EXERCISES Answer in Detail .1.with the help of an experiment, explain reversible and irreversible changes. 2.Discuss physical changes in water. 3.explain solution when does a become saturated? What happens when the temperature of a saturated is raised? 4.How will you show that solubility of a solute changes with change in temperature of solvent? exercises Answer Briefly .1.What are physical changes? Give examples. 2.What are chemical changes? Give examples.3. while sprinkling water on a constructed wall, a bag of cement got wet. Next day it was kept outside the sunlight Can the change in cement be reversed? Why? 4.Give to examples from daily life experiences where expansion and contraction of metal are utilized.5. Suppose it rained heavily in your area today. To go to school, you remove your shoes and hold in your hands and fold your dress. Are these changes reversible?6. Doctors apply a thick coat of plaster of Paris (POP) over the bandage on a fractured bone. POP becomes hard on drying and keeps the fractured bone immobilised. Is it a reversible change ?7.Classify the following as reversible or irreversible changes. (a) Sharpening of pencil (b) Evaporation of water (c) Curdling of milk d) Freezing of water (e) Rusting of iron (f)Blowing a balloon (g)Opening of a bud (h) Dropping and breaking of a plastic toy .
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