Question

A block of aluminum is (A) ground into aluminum powder and then (B) ignited. It then emits flames and smoke. Classify (A) and (B) as chemical or physical changes. a. (A) Chemical, (B) Chemical b. (A) Chemical, (B) Physical c. (A) Physical, (B) Chemical d. (A) Physical, (B) Physical

Answer 1

Grinding aluminum into powder is a physical change, while igniting the powder is a chemical change.

Step-by-step explanation:

The process of grinding a block of aluminum into aluminum powder is a physical change. This is because no new substances are formed during the grinding process; only the physical properties of the aluminum are altered. However, when the aluminum powder is ignited, it undergoes a chemical change. The ignition of aluminum powder results in the formation of new substances, such as flames and smoke, indicating a chemical reaction.

Learn more about Physical and Chemical Changes