Question

13How do soaps work on dirt and stains?
14 What are the uses of plaster of Paris?
15.What is the principle behind the canning method used for preservation of food?
16.Name the components of talcum powder.​

Answer 1

Answer:

The soap molecule can therefore act like a double-agent: the salty end is attracted to water, while the fatty tail is attracted to the dirt or oil. ... When you wash your hands with soap, it dislodges the dirt, grease, oils, and disease-ridden fecal matter particles on your hands by creating these micelles.

Answer 2

13- The soap molecule can therefore act like a double-agent: the salty end is attracted to water, while the fatty tail is attracted to the dirt or oil. ... When you wash your hands with soap, it dislodges the dirt, grease, oils, and disease-ridden fecal matter particles on your hands by creating these micelles.

14. Plaster of Paris is used to make sculptures and metal castings used as decorative in buildings. It is also used in buildings to avoid fire hazards as Plaster of Paris is fire resistant. It is used as a coating on wood and metal structures to avoid any fire accidents.

15. Preserving using a canning method involves placing food in specified canning jars that are sealed with two-piece lids. The jars are heated to a temperature that destroys harmful microorganisms and inactivates enzymes. This heating, and later cooling, forms a vacuum seal.

16. Talc is a naturally occurring mineral, mined from the earth, composed of magnesium, silicon, oxygen, and hydrogen. Chemically, talc is a hydrous magnesium silicate with a chemical formula of Mg3Si4O10(OH)2.