01 13-2012-warm up lab

Conclusion – Adhesion/Cohesion Lab: Page 99
Copy these definitions and answer the three conclusion questions.
Adhesion: the attraction of water molecules to other substances
Cohesion: the attraction of water molecules to other water molecules
If the number of drops is very different from your hypothesis, explain what accounts for the difference.
Explain your results in terms of cohesion.
Oxygen gas can only move into cells through wet surfaces. Explain why it is important that water is adhesive.

Surface Tension Lab – Page 100
Question: How many paperclips can you add to a full cup of water?
Hypothesis:
Materials:
Paperclips
Cup of water
Procedures:
Fill your small cup completely with water.
Slowly slide paperclips down the side of the cup counting the number of paperclips added.
Examine the cup from the side after adding 10 paperclips, 20 paperclips, and just before it overflows.

Data
How did the top of the cup look
After 10 paperclips:
After 20 paperclips
Just before it overflows
Group # of Paperclips Average

Conclusions – page 101
Surface Tension: the tendency of a liquid to reduce its surface
If the number of paperclips was very different from your prediction, explain what accounts for the difference?
Explain your results in terms of surface tension.
How do insects walk on water?

01 13-2012-warm up lab

by Janelle Wilson on Jan 13, 2012

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01 13-2012-warm up lab — Presentation Transcript