Question

25. Differentiate between physical and chemical change. ​

Answer 1

Answer:

Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula.

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Answer 2

Answer:

5 major difference between physical and chemical change

physical change:

• A physical change is the change of matter that occurs without changing the chemical composition of matter.
• usually reversible .
• new products are not formed.
• some chenges occur when heating or cooling is done.
• changes have no effect on the chemical bond of molecules of a substance.

chemical change:

• A chemical change is the change of chemical composition of matter.
• usually irreversible .
• new products are formed.
• changes always involve absorption or release of energy.
• have a direct effect on the chemical bonds of molecules in a substance.