Predict what will happen when this flask of liquid is

heated.

Explain how temperature affects the molecules of a

liquid in a thermometer.

Glass tube

• Material Needed:– Student thermometer– Magnifier– Cold water – Hot water (about 50 °C)– *use measuring cup to get the hot water and

cold water when needed.

• Look at an animation of the molecules of liquid in a thermometer, as they are heated and cooled. Click on the picture of the thermometer to go onto the website.

Viscosity: a liquid’s resistance to flowing

Add to sentence box:

*high viscosity = flows slowly, low viscosity = flows quickly

• Click on the picture below.

• Test different liquids, using the same temperature for both liquids. (You can change the temp., just change both of them to the same thing.

Vocabulary!! (Add to your vocab. Paper)

Thermometer Conclusions1. Based on what you know about the way

molecules move in hot liquids, explain why the liquid in the thermometer goes up when heated.

When liquids are heated the molecules move faster & spread farther apart. The only place they have to spread out to is up the thermometer tube.

Thermometer Conclusions2. Based on what you know about the way molecules move in cold liquids, explain why the liquid in the thermometer goes down when cooled.

When liquids are cooled the molecules move slower & get closer together. As the molecules move closer they go back down the tube that they had expanded into.

Thermometer Conclusions3. Why do you think the tube that contains the liquid is so thin?

The tube is so thin so we can see the difference in the height of the liquid more easily & be more precise & accurate in the reading.