Match the following to show changes. Identify each as a physical or chemical change. Column A Column B a)decomposition of i)a magnesium ribbon b)cutting a ii)old leaves c)blowing of iii)rubber band d)stretching of a iv)balloons e)souring of v)copper wire f)burning of vi)milk

a) The decomposition of old leaves is a chemical change because after rotting new substances are formed that have an entirely different compositions from that of the original substance. b) Cutting a copper wire is a physical change because the shape of the wire is changed here, the composition of the wire remains the same. c) The blowing of balloons is a physical change since the shape of the balloon changes and it is a reversible and temporary change. d) Stretching of a rubber band is a physical change when the stretching is removed the rubber band goes back to its original state. e) Souring of milk is a chemical change because when the milk is soured it becomes curd having an entirely different compositions from that of milk. f) Burning of a magnesium ribbon is a chemical change , after burning ash is formed which is a new substance. Ash is having entirely different composition from that of ribbon. This change is also permanent and irreversible. Column A Column B a)decomposition of ii)old leaves b)cutting a v)copper wire c)blowing of iv)balloons d)stretching of a iii)rubber band e)souring of vi)milk f)burning of i)a magnesium ribbon

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New Science Spark Book 7>Chapter 7 - Changes of Matter>Put on your THINKING CAP!>Q 1

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The necessary condition for rusting is

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Important Questions on Changes of Matter

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New Science Spark Book 7>Chapter 7 - Changes of Matter>Put on your THINKING CAP!>Q 1

Which of these is not a method for preventing rusting in metals?

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New Science Spark Book 7>Chapter 7 - Changes of Matter>Put on your THINKING CAP!>Q 1

Combustion takes place in the presence of

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New Science Spark Book 7>Chapter 7 - Changes of Matter>Put on your THINKING CAP!>Q 1

The activity which shows both physical and chemical changes is

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New Science Spark Book 7>Chapter 7 - Changes of Matter>Put on your THINKING CAP!>Q 1

The iron compound that forms due to the reaction of iron with water and oxygen is known as

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New Science Spark Book 7>Chapter 7 - Changes of Matter>Put on your THINKING CAP!>Q 1

_____ is an alloy of iron and carbon.

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7th CBSE

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New Science Spark Book 7>Chapter 7 - Changes of Matter>Put on your THINKING CAP!>Q 2

Match the following to show changes. Identify each as a physical or chemical change.

Column A	Column B
a)decomposition of	i)a magnesium ribbon
b)cutting a	ii)old leaves
c)blowing of	iii)rubber band
d)stretching of a	iv)balloons
e)souring of	v)copper wire
f)burning of	vi)milk