2014 Experiement 1.pdf

# 2014 Experiement 1.pdf - Pre-lab Assignment(3 pages 1...

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Pre-lab Assignment (3 pages) EXPERIMENT 1 PERIODIC PROPERTIES 1. (2 pts.) In the box below, list the chemical symbols of all the elements in Part B for measuring conductivity. 2. (1 pt.) In the box on the right, enter the symbol of the element that would be found inside the instructor’s fume-hood. 3. (2 pts.) Calculate the mass of glucose required to be dissolved in 10.0 mL of water to make a solution of approximately 0.20 M in concentration. Due to low concentration, you may assume the final volume of the solution is 10.0 mL. Enter your answer in the box and show work below. MW of glucose = 180.16 g/mol Volume of solution ≈ 10.0 mL (0.20 mol/L)(0.0100 L)(180.16 g/mol) = 0.36 g 4. (2 pts.) Calculate the mass of ammonium sulfate crystals required to be dissolved in 10.0 mL of water to make a solution of approximately 0.20 M in concentration. You may assume the final volume of the solution is 10.0 mL. Enter your answer in the box and show work below. MW of (NH 4 ) 2 SO 4 = 132.14 g/mol (0.20 mol/L)(0.0100 L)(132.14 g/mol) = 0.26 g 5. (2 pts.) Calculate the mass of potassium chloride required to be dissolved in 10.0 mL of water to make a solution of approximately 0.20 M in concentration. You may assume the final volume of the solution is 10.0 mL. Enter your answer in the box and show work below. MW of KCl = 74.55 g/mol (0.20 mol/L)(0.0100 L)(74.55 g/mol) = 0.15 g 6. (5 pts.) You will measure the conductivity of several solutions in Step 13 of this experiment. Based on the names of the solutes/solutions, separate the solutes into three naming categories and enter the molecular formula of each solute in the appropriate boxes below.

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• Spring '08
• HOCKINGS
• Chemistry, Chemical bond, Pauling, d. p-type semiconductors

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