Question

please answer this question class 6 science questions ​

Answer 1

Answer:

[a] milk - Copper forms many different complex's having a variety of colors, from red to green, from blue to black, and probably more. The formation of cupric oxide would account for the appearance of an insoluble black precipitate. This could happen from the decomposition of some of the cupric oxide. It is possible that the original cupric oxide appeared more blue than green, due to the blue cupric oxide solution. As the reaction proceeded, more and more of the cupric oxide precipitated to give that black-green precipitate, you observed.

mashed potato - If color of the contents turns violet, the food item contains protein. Food + water + copper sulphate + caustic soda —> violet color —> protein is present.

[b] milk - A paper published in the journal Food Chemistry has analyzed the levels of iodine in supermarket milk, reporting lower levels in milk labelled as organic compared with conventional milk. The authors suggest that this may increase the risk of iodine deficiencies in at-risk groups such as pregnant women.

mashed potatoes - Many different food groups contain a carbohydrate known as starch. Using an iodine solution, you can test for the presence of starch. When starch is present, the iodine changes from brown to blue-black or purple.

[c] There are six major nutrients: Carbohydrates (CHO), Lipids (fats), Proteins, Vitamins, Minerals, Water.

[d] The two main forms of carbohydrates are sugars (such as fructose, glucose, and lactose) and starches, which are found in foods such as starchy vegetables, grains, rice, breads, and cereals.