Question

question 3 of 20 :
select the best answer for the question.

1. which of the following is a physical property of a substance?

a. reactivity
b. hardness
c. toxicity
d. flammability

Explanation:

Physical properties are characteristics that can be observed or measured without changing the substance's chemical identity. Reactivity (A), toxicity (C), and flammability (D) involve chemical changes (reactions) to observe, so they are chemical properties. Hardness (B) can be measured (e.g., Mohs scale) without altering the substance's chemical makeup, so it's a physical property.

Answer:

B. Hardness