Lab manual

How will each of these effect the volume of air the

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Unformatted text preview: or the constant k. 3) Since we know from the ideal gas law that k=nRT, then n=k/RT. Assume that the gas inside the cylinder is at 19o C (approximately room temperature). Calculate the number of moles of gas in the cylinder, n (R=82.06 mL*atm/mol*K). HINT! Don’t forget to convert your temperature to Kelvin! 4) What is your estimate for absolute zero from your plot of volume versus temperature? List as many sources of error as you can. 5) In the Poiseuille part of the experiment, how did the volume of gas change as the radius of the straws change? 6) What sources of error exist for this experiment, and how would these sources of error affect your results? 7) You have a very non-technical patient suffering from emphysema. Explain in your own words using simple terms how Boyle’s Law and Poiseuille’s Law are teaming up against him or her. 8) Explain, in simple terms, exactly what is happening at absolute zero (assuming it can be reached). Why is this a theoretical limit, rather than a real limit? 9) A patient arrives in the emergency room who needed an emergency Tracheotomy. A hole was cut into this patient’s Larynx at the base of the neck, and a tube, rather smaller than the Trachea, was inserted into the Trachea. Two effects are going on; the length of the breathing tube is shorter, but the radius is smaller. How will each of these effect the volume of air the patient can receive? Looking carefully at Poiseuille’s Law, do you expect the net flow to be smaller or greater? Why? (HINT! Look at the powers involved in the radius and length of tube.) Dakota State University page 1 38 of 232 Experiment 11: Acids and Bases General Chemistry I and II Lab Manual Experiment 11: Acids and Bases Purpose: To gain experience in the properties of acids and bases Purvey: To sell or provide (and I’ll bet you thought it meant something else, didn’t you?) Background: See “Basic Laboratory Procedures”; Litmus paper Introduction: It does not take a great stretch of the imagination to recognize that, in some way, acids and bases are nothing more than a specialized class of ionic compounds, at least in the Arrhenius definition. So why, then, are acids and bases important enough to warrant their own place in a first year course? Because, when we are talking about acids and bases, we are talking about the chemistry of water-based solutions (typically), and water is of critical importance to us as human beings. Think about it; 70% of the earth is occupied by water. YOUR BODY is 90% water. When we talk about water chemistry, we are talking about the chemistry that keeps both this planet, and us, alive, and while water occupies every day of our lives, in one way or another, it is more exotic than you might think. Oh, sure, I know what you’re saying; “what’s so exotic about water? I can get it from my tap; I use it for a hundred things every day, it falls out of the sky!” That’s true; on this planet, water is abundant. But did you ever stop to consider that water is the only compound know...
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