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POINTS TO REMEMBER, Airand water both are essential for life, The amount ofwater vapour present in air is called humidity, Air has weight, it occupies space andexerts pressure., Aar is colourless odourless and lasteless., Water is needed for drinking, cooking, washing, bathing, etc., Impurities are oftwo hpes-soluble and insoluble., *Soluble impurities can dissove in water., Insoluble impurities do not dissollve in water., Sohuble impurities can be removed by evaporation or distillation., Write Tfor True and F for Ealse ag, L Wecannot feel air but wecan see it, 2 Inhaled air is rich in oxygen, 3. Distilled water is used for making medicines, 4. Chalk is an insoluble impurity, 5. Airdoes not occupy space., 2., DMatch the following, is the purest form of water, 00 chiorination, LAir, 2. Filtrations, 3. Adding chlorine in water, (i) pressure, exercl se, ) moture of gases, Y) siter paper, 4. Water rises in a straw, 5. Rain water, Oral Questions, Subjective rype Questions, L Into howmany layers is the atmosphere divided?, 2 Inwhich layerof the atmosphere is the ozone layer found ?, E Answer the following questions:, 1. What is atmosphere? Name the component gases of air, 2 What are twotypes of impurities in water? Give example of each, 3. What are characteristics of air, 4. Write a short note on nitrogen and oxygen., 5. How can we prove that air occupies space and weight?, 6. What is distillation? Explain it with the help of a diagram., Objective Type Questions, A Tick ()the correct option:, L The blanket of air that covers the Earth is called:, (a) hydrosphere, 2 Which ofthese gases comprises78% of the atmosphere?, (b)atmosphere, (c) biosphere, LEARNwith, fun, (a) Nitrogen, 3. Which component of air helps in burning?, (a) Carbon dioxide O, 4. Discases like asthma, bronchitis, etc. are caused due to:, (b) Oxygen, (c) Argon, Activity: Identify these activities with the help of pictures:, (b) Smoke, (c) Oxygen, (a) polluted air, B. Fill in the blanks:, (b)polluted water, (c) lack of food, Bathing Drinking Washing watering, Cooking, 1 Airalsohas tueight and exerts pressure, 2 Afire can not be lighted ifthere is no OK4gen/aur, 3. The substance that dissolves in water, iscalled oluble substance, 4 Distilled, 5. Contamination of air cause Cir, Project: Unscramble the following jumbled words:, 1 INORTNEG, 2 EOZON YLARE OZONE LAYE, 4 SILIDTANILOT, 6 MUHIDYIT, DISITLLAT, 3. RESERSUP, PRESSURE, HUMEDITY, FELTERATION, FILTRATION, EVS-5 37, wateris widely used in injections and medicines filtrations., 5. LARTINFITO, pollution., EVS -5 36, WEEE