Melting and Boiling Points

Melting and Boiling Points

Learning Objective

At the end of the lesson you will understand the concepts of melting and boiling points and their relation to the states of a substance. You will also be able to predict the state of a substance at any given temperature based on its melting and boiling points.

What do you already know about melting and boiling points?

Slide 1: Understanding the concepts of melting and boiling points

• Melting point: Temperature at which a substance changes from solid to liquid or from liquid to solid.
• Boiling point: Temperature at which a substance changes from liquid to gas or from gas to liquid.
• State of a substance: The form in which a substance exists, such as solid, liquid, or gas.

Slide 2: The relation between boiling point and state of a substance

• If the temperature is above the boiling point, the substance will be a gas.
• If the temperature is below the boiling point, the substance will be a liquid.
• Boiling point can be used to predict the state of a substance at any temperature.

Slide 3: The relation between melting point and state of a substance

• If the temperature is above the melting point, the substance will be a liquid.
• If the temperature is below the melting point, the substance will be a solid.
• Melting point can be used to predict the state of a substance at any temperature.

Slide 4: Predicting states of matter based on melting and boiling points

• If the temperature is above the boiling point and below the melting point, the substance will be a gas.
• If the temperature is below the melting point, the substance will be a solid.
• If the temperature is above the melting point, the substance will be a liquid.

Slide 5: Melting and Boiling Points

• Boiling Point: The temperature at which a substance changes from liquid to gas or from gas to liquid.
• Melting Point: The temperature at which a substance changes from solid to liquid or from liquid to solid.
• State of a substance: The form in which a substance exists, such as solid, liquid, or gas.

Write down 3 things you learned in this lesson.

Have students enter three things they learned in this lesson. With this they can indicate their own learning efficiency of this lesson.

Write down 2 things you want to know more about.

Here, students enter two things they would like to know more about. This not only increases involvement, but also gives them more ownership.

Ask 1 question about something you haven't quite understood yet.

The students indicate here (in question form) with which part of the material they still have difficulty. For the teacher, this not only provides insight into the extent to which the students understand/master the material, but also a good starting point for the next lesson.