What visibile reactions can be observed when you mixed bleach with NaI(aq)?

2. Hemoglobin is a protein that carries oxygen in the blood. It absorbs light strongly at a wavelength of 400 nm, which gives blood its red color. A solution of hemoglobin is diluted to 10 times its original volume (1.0 mL hemoglobin + 9.0 mL water). The diluted solution has an absorbance value of 0.354. a) Determine the absorbance value of the original solution. Explain how you arrived at your answer. b) It would be simpler to measure the absorbance of the original solution directly. Explain why it is better to dilute the solution before measuring the absorbance for this sample. 3. Why is it important not to touch the sides of the cuvette with your fingers?

25.00 mL of a solution containing KIO4 is treated with excess potassium iodide. IO4- + 8H+ + 7I- → 4I2 + 4H2O The resulting solution is titrated with 0.15 M sodium thiosulfate pentahydrate. The average titre was 21.76 mL.  I2 + 2S2O32- → 2I- + S4O62- What mass of KIO4 (in g) was dissolved in water to make the original solution?

QUESTION 37 Based on the provided chart of reduction potentials, rank the following chemicals from strongest (1) to weakest (5) oxidizing agents. Half-Reaction End (V) +2.87 +1.51 +1.36 +1.33 +1.23 +1.06 +0.96 +0.80 +0.77 +0.68 +0.59 +0.54 +0.40 +0.34 0 [defined] -0.28 -0.44 -0.76 -0.83 -1.66 -2.71 -3.05 F2(8)+2e-2F (aq) MnO4 (aq) +8H(aq) +5e Mn²(aq) + 4H₂O(1) Cl₂(8)+2e-2 Cl(aq) Cr₂O72 (aq) +14 H(aq) + 6e2 Cr³(aq) + 7 H₂O(1) O₂(g) +4 H(aq) +4e-2H₂O(l) Brz(1)+2e-2 Br (aq) NO3(aq) + 4H(aq) + 3e NO(g) + 2H₂O(1) Ag (aq)+eAg(s) Fe³+ (aq) + e Fe²(aq) O₂(g) +2H(aq) +2e H₂O₂(aq) MnO4 (aq) + 2 H₂O(!)+3e MnO₂(s) + 4 OH(aq) 12(3)+2e-21 (aq) O₂(8)+2H₂O(1)+4e-4 OH(aq) Cu²(aq) +2e 2 H(aq)+2e Ni2(aq) +2e Fe (aq) +2e Cu(s) H-(8) Ni(s) Fe(s) Zn2(aq) +2e →→→ Zn(s) 2H₂O(1)+2e H₂(g) + 2OH(aq) Al(s) Al³(aq) + 3 e Na (aq)+eNa(s) Li' (aq) +eLi(s)