mercury (hg) d. silver (ag)

Which sentence best describes the formation of igneous rock? a- lava on the surface dries up and makes arock b_melted rocks cools and forms crystals c_rocks under tremendous heat and pressure d_magma is melted rock underground

The excretory system,need answers for all: )