Problem

What is the density of water and ice?

Materials:

5 ml. Pipette, clamp, centimeter ruler, triple-beam balance, beaker, ice tray

Can you identify each of the materials?

Procedure

Put the pipette into the freezer overnight.

Copy Table I (shown in the Results Section below) into your lab notebook. Or print the table from here

Begin to collect your data. Click on the images for a sharper look and take your measurements.

Find the volume of the ice in pipette. Find the mass of the ice and pipette.

Record your results in Table I.

Melt the ice, by holding the pipette in the palm of your hand. The heat from your hand will slowly melt the ice.Observe what has happened after two minutes. All the ice has turned to water. Notice how the level has changed.

Click on the images and

Find the volume of the water in pipette. Find the weight of the water and pipette.

Record your results in Table I.

Empty the water from the pippette Find the mass of the empty pipette

Complete Table I.

Results

Using Table I answer the following questions.

• What happened to the mass of the ice after it turned to water? Why?
• What happened to the volume of the ice after it turned to water?
• Where did the heat come from that changed the ice back to water?
• How does your value for the density of ice and density of water compare to your estimated value? (click "back" and take a look).
• What value did you get for the density of water? For the density of ice?
• How do your results compare with those in the scientific literature Click here to compare.

  Conclusions

  Discuss each of the questions presented in the introductory lesson.

  Why were plastic pipettes used instead of glass?

  Your values in Table I may not be exactly the same as those of other students who performed the experiment in a classroom laboratory. Give reasons to explain these differences?

  What physical properties changed when ice turned to water? Why? How do these answers compare with the answers you gave in the introductory lesson ?

  Why do you think there is a difference in density between water and ice? After all, both are made of the same substance.If you are interested in knowing more then....

  

  click here and go to Part II !!