Q158CP - Chemistry: Molecular Nature Of Matter And Change

Question

Which of the following steps in an overall process involve(s) a physical change and which involve(s) a chemical change?

               

Step-by-Step Solution

Answer

In the diagram,

1. Chemical change
2. Physical change
3. Chemical change
4. Chemical change
5. Physical change

Step 1: Explanation of first three reactions

1. The new compound formation consists of both red and blue atoms. It is a chemical reaction.
2. The molecules can divide which consists of blue atoms and those that consist of both red and blue atoms. It is a physical change.
3. The atoms can be formed from molecules and it is possible when there is a chemical change.

Step 2: Explanation of next two reactions

      4.The formation of new molecules consists of one red and 2 blue atoms. It is a chemical change.

      5.There are only changes in the matter state. It is a physical change.