Exam Review and Lab Updates

Identifying Measurement Errors: A measurement of "five to three" is considered an "atrocious" and "egregious error," likely indicating a significant mistake in the experimental process.
Proper Equipment Handling: To avoid such errors, it's crucial to handle lab equipment (e.g., cuvettes or similar vessels) correctly. The advice given is to "grab it by the ribs" rather than the "clear side," as improper handling can lead to inaccurate readings.

Measuring Unknown Samples: Unknown samples are run through a colorimeter to obtain an absorbance reading. This absorbance value is often used for specific assignments, and obtaining an accurate reading is critical for departmental compliance.
Importance of Blanks: When using a colorimeter, if a blank solution is not provided, one should always be set. The principle is that a zero concentration should always yield a zero absorbance (i.e., the y-intercept should be $0$ ).
Troubleshooting Y-Intercept: Sometimes, a colorimeter may provide an unwanted y-intercept that deviates from zero. This must be corrected because the true y-intercept for a blank (zero concentration) is always zero.
Correction Methods: To ensure accuracy, either a blank is used so the instrument correctly interprets the zero point, or the y-intercept is manually set to equal zero.

Original Exam Date: The exam was originally scheduled for next Tuesday.
Revised Exam Date: The exam has been postponed to the Tuesday following next Tuesday.
Reason for Postponement: The instructor desires more time for a comprehensive review session with students before the exam.
Review Session: A review session will be held tomorrow in room $04:12$ . The review will utilize a Jeopardy-style application to facilitate an interactive and score-keeping format.
Exam Coverage: The upcoming exam will cover a range of topics, including:
- Density
- Balancing equations
- Empirical formula
- Concentration
- Dilutions
- Beer's Law (a "freebie" value of $5.63$ is mentioned, implying a frequently encountered or specific constant/value related to Beer's Law problems).
Weekly Schedule Breakdown:
- Tomorrow: Exam review session.
- Next Tuesday: Regular lab session.
- Following Tuesday: The rescheduled exam.
New Chapter Introduction: The next chapter (Chapter $25$ ) is expected to begin an introduction possibly as early as next Monday.
Review Sheet: The review sheet will be discussed tomorrow, with any remaining questions addressed on Monday.

Oxidation and Reduction Worksheets: Students will be working on oxidation and reduction worksheets that were previously introduced or discussed during the last class session, presumably on Monday.