Which actions are evidence that a chemical reaction has occurred? check all that apply.
a: a change in color
b: the formation of a precipitate
c: a clear liquid becoming cloudy
d: a change in shape
e: the formation of bubbles
f: the formation of smoke

explanation:

a chemical change is a change in which atoms of one or more compounds rearrange themselves in order to form new compounds.

for example, formation of curd from milk is a chemical change.

a chemical change include following changes.

a change in color. the formation of a precipitate. the formation of bubbles.

Answer; a change in color the formation of a precipitate the formation of bubbles explanation; chemical reaction involves the rearrangement of atoms and bonds of the reactants, thus resulting to the formation of new substances, the products.

there are several aspects that shows the occurrence of a chemical reaction, these includes;

change in color change in odor production or formation of a gas or effervescence change in temperature or energy change formation of a precipitate.