【Test Your Knowledge】Basic Chemical Engineering Knowledge (178) Please hide your replies

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This post was last edited by wbp on 2009-9-2 at 15:25. In accordance with the forum’s rules, the maximum score for this activity is 15 Wealth points; giving scores based on charm is prohibited. Friendships and duplicate ratings are also declined. To encourage active participation from members, the top 5 correct answers receive a full score; for the remaining answers, 10–15 wealth points are awarded for every correct answer, while 8–12 wealth points are given for each incorrect answer. 2 mistakes result in 6–10 wealth points lost; the rest receive encouragement bonuses of 2–6 wealth points. 1 Deionized water prepared by ion exchange can effectively remove organic substances. 2 Add 20 mL of 1 mol/L H2SO4 solution to another 20 mL of 1 mol/L H2SO4 solution; the concentration of the resulting mixture is 2 mol/L. 3 The reaction of ethylene gas-phase hydration to ethanol is an irreversible endothermic gas-solid phase catalytic reaction. 4 Nitric acid is a strong oxidizing agent with reactive properties; it is volatile and tends to react chemically with other substances. 5 Formaldehyde is produced from methanol as a raw material, through the reduction of methanol. 6 When shutting down a centrifugal pump, first close the pump’s outlet valve to prevent the liquid in the discharge pipe from flowing back. 7 The head and lift height of a centrifugal pump are the same; both represent the distance over which liquid is pumped to a higher level. 8 To increase the production capacity of the dust collection chamber, the main measure is to raise its height. 9 The vent valve can be opened only after the heat exchanger is operating normally. 10 Throttling expansion causes the temperature of liquid ammonia to drop. All members now have the permission to use hidden replies; please cooperate actively. Starting from this issue, no scoring will be given in principle without hiding it. Thank you all! To hide the method, click here: Hide Method. Answers must be submitted from the same IP address, and only the first post is valid. Also, be careful when posting; edits are invalid! Answer to Issue 178: XXX√X √XXXX√