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Which of the following is the most effective buffer system for a pH value of 4.45? a. H2CO3/HCO3- (K1 = 4.4 * 10-7) b. HCO3-/CO32- (K2 = 4.7 * 10-11) c. H2S/HS- (K1 = 1.0 * 10-7) d. HC2O4-/C2O42- (K2 = 5.0 * 10-5) e. H3PO4/H2PO4- (K1 = 7.5 * 10-3) I Think (d) not really...
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difference between aluminium chloride and aluminium flouride
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with 0.1M KHSO4 what is the gram equivalent?
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how many liters of oxygen can be produced from the decomposition of 10.0 g of KClO3 at 30 degrees C and a pressure of 720.o torr?
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In the context of a silicon-based semiconductor, match each of the following descriptions to the type of semiconductor. dopant:boron contains electron holes contains extra electrons dopant:phosphorus n-type semiconductors or p-type semiconductors
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how many moles must be added to 0.5 L of water to make a 0.0015M solution?
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Molar Concentration of the nitrate in Pb(NO3) plus 2NaI
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what volume will the Cl2 occupy at 107c and 680 torr?
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How many moles of HCl can form from 0.12mol of Cl2?
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what is the half life of chlorine-39 if an 800 gram sample decays to 25.0 grams in 127.5 days?
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Sample Questions
- 1. For organic chemistry, what is a concerted shift? How do things like acids or heat affect them? What other factors affect them?
- 2. Which of the following reactions is an acid-base neutralization reaction? Why are the rest of the answers incorrect?
- A. AgNo3 (aq) + NaI (aq) --> AgI (s) + NaNO3 (aq)
- B. S8(s) + 8O2 (g) --> 8SO2(g)
- C. Na3PO4 (s) + 2H2O (l) --> H2 (g) + 2NaOH (aq)
- D. Ca (OH)2 (aq) + 2HI (aq) --> CaI2(aq) + 2H2O (l)
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