Physics and Astronomy

Chemistry Relay

They will be required to answer questions and perform tasks at each of three or four stations.
Each series of questions will lead up to one final answer which the last team member must give to the judge on a piece of paper provided. The purpose of this experiment is to identify an unknown liquid.

Example: Each team will be required to determine the volume of an unknown NaOH solution required to exactly neutralize one half of a 50.0 ml 0.1 N HCl solution.

Purpose To gain experience in chemical analysis.
Participants Teams of up to four.
Station 1

Materials 1: A retort stand, burette, pipette, unknown solution, indicator, Erlenmeyer flask, standard HCl

Procedure 1: A student must perform a titration against the standard HCl using the unknown NaOH.
After determining the volume of NaOH needed to reach the end point, the student writes this and only this, on a piece of paper, jumps a hurdle and runs to the next station where the next member of his/her team waits.

Station 2

Materials 2: Pencil, paper, eraser and the molarity of the HCl solution from station 1.

Procedure 2: This student must compute the molarity of the NaOH solution based on the volume used at station one. The student then long jumps over a water hole and gives the answer to the next team member.

Station 3 Materials 3: Pencil, eraser, answer from station #2.

Procedure 3: Student must compute the answer to the initial question which will be provided on a cue card. After obtaining the answer, the student must toss a soft ball through a hoop before giving the answer to the judge.

  1. Team members may cheer on each other, but may not provide assistance at any of the stations.
  2. No calculators will be allowed. All calculations will be easily done by hand
  1. Points will be awarded on the basis of correct answers and the fastest time.
  2. A maximum of 25 points will be given for the answer closest to the actual one; other teams will be awarded points relative to this.
  3. A maximum of 25 points will be given to the team with the fastest time, other teams will be scored relative to this.
  4. Speed and accuracy are therefore, important in this event.
Source Youth Science Foundation Science Olympics Manual.

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