Question

Будет ли плавиться свинец, если его бросить в расплавленное олово? Ответ обоснуйте. Можно ли в алюминиевом сосуде расплавить цинк? Ответ обоснуйте. Почему для измерения температуры наружного воздуха в холодных районах применяют термометры со спиртом, а не с ртутью?

Answer 1

Ответ:

1.Не будет, так как температура плавления свинца больше. 2.Возможно , так как температура плавления цинка меньше чем у алюминия.

В холодных районах применяют спиртовые термометры, потому что спирт обладает более низкой температурой замерзания, нежели ртуть

Answer 2

Will lead melt if it is thrown into molten tin? Explain your answer.

When lead is thrown into molten tin, it will not melt. This is because lead has a lower melting point than tin. The melting point of lead is approximately 327.5 degrees Celsius, while the melting point of tin is around 231.9 degrees Celsius [[1]].

Since the temperature of the molten tin is below the melting point of lead, the lead will not reach its melting point and will remain solid. It will not mix or dissolve into the molten tin.

Can zinc be melted in an aluminum container? Explain your answer.

Yes, zinc can be melted in an aluminum container. The melting point of zinc is approximately 419.5 degrees Celsius, while the melting point of aluminum is around 660 degrees Celsius [[2]].

Since the melting point of aluminum is higher than that of zinc, it is possible to melt zinc in an aluminum container without melting the container itself. However, it is important to note that the container should be able to withstand the temperature required to melt zinc.

Why are alcohol thermometers used to measure the temperature of the outside air in cold regions instead of mercury thermometers?

Alcohol thermometers are often used to measure the temperature of the outside air in cold regions instead of mercury thermometers for several reasons:

1. Alcohol has a lower freezing point than mercury: Alcohol-based thermometers use a liquid called ethanol or isopropyl alcohol, which has a freezing point below -100 degrees Celsius. This allows the thermometer to accurately measure temperatures even in extremely cold conditions [[3]].

2. Safety concerns: Mercury is a toxic substance, and exposure to it can be harmful to human health and the environment. In cold regions, there is a risk of mercury thermometers breaking due to freezing temperatures, which could lead to mercury contamination. Alcohol thermometers, on the other hand, do not pose the same level of risk.

3. Alcohol has a wider temperature range: Alcohol thermometers can measure a wider range of temperatures compared to mercury thermometers. They can accurately measure temperatures from -115 degrees Celsius to +78 degrees Celsius, making them suitable for use in both extremely cold and hot environments [[4]].

4. Alcohol thermometers are less prone to damage: Alcohol thermometers are generally more resistant to damage from temperature changes and vibrations compared to mercury thermometers. This makes them more suitable for use in harsh outdoor conditions.

Overall, alcohol thermometers are preferred for measuring the temperature of the outside air in cold regions due to their lower freezing point, safety considerations, wider temperature range, and durability.