Paragraph 1 discusses some differences between pure substances and m

one of the following statements is true?!

A Pure substances can be separated by physical changes.

B Mixtures can be separated by physical changes.

C The chemical properties of a pure substance are variable

D The physical properties of a mixture never change

B Mixtures can be separated by physical changes.

Explanation:

Mixtures are impure substances with the following features:

Their composition is indefinite i. e they consist of two or more elements and or compounds in any proportion by mass. Constituents of mixtures often retain their identities. Their constituent often react differently to changed conditions. They can easily be separated into their constituents by using physical methods.

Examples of mixture are sea water, muddy water e. t. c