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Answer 1

Answer:

Ans1- Plaster of Paris is a popular material that is widely used in sculpting materials and gauze bandages. Gypsum plaster is another name for plaster of Paris. (CaSO4) H2O is the chemical formulas for plaster of Paris.

Ans2-the commercially valueless material in which ore is found.

"good ore

Ans3- The hydrochloric acid in the gastric juice breaks down the food and the digestive enzymes split up the proteins. The acidic gastric juice also kills bacteria. ... Together with the bicarbonate, this ensures that the stomach wall itself is not damaged by the hydrochloric acid.

Ans4- In physics, refraction is the change in direction of a wave passing from one medium to another or from a gradual change in the medium. Refraction of light is the most commonly observed phenomenon, but other waves such as sound waves and water waves also experience refraction.

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