Which element is found in both potassium chlorate and zinc nitrate?

The common element is: Oxygen    

Explanation:

Potassium chlorate is an ionic molecule, having molecular formula KClO₃. It contains a potassium cation (K⁺) and a chlorate anion (ClO₃⁻). The chlorate anion is composed of a chlorine atom and three oxygen atoms.

Zinc nitrate is an ionic molecule, having molecular formula Zn(NO₃)₂. It contains a zinc cation (Zn²⁺) and a nitrate anion (NO₃⁻). The nitrate anion is composed of a nitrogen atom and three oxygen atoms.

Therefore, the common chemical element that can be found in both, potassium chlorate and zinc nitrate is oxygen.

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