Water Molecules

Topics: Molecule, Water, Chemistry Pages: 4 (838 words) Published: August 20, 2013
BCR: Which Towel?
A student asks a testable question: “Which brand of paper towel absorbs the greatest volume of water?”
Design an investigation to provide an answer for the student. Be sure to include
• the materials needed.
• a numbered procedure.
• the independent and dependent variables.
• important data that will answer the question.
• ways to help ensure the accuracy of the results.
Materials: Several paper towels, a flat dish, bottled water, a thermometer, a tong, a ruler, and an scale,

Procedure:
(1) Weigh the sick + water
(2) Measure each sample of paper towel to be tested to assure a common size and weight. (3) Measure the temperature of the water.
(4) Add the towel sample to the water for a period of time using a consistent method. (5) Remove the sample from the water with a tong and allow excess water to leave the sample. (6) Measure the weight of both the wet paper towel sample and the flat dish Independent and Dependent Variables:

The dependent variable is the water absorbing capacity of the paper samples, and the independent variable is the weight of water captured by each paper sample. Important Data: The weight of the water trapped by each paper sample. Ways to Ensure Accuracy: Each measurement should be checked for accuracy at least twice by one or more observers, and each paper towel brand should be tested 2-3 times, using new paper samples each trial.

BCR: The Balloon
A balloon is placed over an empty flask. The flask is heated on a hot plate and then cooled in a container of ice water. The effect on the balloon is shown in the diagram below:

[pic]
Explain this observation based on the Kinetic Molecular Theory. In your response, be sure to
• describe the effect of temperature on the kinetic energy of the gas particles. • describe the motion of the gas particles.
• describe the effects of this change on the pressure and volume of the gas sample. When temperature increases, the...
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Water Essay
  • Essay on Importance of Water
  • The Biological Importance of Water Research Paper
  • The Biochemical Importance of Water Essay
  • Molecules of Life Essay
  • Water Molecule Essay
  • Modeling Molecules Essay
  • The Polarity of Water Essay

Become a StudyMode Member

Sign Up - It's Free
Capítulo Anterior | Philip Keung | Guess Who’s season 12 episode 05