Chemistry Practice Problems Physical & Chemical Changes Practice Problems Solution: Physical or Chemical?:A) Frost forms as the temper...

Solution: Physical or Chemical?:A) Frost forms as the temperature drops on a humid winter night.B) A cornstalk grows from a seed that is watered and fertilized.C) Dynamite explodes to form a mixture of gases.D) Perspiration evaporates when you relax after jogging.E) Perspiration evaporates when you relax after jogging.

Problem

Physical or Chemical?:

A) Frost forms as the temperature drops on a humid winter night.

B) A cornstalk grows from a seed that is watered and fertilized.

C) Dynamite explodes to form a mixture of gases.

D) Perspiration evaporates when you relax after jogging.

E) Perspiration evaporates when you relax after jogging.

Solution

We are asked whether the given are Physical or Chemical changes:

  • 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.


  • physical change is a type of change in which the form of matter is altered but one substance is not transformed into another. The size or shape of matter may be changed, but no chemical reaction occurs
  • Physical changes are usually reversible 


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