Sodium chloride has a melting point of 1074 K and a boil-ing point of 1686 K. Convert these temperatures to degrees Celsius and to degrees Fahrenheit.

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Start by converting the melting point from Kelvin to Celsius using the formula: \( T_{\text{C}} = T_{\text{K}} - 273.15 \).

Apply the formula to the melting point: \( T_{\text{C, melting}} = 1074 - 273.15 \).

Next, convert the boiling point from Kelvin to Celsius using the same formula: \( T_{\text{C, boiling}} = 1686 - 273.15 \).

Convert the melting point from Celsius to Fahrenheit using the formula: \( T_{\text{F}} = \frac{9}{5}T_{\text{C}} + 32 \).

Apply the formula to the boiling point: \( T_{\text{F, boiling}} = \frac{9}{5}T_{\text{C, boiling}} + 32 \).

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주요 개념

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Temperature Conversion

Temperature can be expressed in different scales, primarily Celsius (°C), Fahrenheit (°F), and Kelvin (K). To convert from Kelvin to Celsius, subtract 273.15 from the Kelvin temperature. For Fahrenheit, the conversion from Celsius involves multiplying by 9/5 and then adding 32. Understanding these formulas is essential for accurately converting temperatures.

Melting and Boiling Points

The melting point is the temperature at which a solid becomes a liquid, while the boiling point is the temperature at which a liquid turns into vapor. For sodium chloride, these points indicate the temperatures at which it transitions between solid, liquid, and gas phases. Recognizing these points helps in understanding the physical properties of substances and their behavior under different temperature conditions.

Phase Changes

Phase changes refer to the transitions between solid, liquid, and gas states of matter, driven by temperature and pressure. During melting, a solid absorbs heat and changes to a liquid, while boiling involves a liquid absorbing heat to become a gas. These concepts are crucial for understanding the thermal properties of substances like sodium chloride and how they respond to temperature changes.