## Reflection: Classroom Setup Defining Properties of Solids, Liquids and Gases - Section 1: NGSS Connections and Class Preparation

Here are some technicalities to be aware of when preparing the balloons and students pop them:

When filling the balloons with water that will be frozen, try to remove all the air before you tie the balloon. Otherwise the balloon has an air pocket, which causes the ice to break, and / or the balloon to peel away from the ice.

Keep the frozen balloon in an ice chest so that there is minimum melting. Students tended to describe the melting and not focus on solid ice observations.

When students pop the water balloon, water may squirt out with some force. Remind students to place the push pin on the underside of the balloon so that as much water a possible stays in the tray.

When discussing the properties of a gas, you may want to have a scale handy to show gas has weight, by comparing a balloon with air and one without air. Students did not think gas would have weight. You could also use this opportunity to discuss density which is why a helium balloon floats.

This lesson can be referred to when..

This lesson can also be used to introduce how matter can move from one phase to another by adding and removing heat.

Also, since this unit explores the properties of materials, this lesson could be used to start a word bank for material properties.

Scientists Beware
Classroom Setup: Scientists Beware

# Defining Properties of Solids, Liquids and Gases

Unit 5: Unit 5 Matter and Its Interactions
Lesson 1 of 11

## Big Idea: Students explore the 3 states of matter using balloons.

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95 minutes

### Renee Hoover

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