Working...
Student's in my Chemistry I class have been discussing how physical changes differ from chemical changes. Physical changes involve a change of one or more physical properties. Chemical changes involve changes in the composition of the substance. The following are clues that indicate that a chemical change may have occurred: a color change, the evolution of bubbles, the formation of a solid, and heat absorbed or produced. Chemistry I students recently carried out four lab procedures and made observations about each one. They then had to use the clues listed above to determine if a chemical reaction occurred.
