Rank It Up!
Will different temperatures affect surface tension?
Problem
Hypothesis
Materials
-Scissors
-Metric Ruler
-Transperencies
-A marker
-1 box of toothpicks
-Tape
-Large sink
-Water
-Thermometer
-Eye dropper
-Laundry detergent
-Lab notebook
-Pencil
Procedure
2.Draw a shape for the raft on the transparency. The raft should be symmetric.(7-30 cm and about half that for the width.)
3. Cut out a space on the back of the raft where the sponge will be(about 3 by 4 cm).
4.Cut out the raft.
5.run the toothpick through one of the sponge pieces.
6.Attach the 2 toothpick sides to the raft.
7.Fill the large sink with water at room temperature.
8.Put the raft onto the the water surface and let it float.
9.Put a drop of laundry detergent to the sponge.
10.observe and record motion.
11.Repeat the process for hot water and for cold water.
12. Clean up materials.
Results:In room temperature water
Results:In hot water
Results: In cold water
Conclusion
Before Experiment Research
Research: The surface tension of a liquid results from an imbalance of intermolecular
Attractive forces, which is the cohesive forces between the molecules.
Cohesive forces: Intermolecular forces which cause a tendency in liquids to resist seperation
The surface tension of a solid can't be measured like a liquid's surface tension can be.
Forces of the attraction between liquid and solid tensions are called adhesive forces. The difference in strength between cohesive forces and adhesive forces show the behavior between a liquid with a solid.
After Experiment Research
Do different liquids have different surface tension: Yes they do because they have different amounts of intermolecular forces.
In water there are two types of molecules: the interior molecule and the exterior molecule. The interior molecule is attracted to the molecules all around it. The exterior molecule is attracted to the surface molecules and the ones underneath. The water molecules attract each other due to the water's polar property. The positive ends of hydrogen and the negative ends of oxygen cause if to stick together. This is how surface tension came to be.
Variables
Dependent Variable- The force of the surface tension on the raft
Controlled Variables-The type of liquid(water), the area of the sink, the amount of water, the same raft.
Research links
https://prezi.com/m/ww7eejkvdmir/the-effect-of-different-liquids-on-surface-tension/
Purdue University-Surface Tension( chem.purdue.edu )
online library.wiley.com> doi>pdf
National Wildlife Federation(nwf.org)