water and carbon


Barry University

Question Description

Complete the following worksheet and case study. Be detailed in your responses, and read the questions carefully. Also complete the attached case study.

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Introductory Chemistry Homework Due: For many of the questions below you will need to refer to a periodic table: https://ptable.com/#Properties 1. Compare and contrast a major similarity and difference between polar covalent bonds and ionic bonds. It may help to define them before listing a similarity and difference. 2. Define both ionic and hydrogen bonds, and state a similarity between ionic bonds and hydrogen bonds. Explain the similarity, and the reason behind the similarity. 3. Can you draw the structure of potassium chloride (KCl) and methane (CH4) by just looking at a periodic table? What kind of bonds are formed? Are these polar or nonpolar? Why? 4. In C2H4, how many bonds are between the two carbons? 1? 2? 3? Why? What is the molecular mass of C2H4? How do the protons, neutrons, and electrons from each atom contribute to that mass? You will need to refer to a periodic table. 5. Write a summary describing why each of the following properties of water can be attributed to its polarity. In addition to defining each, you must explain how the polarity of water (and hydrogen bonds) plays a role. Please keep the bullet point format in your response. a. b. c. d. e. Water's activity as a solvent Different states of water Water's specific heat capacity Waters heat of vaporization Water's cohesive and adhesive properties 6. Watch the following video: https://www.youtube.com/watch?v=uXaP43Zbz7U. Draw the structure of PTFE (Teflon) including the sharing of electrons (covalent bonds). Why do the atoms of PTFE (Teflon) not react with other substances (i.e. “non-stick”). Think about where fluorine is in the periodic table. 7. Don’t forget to complete the attached Properties of Water Case Study! Experiment # Experiment Name Detalis of how the experiment was conducted 2 3 Pepper, Water, and Soap Blooming Flower Water Balloon 4 Ethanol Dissolving 5 Plastic and Glass 1 Experimental Results What property of water explains the results? Why? Directions • Play the video of an experiment being performed. • Fill out the attached worksheet for every experiment. • Details of how the experiment was conducted • Experimental Results • What property of water explains the results? Explain why. What are some of the properties of water? • Solvent • Cohesion • Adhesion • Found in different states • Polar/Hydrogen bonds • pH • Specific Heat Capacity • Heat of Vaporization Experiment #1 – Pepper, Water, and Soap Experiment #2 – Blooming Flower Experiment #3 – Water Balloon Balloon Filled with Air Balloon Filled with Water Experiment #4 – Ethanol Dissolving Hint: Experiment #4 – Ethanol Dissolving Ethanol Water Experiment #5: Water on glass and plastic • At 10:00am I emptied the dishwasher. I noticed several plates were still wet, so I set them out to dry. Some of the plates were plastic, whereas others were glass. • At 11:00am I noticed that all of the glass plates were dry, whereas the plastic plates were still wet. How could this be? • Hint: The strength of adhesion is stronger between water and glass than water and plastic (glass is more polar). Plastic Glass ...
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