CHEMISTRY SCIENCE (CLASS 6)

Dear students I hope you have gone through the tentative SECOND CARD syllabus.Here are more questions to revise. 

1   a. State the difference between reversible and irreversible changes.
     b. State the difference between periodic and non periodic changes.
     c. What are physical and chemical changes? Give an example.
     d. Iron expands on heating. Is this physical or chemical change? Explain your answer.
     e. Define the following: i.Endothermic reaction    ii. Exothermic reaction