02_01_powlr

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Orange Coast College *

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A180

Subject

Chemistry

Date

Jan 9, 2024

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docx

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2

Uploaded by MinisterPolarBear3443

Properties of Water Lab Report Instructions: Investigate the properties of water by choosing one experiment to conduct. Use the following lab template to ensure all lab report components are included. Submit your lab report to your instructor when completed. Objective(s): Identify the purpose of your investigation or the question you are attempting to answer. Be sure to tie in the property of water you are testing. Background Knowledge : Polarity and hydrogen bonding are two key factors that contribute to the unique properties of water. Since water is made of cohesive molecules, it causes water droplets to stick together, and water is adhesive and cohesive. Experiment: Title: Investigating Cohesion Objective: The goal is to try and figure out how much water droplets can fit onto a penny without it overflowing the penny. Hypothesis: If i drop a small amount of water onto the penny then i believe i can put sixteen water drops on the penny without it spilling and overflowing, Variables: Independent Variable: The trails Dependent Variable: The number of water droplets. Controlled Variable: Water and the penny Materials: Penny, water, paper towel, dropper Procedure: The procedure should be clear and detailed, so that others can repeat it. The details should be specific in how the procedure changes the independent variable, controls all variables that need to be controlled, and observes or measures the resulting changes to the dependent variable. Data and Observations: Present all data and observations in a neat and organized manner. Include tables and graphs where appropriate/possible. Trials Total Drops of Water
1 15 2 16 3 17 Average 17 Conclusion: Include the following as a summary paragraph in the conclusion of your lab report: Analysis of the results of the experiment Rationale for the support or rejection of the hypothesis Description of how the investigation could be tested further Conclusion : My hypothesis was not to correct, more than sixteen drops of water can fit on the penny's surface. The penny had an average of seventeen water drops on its surface. If I were to repeat the same experiment I should be more careful and precise with putting drops on the penny, to have more accurate results. Questions: Answer these questions in complete sentences using evidence from your investigation. The properties of water are an essential part of what makes water unique. What affect does the properties of water have on Earth’s surface and its systems? When cohesion and adhesive hold water together due to attraction between them. The heat vaporization is part of the properties that affect the earth's surface, and its also the reason water is able to absorb heat temperatures and energy. The properties of water can affect the earth's surface from chemical to physical ways. How does water’s molecular structure affect solubility of substances on Earth? Provide a real-world example.? The water affects solubility because water has the ability to make bonds with positive and negatively charged molecules. Both the charged molecules aid the solubility with other different substances. Explain how all the properties of water are related. Provide an example to describe the interconnectivity of each property. Be sure to include hydrogen bonding, polarity, surface tension, capillary action, cohesion, adhesion, high specific heat, and expansion upon freezing. The main properties are polarity cohesion and adhesion. Cohesion is H20 molecules that are capable to create surface tension. Adhesion has hydrogen bonding that holds water molecules with other molecules. Specific heat allows evaporative cooling and happens when heat energy is transferred to water molecules.
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