Created ByAmy Taylor

Hazelwood Central High School

To Teacher Page To Activity

Teacher Page• Grade Level: 10• MAP Content Standard:

– The learner will be able to use the particulate model to describe how atoms or molecules interacting during a change of state impact the properties of a substance

• Specifically, in this activity the students will predict the behavior of a gas when exposed to a change in temperature and the effect on volume.

• Tips– Preview this activity before using it in your

classroom.– Your students should already be familiar with

kinetic molecular theory and the behavior of gases prior to the presentation of this activity.

• Journaling– This activity was intended to be used in

conjunction with journaling.– The notebook icon will prompt the students

when to journal in their notebooks.

Focus on the process of problem solving with your

students…they need to understand not only the facts,

but the reasoning behind them. Have them write their thoughts on paper and then

discuss them as a class.

The Bottle and the Balloon

Kinetic Molecular Theory is based on three assumptions:1. All matter is composed of small particles (atoms, ions, molecules).2. These particles are in constant motion.3. All collisions between these particles are perfectly elastic (no change in total kinetic energy as a result of the collision).

In this activity you will need to use your knowledge of

Kinetic Molecular Theory and the behavior of gases to

hypothesize the outcome of a scenario.

Observe the following demonstration...• A small amount of water is heated in a

flask with a bunsen burner..• After the water has boiled

vigorously, it is removed from the heat and a balloon is immediately stretched over the mouth of the flask.

Hypothesize about what will happen to the balloon.

Explain why this occurred on a molecular level.

• The increase in heat from the bunsen burner changes the LIQUID water into water VAPOR which pushes the air out of the flask.

• When the balloon is placed over the lip of the flask, the air cannot re-enter.

• The balloon is filled with water vapor particles escaping from a liquid state to the gaseous state and exerting pressure on the balloon.

Before After

What do you think will happen as that same flask cools back to room temperature?

Discuss your hypothesis and

the actual result as a class.