SUBJECT - CHEMISTRY
WORK SHEET 2
PHYSICAL AND CHEMICAL CHANGES
A. What do you observe when :
1. Water is boiled.
2. A piece of paper is burnt.
3. Iron rod is exposed to moisture and oxygen for few days.
4. Iron is heated with sulphur.
5. Ammonium chloride is added to water taken in the beaker.
6. Iodine is heated in a china dish covered with an inverted funnel.
7. Quick lime dissolves in water,
8. Solid ammonium chloride is heated.
Answers
Answer:
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Explanation:
Answer. On boiling water changes into steam (gas) physical change. On burning piece of paper produces carbon dioxide and ash is left behind. Is a chemical change.
Combustion. ... For example, when paper is burned oxygen from the air combines with carbon and hydrogen in the paper turning some of it into carbon dioxide and water vapor, which waft away with carbon particulates in the smoke. This, not surprisingly, leaves the solid ash leftover lighter than the original pape
Formation of Rust When the Iron is Exposed To Moist Air is Called - Fill in the Blank. ... Rust is iron oxide. Corrosion occurs in the presence of moisture. For example, when an iron is exposed to moist air, it reacts with oxygen to form rust(Fe2O3 .
When iron filings and sulphur powder are mixed and heated they undergo a chemical reaction and form ferrous sulphide (FeS). It is a new substance which has properties entirely different from Fe and S. Therefore, heating of mixture of iron and sulphur powder is a chemical change.
When Calcium oxide i.e. quick lime is added to water filled in a bucket, it reacts vigorously with water to produce slaked lime (calcium hydroxide) releasing a large amount of heat.