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Classify the following room-temperature reactions as homogenous catalysis or heterogeneous catalysis:
a. reaction of carbon monoxide and oxygen in a presence of platinum
b. reaction of sulfur dioxide and oxygen over vanadium oxide
c. synthesis of ammonia gas from nitrogen and hydrogen in a presence of potassium oxide
d. reaction of persulfate ions and iodide ions in water in presence of iron (II) ions
e. reaction of 2,3-dihydroxybutanedioate ions and hydrogen peroxide in presence of cobalt (II) ions
List possible manipulation errors that might contribute to the following errors in results
A stock solution of lactic acid is 0.04M and a stock solution of lactate is 0.25M. Calculate the pKa of lactic acid given that at these concentrations the pH is 3.90
Identify the following compound made of H, N, and O described below. Write a Lewis structure that is consistent with the information given.
Use reduction-potential values to explain which halides can be oxidized by Fe3+ or by MnO4- in acidic solution?
If the two flasks are connected through a stopcock and the stopcock is opened, what is the partial pressure of helium?
At 500 K, PCl5 decomposes rather extensively into PCl3 and Cl2. If 1.000 moles of PCl5 is placed in a 1 liter box at 500 K, 13.9 % of it decomposes into PCl3 and Cl2. Calculate K for PCl5(g) PCl3 + Cl2
Solid aluminum reacts with aq H2 SO4 to form H2 gas and aluminum sulfate. when a sample of Al reacts, 425 mL of H2 gas is produced at 24 degree celsius at a press of 744 mmHg. How man grams of Al reacted?
Calculate the work of expansion of the gas in joules (1 J = 9.87 10-3 atm·L). Assume all the energy is used to do work.
How would you prepare 350mL of a single solution containing 150mM Tris, 5mM glucose, and 5 mM Nacl?
Write the balanced net ionic equation for the reaction between KMnO4 and Na2S2O3 in neutral
A solution is prepared by dissolving 20.0 g of K2HPO4 and 25.0 g of KH2PO4 in enough water to produce 1.0 L of solution. What is the pH of this buffer
formic acid is titrated with 0.50 M sodium hydroxide, calculate the pH before any of the titrant (NaOH solution) is added and after 15.0 mL of the titrant has been added.
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