The ingredient of the toothpaste responsible for cleaning the teeth is _____.

calcium carbonate

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flouride

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silicon dioxide

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lead

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Write answer to the following questions.

(a) How does the use of a detergent help to clean soiled clothes ?

(b) How will you check with the help of soap powder whether water is hard ?

(c) What are the important ingredients of a toothpaste , and what is the function of each ?

(d) What are the ingredients of cements ?

(e) What will happen if cement is not used in making concrete ?

(f) Make a list of detergents that you use.

(g) What should be expected from a detergent for delicate garments ?

(h) What is meant by ' surface activity'? Name three chemicals responsible for the surface activity of various detergents.

Q. When a toothpaste tube is squeezed, its shape changes. The force responsible for this is an example of :

(a) balanced forces
(b) centripetal forces
(c) unbalanced forces
(d) centrifugal forces

Q. Which of the following ingredients in toothpaste are used to clean the teeth?

Q. Toothpaste for cleaning the teeth can neutralize the excess acid and prevent _______.

What is the main constituent of a toothpaste? How does it check decay of teeth?

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