Question 1 What is meant by rusting of iron? State two conditions necessary for rusting of iron? How rusting damages iron objects? Question 2 What happens when an iron nail is kept immersed in copper sulphate solution? Question 3 What happens when baking soda is added to vinegar? Give its chemical reaction? Question 4 What happens when carbon dioxide is passed through … [Read more...] about Chemical Changes
Physical and Chemical Changes
Physical Changes
Question 1 What is a physical change? Question 2 Give few examples of physical changes from everyday life? Question 3 Explain why melting of ice to form water is said to be physical change? Question 4 What are the characteristics of physical changes? Question 5 Explain why boiling of water is said to be physical change? All substances have certain properties such as … [Read more...] about Physical Changes