The element potassium (a metal) has a melting point of 63.65^∘ C and a boiling point of 774^∘ C.

step 1 So a melting point is the temperature at which the substance undergoes a phase transition from a

The element potassium (a metal) has a melting point of...

The element potassium (a metal) has a melting point of $63.65^{\circ} \mathrm{C}$ and a boiling point of $774^{\circ} \mathrm{C}$. Suppose a sample of potassium at $100^{\circ} \mathrm{C}$ is cooled to room temperature $\left(25^{\circ} \mathrm{C}\right) .$ In what state of matter is the potassium at $100^{\circ} \mathrm{C}$ ? In what state of matter is the potassium at $25^{\circ} \mathrm{C} ?$ What term is used to describe the phase change, if any, that occurs as potassium is cooled from $100^{\circ} \mathrm{C}$ to $25^{\circ} \mathrm{C} ?$

Labs

Want to see this concept in action?

NEW

Explore this concept interactively to see how it behaves as you change inputs.

View Labs

Key Concepts

States of Matter

This is the classification of matter into distinct forms such as solids, liquids, and gases based on their structural and dynamic properties. Understanding these states helps explain how materials behave under different temperature and pressure conditions.

Melting Point

This is the specific temperature at which a substance transitions from a solid state to a liquid state. It is a critical physical property used to predict phase behavior when a substance is heated or cooled.

Boiling Point

This is the temperature at which a substance changes from a liquid to a gaseous state. While it is essential for determining vaporization conditions, in scenarios where temperatures are below the boiling point, it confirms that the substance remains in liquid or solid form.

Phase Transition (Freezing)

This refers to the process by which a substance changes from a liquid to a solid state when its temperature is lowered below the melting point. This phase transition, known as freezing, involves the removal of latent heat as the substance solidifies.

Transcript

Please give Ace some feedback