Students often need to answer control questions to complete the report: Answer Summary
Surface tension as temperature increases because molecules move faster and weaken intermolecular bonds. What if you add soap? Students often need to answer control questions to
It is determined by the strength of intermolecular attraction; different molecules "stick" together with different forces. You will need a pipette or medicine dropper,
You will need a pipette or medicine dropper, a beaker of water, a small empty beaker for collecting drops, sensitive scales (electronic or balance), and a caliper (shtangentsirkul) to measure the tube diameter. 2. Measure the Diameter Use the caliper to measure the inner diameter of the dropper tip. Convert this value to meters ( 3. Collect Data Weigh the empty beaker ( M1cap M sub 1 Carefully count exactly drops (e.g., 50 or 100 drops) into the beaker. Weigh the beaker with the water ( M2cap M sub 2 Calculate the total mass of the water: Calculate the mass of a single drop: 4. Calculate Plug your values into the formula: Convert this value to meters ( 3
Soap is a surfactant (PAV) that significantly the surface tension of water. Why do drops form spheres?