Positively Popcorn

Adapted from a Lesson Developed by Janie Scronce

Objectives:

Second Grade

Objective 3.01
Determine three states of matter:
- Solid.
- Liquid.
- Gas.

Objective 3.02
Observe changes in state due to heating and cooling in common materials.

Materials:

Lesson Plan:

Engagement:

Hold up a bag with several popcorn kernels. Ask students a series of questions such as what is this? How do you know? Have you ever eaten it?

Hold up a bag with several pieces of popped popcorn. Ask students the same series of questions again.

Ask students if they know how popcorn goes from being a kernel to a piece of popcorn. Have the students brainstorm ideas.

Read the story The Popcorn Dragon by Jane Thayer

Exploration:

 

Explanation:

Ask students questions about what they observed and learned from exploring the kernels and popped popcorn and watching the popcorn actually pop. Possible questions include:

Inside of each peice of popcorn is a tiny drop of water. When heat is added, the water changes from liquid into a gas (steam). When the pressure of the steam becomes to great, the popcorn kernel bursts open to form a piece of popcorn.

Expansion:

Set several popcorn kernels out in the sun for several days and then try to pop them.

Teacher note: Setting the kernels in the sun will cause them to dry out. With less water they will be difficult to pop.

Evaluation: