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This document details a biochemistry experiment conducted at st. Anthony’s college, san jose de buenavista, antique, focusing on the properties of water, including cohesion, adhesion, surface tension, and specific heat. The experiment involves group members testing water's behavior with and without dish soap, comparing it with alcohol, and observing its evaporation rates. The objective is to understand the role of these properties in the behavior of water, contributing to a deeper appreciation for water's indispensable role in life and the environment.
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San Jose de Buenavista, Antique HIGHER EDUCATION DEPARTMENT
Group Members: Daved Andrei Canete Aaron Junio Shanley Deanne T. Pingoy Jassey Songcayawon Geremy Claris Salvacion Tobin Reiber Santillan Jassey Songcayawon Hannah Mae Tajanlangit Instructor: Ms. Hannah Grace Gencianeo BSN - 1B December 30 , 2023
San Jose de Buenavista, Antique HIGHER EDUCATION DEPARTMENT Introduction Water is a remarkable substance with unique properties that contribute to its vital role in supporting life. One key property is cohesion, the ability of water molecules to stick to each other. This property is demonstrated by observing how many water drops can be held on the top of a coin, showcasing the cohesive forces at play.Adhesion, another aspect, is explored by comparing water and alcohol's ability to hold drops on the same surface. Dish soap, when added, disrupts water's cohesion, altering its behavior. Surface tension, a result of cohesive forces, is examined in the second demonstration using a paper clip on water's surface. Introducing a dish soap and water solution disrupts surface tension, affecting the paper clip's behavior. The impact of dish soap on water's surface tension becomes evident through this experiment. Specific heat, the amount of heat energy required to change the temperature of a substance, is explored in the third demonstration using water and alcohol. Observing their evaporation reveals the differences in their specific heat capacities. Determining which substance evaporates faster provides insight into their respective thermal properties. Theoretical Background: Water, with its simple yet unique molecular structure, plays a fundamental role in the physical and chemical processes that govern life on Earth. Its chemical formula, H₂O, signifies two hydrogen atoms bound to one oxygen atom. This arrangement results in a polar covalent bond, causing a partial negative charge on the oxygen atom and partial positive charges on the hydrogen atoms.
San Jose de Buenavista, Antique HIGHER EDUCATION DEPARTMENT Materials The materials needed were dish washing liquid, coin, alcohol, paper clip, plastic cup, dropper, and water. Other materials, tools, and equipment were facemask, hand gloves, and laboratory gown. Data Gathering Procedure I. Demonstration #1 (Cohesion) Place water drops on a coin and note the quantity. Repeat with alcohol and record the number of drops held. Apply dish soap to the coin and assess the water's drop-holding capacity. II. Demonstration #2 (Surface Tension) Place a paper clip on the water's surface. Introduce a dish soap and water solution and observe the changes.Discuss the effect of dish soap on surface tension. III. Demonstration #3 (Specific Heat) Observe the evaporation of water and alcohol. Compare the evaporation rates.Determine which substance evaporates faster. Results and Discussion Data and Observation
San Jose de Buenavista, Antique HIGHER EDUCATION DEPARTMENT I.Demonstration #1 (Cohesion) III.Demonstration # 3 (Specific Heat) Water Alcohol 9.03 sec. 2.25 sec. The results of the demonstrations unveil intriguing insights into the distinctive properties of water. In the cohesion and adhesion test, water exhibited a remarkable capacity to hold 30 drops on the surface of a coin, surpassing alcohol's performance at 26 drops. However, when dish soap was introduced, the cohesive forces weakened, and only 18 drops could be sustained on the soapy coin. This experiment underscores the impact of external factors, such as dish soap, on altering water's cohesive behavior. Moving on to surface tension, the paper clip initially floated on the water's surface due to cohesive forces creating surface tension. Yet, with the introduction of a dish soap and water No. of drops Water on coin 30 Alcohol on coin 26 Water on soapy coin 18
San Jose de Buenavista, Antique HIGHER EDUCATION DEPARTMENT Figure 1. Materials Figure 2. Placing water drops on a coin
San Jose de Buenavista, Antique HIGHER EDUCATION DEPARTMENT Figure 3. Placing alcohol drops on a coin Figure 4. Applying dish soap to the coin Figure 5 .Placing a paper clip on the water's surface
