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A certain calorimeter absorbs 65 J/o
C. If 55.0 g of 67o
C water is mixed with the
calorimeter’s original 50.0 g of 23o
C water. Calculate for the final temperature of the
mixture?
. Show the hydrolysis of ADP to AMP. Include in the reaction the amount of energy produced.
Classify the following into elements, mixture and compound.
Soap,
water,
blood,
urine,
urea,
antimony,
vanadium and
limestone
A certain calorimeter absorbs 65 J/oC. If 55.0 g of 67oC water is mixed with the calorimeter’s original 50.0 g of 23oC water. Calculate for the final temperature of the mixture?
1. Incoming wastewater, with BOD5 equal to about 200 mg/L is treated in a well-run secondary treatment plant
that removes 90% of the BOD. You are to run a 5-day BOD test with a standard 300 mL bottle, using a mixture
of treated sewage and the dilution water (no seed). Assuming that the initial DO is 9.2 mg/L,
a. Roughly, what maximum volume of treated wastewater should you put in the bottle is you want to have at
least 2 mg/L at the end of the test (filling the rest of the bottle with water)?
b. If you make a mixture of half water and half treated wastewater, what DO would you expect after 5 days?
2. A mixture consisting of 30 mL of waste and 270 mL of seeded dilution water has an initial DO of 8.55 mg/L;
after 5 days, it has a final DO of 2.40 mg/L. Another bottle containing just the seeded dilution water has an initial
DO of 8.75 mg/L and a final DO of 8.53 mg/L. Find the 5-day BOD of the waste.
1. Two bottles at the same temperature containing hydrogen sulphide (H2S) and ammonia (NH3) are placed at equal lengths from you and are opened at the same time. Which gas would you smell first?
calculate normality and titre of koh -solution (volume 5.45 ml) if it is necessary for the titration 6.7 ml h2so4-solution with cn=0.1025 mol/l
A solution of HClO4 was standardized by dissolving 0.4008 g of primary-standard-grade HgO in a solution of KBr:
HgO(s) + 4Br- + H2O HgBr42- + 2OH-
The liberated OH- consumed 43.75 mL of the acid. Calculate the molar concentration of the HClO4.
Balance in acidic medium. Show step by step process.
Iron (solid) reacts with hydrochloric acid (liquid) to form aqueous iron(II) chloride and gaseous
hydrogen.
