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Engage/Elicit:

The three most common states of matter are solid, liquid and gas. What do you think water is like in each of these states?

Draw tool with table (see below)

L5 Use the drawing and text tools to illustrate and explain your answers. L4 Describe what you think water is like as a solid, liquid and gas. L3 Fill in the table with a drawing and description of water in each state of matter. State of matter Drawing of water Description Solid     Liquid     Gas     L2 You may choose one of the images and drag it to the right place. Stamps: ice, liquid water, invisible L1 Look at the example provided, then fill in your own table below. State of matter Drawing of water Description Solid Drawing: Ice The solid form of water is ice. Liquid Drawing: water Water can be a liquid. Gas Drawing: invisible Water vapor is a gas that is invisible.

Explore:

Zoom models: ice, liquid water and cloud

1. Imagine that you can zoom in on a block of ice. Use the dots at the top of this picture to zoom in on the ice. When you zoom all the way in, draw what you see.

1. Imagine that you can zoom in on a glass of water. Use the dots at the top of this picture to zoom in on the water. When you zoom all the way in, draw what you see.

1. Imagine that you can zoom in on water vapor, or water in its gaseous state. Use the dots at the top of this picture to zoom in on the water vapor. When you zoom all the way in, draw what you see.
2. Imagine that you can zoom in on a cloud. Use the dots at the top of this picture to zoom in on the cloud. When you zoom all the way in, draw what you see.

   Draw tool

Explain:

Water is made up of molecules, tiny particles that we can't see with the naked eye. In solids, like ice, the molecules are bound tightly to each other. In liquids, the molecules are bound more loosely to each other, and they can move and the liquid can change shape. In gases, like water vapor, the molecules are free and move through space. Clouds are made of water droplets. Water vapor from the air condenses into tiny droplets of liquid water. As more and more of the water vapor condenses, the droplets get bigger. When they get big enough, they precipitate as rain, or even snow.

Here's one way to picture it.

Look at the three boxes below from about arm's length away. What do you see in each box?

Now look at the three boxes up close. What do you see in each box?

Each box has 20 dots in it. When they are in large groups (Box A) it is like rain droplets, and you can see them. When they are in small groups (Box B) it is like clouds or fog. When they are spread out (Box C), it is like water vapor. The individual molecules are invisible because they are so small.

5-6 Molecular-level illustrations or models of each Ed: 5-6 would have an actual MW model. It shows two kinds of molecules – water and "air" – to show that water is one part of air, not just molecules in emply space by themselves or in some contiinuous fluid called air. When they clump up (droplets) they are still surrounded by air molecules. Posted by mateoaw at Aug 26, 2007 14:35