Which of the following statements is not true regarding physical properties and changes?

a. physical changes include evaporating, boiling, and dissolving.
b. physical changes can change compounds into elements.
c. physical properties can be observed without any change in the substance's identity.
d. a series of physical changes, such as filtration and heating, can be used to separate substances with different physical properties.

Option (B) is the correct answer.

Explanation:

Physical properties and changes are defined as the property or changes that does not cause any change in the chemical composition of a substance.

For example, cutting a piece of sodium with knife is a physical change.

Whereas boiling point, density, melting point etc are all physical changes.

On the other hand, changes that bring change in chemical composition of a substance are known as chemical changes.

For example, reactivity, toxicity etc are all chemical changes.

Hence, we can conclude that the statement physical changes can change compounds into elements, is not true regarding physical properties and changes.

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let that person have a turn to speak : )