Solution: Select the best statement.A) Chemical changes provide the only valid basis for identification of a substance.B) Chemical changes are easily reversed by altering the temperature of the system.C) Chemical changes always produce substances different from the starting materials.D) Chemical changes are associated primarily with extensive properties.E) Chemical changes are accompanied by changes in the total mass of the substances involved.

Problem

Select the best statement.

A) Chemical changes provide the only valid basis for identification of a substance.

B) Chemical changes are easily reversed by altering the temperature of the system.

C) Chemical changes always produce substances different from the starting materials.

D) Chemical changes are associated primarily with extensive properties.

E) Chemical changes are accompanied by changes in the total mass of the substances involved.

Solution

We are asked to select the best statement from multiple choices about chemical change.


  • A chemical change is a kind of change in which a substance combines with another to form a new substance.
  • When chemical changes or reactions occur, the atoms are rearranged and the reaction is accompanied by an energy change as new products are generated.
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