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Study Material for Class 7 Science Chapter 6 Physical and Chemical Changes
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Class 7 Science Chapter 6 Physical and Chemical Changes
Class 7 Science Physical and Chemical Changes Chapter Notes. There are many more useful educational material which the students can download in pdf format and use them for studies. Study material like concept maps, important and sure shot question banks, quick to learn flash cards, flow charts, mind maps, teacher notes, important formulas, past examinations question bank, important concepts taught by teachers. Students can download these useful educational material free and use them to get better marks in examinations. Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.
Physical and Chemical Changes
There are several differences between a physical and chemical change in matter or substances. A physical change in substance doesn’t change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.
For example, if a piece of paper is cut up into small pieces it still is paper. This would be a physical change in the shape and size of the paper. If the same piece of paper is burned, it is broken up into different substances that are not paper.
Physical change can be reversed, chemical changes cannot be reversed with the substance changed back without extraordinary means, if at all. For example, a cup of water can be frozen when cooled and then can be returned to a liquid form when heated.
If one decided to mix sugar into water to make sugar water, this would be a physical change as the water could be left out to evaporate and the sugar crystals would remain. However, if one made a recipe for a cake with flour, water, sugar and other ingredients and baked them together, it would take extraordinary means to separate the various ingredients out to their original form.
When heat is given off in a chemical change or reaction, it is called an exothermic reaction. When heat is absorbed in a chemical change or reaction, it is called an endothermic reaction. The speed at which chemical reactions take place depend on the temperature pressure and chemical reactions take place depend on the temperature pressure and how concentrated the substances involved in the chemical reaction are. Sometimes substances called catalysts are used to speed up or help along a chemical reaction. Light is helpful in the processing of film.
*Film is processed with the assistance of light.
* Heat is another factor that facilitates chemical reactions.
EXERCISE
I. Write true/false for the following statement.
1. With a physical change, no new substance is formed
2. With chemical change, no change in composition of substance occurs.
3. With a physical change, energy is either given of or absorbed.
4. A chemical change can be easily reversed
5. A catalyst speeds up a chemical reaction
II. Write the changes for the following
a) Glass Breaking
b) Rusting bicycle
c) Melting butter
d) Separating sand from grand
e) Spoiling food
f) Moving lawn
g) Corroding metal
h) Bleaching hair
i) Fireworks
j) Frying an egg
k) Burning leavings
l) Making salt water
m) Melting wax
n) Burning wax
o) Squeezing lemon
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CBSE Class 7 Science Chapter 6 Physical and Chemical Changes Study Material
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Chapter 6 Physical and Chemical Changes Study Material Science CBSE Class 7
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Chapter 6 Physical and Chemical Changes CBSE Class 7 Study Material Science
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CBSE Study Material Science Class 7 Chapter 6 Physical and Chemical Changes
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