Question

A solid is placed in a solution. Which observation most likely indicates that a chemical reaction has occurred?

A) The size of the solid has rapidly decreased.
B) The color of the solution has not changed.
C) The solid has bubbles forming on its surface.
D) The temperature of the solution stays the same.

Answer 1

The answer is probably C

Answer 2

Answer;

C) The solid has bubbles forming on its surface.

Explanation;

-Chemical reactions involves the reaction of reactants that involves rearrangement of their structure resulting to the formation of new substances.

-There are a number of common indicators that are used to show that a chemical reaction has taken place, namely;

• Change of color
• Change of Odor
• Change in temperature or energy
• Formation of precipitate
• Effervescence or formation of gas bubbles.