physical and chemical change the change does not actually make any new substance, we say it is a...
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PHYSICAL AND
CHEMICAL CHANGE
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• The change does not actually make any new substance, we say it is a physical change.
• Most physical changes are quite easy to reverse. Some reactions are fast and some are slow.
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PHYSICAL CHANGENo new
substance made
Easily reversed
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Sharing of cake
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Drilling of iron
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Here are more examples :
Evaporation of water
Melting of ice
Dissolving of sugar in water
Powdering the sugar
Breaking of glass
Tearing of paper
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Chemical ChangesChemical Changes
Changes that cause to produce a Changes that cause to produce a new substance are called as new substance are called as Chemical Chemical ChangesChanges which are which are relatedrelated with with innerinner propertiesproperties of substances, such as : of substances, such as :
Breaking the bonds between atoms in Breaking the bonds between atoms in molecules molecules
Forming new bonds between atomsForming new bonds between atoms
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Generally we can say that chemical changes are notnot reversablereversable but someones are reversible.
For example :
C + O2 CO2
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CHEMICAL CHANGENew substance(s)
made
Not easily reversed
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Baking of cake
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Rusting of iron
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Here are more examples :
Burning of candle
Changing of CO to CO2
Freezing of cement
Spoiling of fruit
Rusting of iron
Cooking of egg
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Chemical changes (reactions) are shown with symbols and formulas is called chemical equation. By this way chemical reactions can be shown easily.
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For example:2Na(s) + 2H2O(l) →
2NaOH(aq) + ↑H2(g) + Q(heat)
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Multiple Choice Question 1Multiple Choice Question 1
Which is true for physical change?
• No new substances are produced
• Frying of potato is a physical change
• Cooking of egg is a physical change
• New substances are produced
• They are not easily reversed
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Multiple Choice Question 2Multiple Choice Question 2
Which is true for chemical change?
• No new substances are produced
• Drilling of iron is a chemical change
• Rusting of iron is a chemical change
• Dividing of an apple is a chemical change
• Easily reversed
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Multiple Choice Question 3Multiple Choice Question 3
Which one of the following is chemical change?
• Dividing of apple
• Frying of aubergine
• Cutting of wood
• Peeling of apple