2zn + 3 fecl2 →3 fe + 2 zncl3 how many chlorine atoms are used in the equation above?

The number of chlorine atoms used is found by finding the compound(s) where chlorine is found in either the reactants. In this case, FeCl2 is the only compound with chlorine in the reactants so we will focus on it.

Then multiply the subscript of the chlorine (2 in this case) with the coefficient of the compound (3 in this case). 2*3 = 6

So there are 6 chlorine atoms used.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

tracks, burrows, eggshells, nests, tooth marks, or gastroliths