Question

ANSWER THE FOLLOWING QUESTIONS:


Question 1.

What kind of change is shown by tearing of paper?


Question 2.

Give example of a physical change which occurs by the action of heat.


Question 3.

How can you say that ripening of a fruit is a chemical change?


Question 4.

Is souring of milk a physical change or a chemical change? Why?


Question 5.

Name the process by which common salt is obtained from sea water.

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Answer 1

Answer:

Question 1 ) Physical change

Question 2) When ice is heated it changes its state from solid to liquid.

Question 3) Ripening of fruits is a chemical changes. During ripening the pigment present in the skin of the fruit changes and this can not be reversed back. it is a chemical change as once a fruit ripens it cannot turn raw again.

Question 4) That's a chemical change. because a chemical changes require a change on a molecular level that cannot be reversed because they form some new substance. Souring milk is not something you can reverse, and the process of it souring produces new molecules.

Question 5) Evaporation

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Answer 2

Answer:

1) physical change

2) boiling

3) fruit may change color when it ripens. contact with water, it begins to bubble. The formation of gas bubbles is another indicator that a chemical change may have occurred.

4) a chemical change . Explanation: the process involved is fermentation in which the lactose is converted to lactic acid.

5) evopration