GIVE REASONS FOR THE FOLLOWING STATEMENTS.
1) Burning of a candle is both physical and chemical change.
2) Graphite is used in the leads of pencils.
3) Lime water turns milky when carbon dioxide is passed.
4) Oxygen is collected by the downward displacement of water.
5) Gases can flow in any direction.
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Answers
Explanation:
1) Burning of candle is physical change because the candle changes its states. It transform from solid to liquid and then liquid to gaseous.
Burning of candle is chemical change because when we light up the candle through oxygen it convert into carbon dioxide and water.
So, burning of candle is both physical and chemical change.
2) Graphite is used in the leads of pencils because the carbon atoms makes the pencil smooth to write in paper.
3) Lime water contains calcium hydroxide Ca(OH)2. When calcium hydroxide reacts with carbon dioxide(CO2) it produces calcium carbonate(CaCO3) and water(H2O). The calcium carbonate makes the water milky.
4) Oxygen is collected by the downward displacement of water because it is only slightly soluble in water and is less dense than water.
5) The particles of any gas are widely spread and can move freely in any direction .
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