STR updates

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Chem LabRep questions :D

I. 1. What can you conclude about the reaction 2CrO_4­^2-_(aq) à Cr₂O₇^2-_(aq) and its dependence on H⁺_(aq)? Balance this equation by adding the proper number of H⁺ ions and H₂O molecules.

2. What can you conclude about the reaction Cr₂O₇^2-_(aq) à 2CrO_4­^2-_(aq) and its dependence on OH^-_(aq)? Balance this equation by adding the proper number of OH^- ions and H₂O molecules.

II. 1. What can you conclude about the relative equilibrium concentrations of CrO_4­^2-_(aq) in each of the solutions of 0.1 M K₂CrO₄ and 0.1 M K₂CrO₇?

2. Use the equations you balanced in questions 1 and 2 of part I to explain the results you’ve obtained in steps d and e of part II.

3. Summarize in 1 to 2 sentences your result with chromate-dichromate equilibrium and its application of Le Chatelier’s principle.

III. 1. (a) Which substances in solution caused the color to change from that of the Cr₂O₇^2-_(aq) ion to that of CrO_4­^2-_(aq) ion? (b) Which substances in solution cause the reverse color change?

2. What ionic species do the solutions you listed in question 1a have in common? In question 1b?

3. Give an explanation of the results you noted when (a) ethyl alcohol was added, (b) the solution of NH_3(aq) was added.

4. On the basis of your conclusion made in question 2, predict some additional substances which solution might have the same effect on the 2CrO_4­^2-_(aq) ↔ Cr₂O₇^2-_(aq) equilibrium as those you categorize in questions 1a and 1b.

Batch Shirt

To all class presidents: Please submit memo 1 (yung shirts thing) to Jeks Espina (IV-Graviton) by tomorrow 4:30 pm!

Photon (and everyone else), your reply slips, please. 

Reminders

• Please submit the yearbook payment reply slips to your president. Presdients, forward it to any batch council officer. (Photon and Tau, you have yet to forward yours).

• If you would like to request for a sponsorship, please contact Lance Calub or indicate it in youre reply slip.

• If you plan on depositting the P3000 directly to the batch bank account, don't forget to email the scanned deposit slip or give the actual deposit slip to Lance Calub or Kim Ednalino.

• For the yearbook submissions. check here if you passed everything.
Email your submissions to your collector and me (kim_ednalino@yahoo.com).

CAT

CAT make-up schedules tomorrow has been cancelled due to 2-week moratorium on activities. 
Those who wish to ask for pointers may approach any cadet officer. 
Also, please be informed that until further notice, all seniors, excluding officers, shall wear rubber shoes for CAT. Thank you.

APA in detail

APA 1
APA 2

click it :)

Batch Shirt

Votation for the Batch Shirt will be on Friday.
Mechanics will be announced to the presidents.
Please accomplish all votes per class by 2:50 pm.
Presidents, pass the voting sheets to the batch council. 

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ACET Forms are due on July 15. 
All forms must be passed to the Guidance Office by this day.