6 explain why it is better to have a sharp needle

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Unformatted text preview: s slope is the value of the constant k(=nRT). Charles’ Law: Create a graph to plot volume versus temperature, but be SURE that the temperature scale extends at least to –600 o C, and that the volume scale extends to 0 mL. Carefully plot your data points. Extrapolate the line with a straight edge to V=0, and read the resulting temperature. This is your estimate for absolute zero. Dakota State University Page 132 of 232 Experiment 10: Gas Laws General Chemistry I and II Lab Manual Poiseuille’s Law: From the diameter of the straws, calculate their radius. Calculate the fourth power of this radius (r4 = r*r*r*r). Dakota State University Page 133 of 232 Experiment 10: Gas Laws General Chemistry I and II Lab Manual Gas Laws Experiment: Boyle, Charles and Poiseuille Pre-Lab Questions 1) If we have a system where the volume of gas that can flow through a tube in 1 second is 4.2 L, what volume will be able to flow through the tube if we halve the length of the tube? 2) What is the function of the objects we are resting on top of the syringes in the Boyle’s Law portion of this experiment? 4) What must we be careful of in the Charles’ law portion of this experiment where we are putting the syringe in the boiling water? 5) What specifically are we measuring with the graduated cylinder in the Poiseuille’s Law portion of this experiment? 6) Explain why it is better to have a sharp needle rather than a dull one when receiving a shot in terms of pressure and the amount of force necessary to break through the skin. 7) Why is it important to keep track of the contaminated side of the straw in the Poiseuille’s Law part of this experiment? Dakota State University Page 134 of 232 Experiment 10: Gas Laws General Chemistry I and II Lab Manual Gas Laws Experiment: Boyle, Charles and Poiseuille Report Sheet Boyle’s Law: Syringe Inner Diameter: cm Syringe Inner Radius: cm Syringe Inner Radius: in Syringe Inner Area: in2 Object Mass (g) Object Mass (kg) Dakota State University Object Mass (lb) Pressure Exerted by Object (psi) Pressure Exerted by Object (atm) Volume of Gas (mL) Total Pressure (atm) 1/(Total Pressure) (atm-1 ) Page 135 of 232 Experiment 10: Gas Laws General Chemistry I and II Lab Manual Charles’ Law: Tempera ture in o C Dakota State University Volume in mL Page 136 of 232 Experiment 10: Gas Laws General Chemistry I and II Lab Manual Poiseuille’s Law: Straw Diameter (cm) Straw Radius R (cm) Dakota State University R4 (cm4 ) Time for run 1 (sec) Volume for run 1 (mL) Time for run 2 (sec) Volume for run 2 (mL) Time for run 3 (sec) Volume for run 3 (mL) Page 137 of 232 Experiment 10: Gas Laws General Chemistry I and II Lab Manual Gas Laws Experiment: Boyle, Charles and Poiseuille Post-Lab Questions 1) Does the plot of volume versus total pressure demonstrate the inverse proportionality of volume and pressure? If so, why? If not, what were you expecting to see? 2) From the plot of volume versus 1/pressure, calculate the slope. This is the value f...
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