Introduction: surface tension refers to water’s capability to “stick to itself”, as result of the pressures of cohesion. Surface ar tension deserve to be measured and observed by dropping water (drop by drop) onto a penny. The variety of water fall that deserve to fit ~ above a penny will surprise you.

You are watching: How is the surface tension of water affected by soap

Initial Observation:

Number of autumn ___________

2. Build a hypothesis that answers the speculative question stated above, “How is surface stress and anxiety of water impacted by soap?” write your theory below, using the appropriate “If…then…” format.

3. Test your hypothesis by compare the number of drops the tap water that deserve to fit top top a coin to the variety of drops the soapy water that deserve to fit on a penny. Due to the fact that water drops might vary depending on how well you drop the water, that is finest to run plenty of trials and take one average. Document your data in the table below

Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Average
Tap Water
Soapy Water

4. Analyze the data and organize your results in a graph.

5. Conclusion: write a paragraph listed below (using complete sentences) the explains how soap affect the surface anxiety of water, utilizing your data to assist you answer the question. Suggest a factor for your monitorings (Why did that happen?) Hint: check out in textbook around water’s cohesive properties. encompass a short description of your findings. Be certain to re-state the hypothesis in her conclusions and tell if the was sustained or not sustained by this test. Explain sources the error that might have influenced your results and also changes you might make in future experiments.


Post- rap Analysis:

Answer the adhering to questions in your lab notebook, after you perfect the conclusions.

5. Explain what surface anxiety is.

6. Why were countless trials taken and then the outcomes averaged?

7. In this experiment, what was her control group?

8. Identify the independent change in the experiment.

9. Identify the dependent change in the experiment.

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10. What if the experimental question was “How walk sugar influence the surface stress and anxiety of water?” describe how you would answer this inquiry using the scientific method.