EXTRA CREDIT QUESTIONS TIPLE CHOICE. Choose the one alternative that best comple

Question

EXTRA CREDIT QUESTIONS TIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Components of Air Nitrogen Oxygen Argon Mole Fraction 0.781 0.209 0.010 What is the partial pressure or argon (in torr) in the atmosphere when the atmospheric pressure is 7 torr? A) 750 B) 760 C) 586 D) 157 E) 611 2) Which of the following is not one of the 12 principles associated with green chemistry? 2) A) distribution of chemical by-products into oceans B) inherently safer chemistry for accident prevention C) less hazardous chemical syntheses D) use of renewable feedstocks E) promotion of the use of catalysts 3) The lime-soda process is used for large-scale water-softening operations, CaO is added to 3) A) cause precipitation of iron and magnesium as FezMg04 B) reduce the pH to 3-4 C) oxidize Fe2+ to insoluble Fe2O3 D) remove most Al3+ as solid Al(OH) E) cause precipitation of magnesium as Mg(OH)2 4) The sourcet(s) of sulfur dioxide in the atmosphere is/are 4) A) fossil-fuel combustion B) volcanic gases C) forest fires D) bacterial action E) all of the above

Explanation / Answer

total pressure = 1 atm = 760 torr

partial pressue = 0.01*760= 7.60torr

correct option A

2. option A is correct answer

3. Option E is correct answer

4. option E is correct answer

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