Q35. Why is melting of ice a physical change?

 

Q36. What happens when carbon dioxide is passed through lime water?

 

Q37. Why rusting of iron objects are faster in coastal areas than in deserts?

 

Q38. Why stretching of rubber band is a physical change?

 

Q39. Ozone acts as a natural shield against ultraviolet radiation. Explain

 

Q40. What happens when magnesium ribbon is burnt in air?

 

Q41. What is rusting?

 

Q42. When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.

 

Q43. Why are chemical changes important in our daily lives?

 

Q44. In addition to new products, what else may accompany a chemical change?

 


Last modified: Sunday, 6 January 2019, 4:50 PM