Question

Срочно! Даю 50 балов Класифікуйте явища на фізичні і хімічні: горіння свічки, виготовення різних виробів з поліетинелу, почорніння мідної пластинки під час нагрівання, утворення неприємного запаху внаслідок протухання яєць, випаровування розчину кухонної солі, горінння магнію, поява крапель води на вікнах, скисання молока, розділення порошків суміші заліза й сірки магнітом, поява роси вранці

Answer 1

Физ- випаровування з розчину кухоннои соли, поява крапель води на викнах, роздылення порошкыв сумиши зализа й сирки, поява роси вранци, все остальные это фимия

Answer 2

Classification of Phenomena into Physical and Chemical:

1. Burning of a candle - This is a chemical phenomenon as it involves the combustion of the wax in the candle, which is a chemical reaction. The wax reacts with oxygen in the air to produce carbon dioxide, water vapor, and heat. [[1]]

2. Manufacturing various products from polyethylene - This is a physical phenomenon as it involves the transformation of the polyethylene material through processes like melting, molding, and shaping. These processes do not involve any chemical reactions. [[2]]

3. Blackening of a copper plate during heating - This is a chemical phenomenon as it involves the formation of copper oxide on the surface of the copper plate. When heated, copper reacts with oxygen in the air to form copper oxide, which appears as a black layer on the surface. [[3]]

4. Unpleasant odor due to the spoiling of eggs - This is a chemical phenomenon as it involves the decomposition of proteins in the eggs by bacteria. The breakdown of proteins produces various compounds, including sulfur compounds, which are responsible for the unpleasant smell. [[4]]

5. Evaporation of a solution of table salt - This is a physical phenomenon as it involves the conversion of a liquid (the solution) into a gas (water vapor) through the process of evaporation. No chemical reactions occur during this process. [[5]]

6. Burning of magnesium - This is a chemical phenomenon as it involves the combustion of magnesium metal in the presence of oxygen. The reaction produces magnesium oxide and releases a bright white light and heat. [[6]]

7. Formation of water droplets on windows - This is a physical phenomenon known as condensation. When warm, moist air comes into contact with a cold surface (such as a window), the water vapor in the air condenses into liquid water droplets. No chemical reactions occur during this process. [[7]]

8. Souring of milk - This is a chemical phenomenon as it involves the fermentation of lactose (milk sugar) by bacteria. The bacteria convert lactose into lactic acid, which causes the milk to sour and develop a tangy taste. [[8]]

9. Separation of iron and sulfur powders using a magnet - This is a physical phenomenon as it involves the separation of two substances based on their magnetic properties. Iron is attracted to magnets, while sulfur is not. By using a magnet, the iron powder can be separated from the sulfur powder. No chemical reactions occur during this process. [[9]]

10. Formation of dew in the morning - This is a physical phenomenon known as condensation. When the temperature of the air drops during the night, the water vapor in the air condenses into liquid water droplets, which appear as dew on surfaces like grass, leaves, and windows. No chemical reactions occur during this process. [[10]]

I hope this classification helps! Let me know if you have any further questions.