How is a physical change different from a chemical change?

A.)In a physical change, bonds break and new bonds form, forming new substances.

B.)In a physical change, the properties of the substances change entirely.

C.)A chemical change cannot be reversed, but a physical change can.

D.)A chemical change creates new kinds of atoms and molecules than were present before the change.

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.