i. The substance that helps water to remove dirt from the surface of material is called …… . ii. Fluoride is used in toothpaste to prevent ……… .

Question

Fill appropriate terms in the blanks:

(white cement, soap, detergent, wearing of bones, tooth decay, hard, soft, portiand, fatty acid)

i. The substance that helps water to remove dirt from the surface of material is called ……… .

ii. Fluoride is used in toothpaste to prevent …………… .

iii. Soap is a salt of …………… and sodium hydroxide.

iv. Synthetic detergents can be used in …………… water as well.

v. For construction purposes …………… Cement is the most commonly used cement.

Answer 1

i. soap

ii. tooth decay

iii. fatty acid

iv. hard

v. white cement