Which answer includes all of the following that are chemical changes, and no physical changes?
I. The cutting of an iron bar into smaller pieces.
II. The solidification of mercury by cooling.
III. The dropping of iron into hydrochloric acid, producing hydrogen gas.
IV. The mixing of water and drinking alcohol.
V. The fermentation of grape juice.

Question

Quizplus · Accepted Answer

III and V are chemical changes. III involves a chemical reaction between iron and hydrochloric acid, producing hydrogen gas. V involves the fermentation of grape juice, which is a biochemical process that converts sugars into alcohol and carbon dioxide. I is a physical change because it's just cutting, not changing the chemical composition. II is a physical change because it's a phase change from liquid to solid. IV is a physical change because mixing water and alcohol doesn't change their chemical structures.

Which Answer Includes All of the Following That Are Chemical