Each group will have two pipettes, two small beakers, two small plastic cups, two capillary tubes, a sheet of wax paper, and a paper towel.Īt this point the instructor can lead the activity using the instruction sheet, or can give copies of the instruction sheet for the students to follow on their own.Students should be in pairs (or groups of four if materials need to be shared).Use the food coloring to color the water so that they can be easily seen during the activity. Fill one of the 1000mL beakers with water.**Students will write down their observations during the activity, so they will either need a notebook or paper. Small plastic cups (such as dosage cups that come with OTC medicines).Graduated cylinders (maybe do this as a demo for the class to illustrate meniscus?)įor the following items it would be ideal to have one per student, but items can be shared:.Higher order thinking skills goals for this activity (Note that this activity only focuses on cohesive forces and related phenomena, but this is a good launching activity to then cover the unique heat capacity, density, etc. These include cohesion, resistance to temperature change, and expansion during freezing. as a result of the presence of hydrogen bonds, water has some unique properties when compared to most other liquids.
Each water molecule can form a maximum of four hydrogen bonds with other water molecules, and Hydrogen bonds thus help to hold water molecules together.a special kind of bond, called a hydrogen bond, exists between water molecules where the + side of one molecule is attracted to the – end of another molecule,.This is because the structure of a water molecule results in one end of the molecule having an excess negative charge and the other end having an excess negative charge, water molecules are polar, that is each H 2O molecule has a slight + and - charge.
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