Question

Сопоставьте золото и уголь по их свойствам

Answer 1

Ответ:

Золото:

• Химический символ: Au
• Цвет: желтый
• Плотность: 19,32 г/см³
• Точка плавления: 1064 °C
• Не реагирует с кислородом и большинством кислот

Уголь:

• Химический символ: С
• Цвет: черный
• Плотность: 1,5-1,7 г/см³
• Точка плавления: не плавится, а разлагается при высоких температурах
• Реагирует с кислородом при высоких температурах, образуя углекислый газ.

Answer 2

Properties of Gold:

Gold is a precious metal known for its unique properties. Here are some key characteristics of gold:

1. Chemical Symbol and Atomic Number: Gold is represented by the chemical symbol "Au" and has an atomic number of 79.

2. Physical Appearance: Gold is a dense, soft, and malleable metal. It has a bright yellow color and a lustrous shine, which makes it highly valued for jewelry and decorative purposes.

3. Melting and Boiling Points: Gold has a relatively high melting point of 1,064 degrees Celsius (1,947 degrees Fahrenheit) and a boiling point of 2,808 degrees Celsius (5,086 degrees Fahrenheit).

4. Conductivity: Gold is an excellent conductor of electricity and heat. It is often used in electronic components, such as connectors and circuit boards, due to its high conductivity.

5. Corrosion Resistance: Gold is highly resistant to corrosion and tarnish. It does not react with oxygen or most acids, making it a durable and long-lasting material.

6. Density: Gold is a dense metal, with a density of approximately 19.3 grams per cubic centimeter. This high density contributes to its weight and value.

7. Rarity and Value: Gold is a rare metal, which adds to its value. It has been used as a form of currency and a store of value for centuries.

Properties of Coal:

Coal is a fossil fuel that is primarily composed of carbon. Here are some key properties of coal:

1. Formation: Coal is formed from the remains of plants that lived and died millions of years ago. Over time, the plant material was subjected to heat and pressure, resulting in the formation of coal deposits.

2. Carbon Content: Coal is primarily composed of carbon, along with small amounts of other elements such as hydrogen, sulfur, oxygen, and nitrogen. The carbon content in coal determines its energy content and quality.

3. Energy Content: Coal is a highly energy-dense fuel. The energy content of coal varies depending on its type and quality, but it is generally higher than other fossil fuels such as oil and natural gas.

4. Combustion: When coal is burned, it releases energy in the form of heat. This heat can be used for various purposes, including electricity generation, heating, and industrial processes.

5. Environmental Impact: The combustion of coal releases carbon dioxide (CO2), a greenhouse gas that contributes to climate change. Coal combustion also produces other pollutants, such as sulfur dioxide (SO2) and nitrogen oxides (NOx), which can have detrimental effects on air quality and human health.

6. Mining and Extraction: Coal is extracted from underground mines or surface mines through a process called mining. The mining of coal can have environmental impacts, including habitat destruction, water pollution, and soil erosion.

7. Uses: Coal has been used as a source of energy for centuries. It is primarily used for electricity generation, heating, and industrial processes. In some regions, coal is also used for cooking and as a raw material in the production of steel and other materials.

In summary, gold is a precious metal known for its lustrous appearance, conductivity, and resistance to corrosion, while coal is a fossil fuel primarily composed of carbon and used as a source of energy.