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What are the adverse health and environmental effects associated with each of the following?
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Chemistry In Focus
- Why does ozone deplete severely over Antarctica each October, but not over other areas of the planet?arrow_forwardPropane, C3H8, is a hydrocarbon that is commonly used as a fuel. (a) Write a balanced equation for the complete combustion of propane gas. (b) Calculate the volume of air at 25 C and 1.00 atmosphere that is needed to completely combust 25.0 grams of propane. Assume that air is 21.0 percent O2 by volume. (Hint: we will see how to do this calculation in a later chapter on gasesfor now use the information that 1.00 L of air at 25 C and 1.00 atm contains 0.275 g of 2 per liter.) (c) The heat of combustion of propane is 2,219.2 kJ/mol. Calculate the heat of formation, Hf of propane given that Hf of H2O(l)=285.8 kJ/mol and Hf of CO2(g)=393.5 kJ/mol. (d) Assuming that all of the heat released in burning 25.0 grams of propane is transferred to 4.00 kilograms of water, calculate the increase in temperature of the water.arrow_forwardWhat is the biological importance of stratospheric ozone? Explain.arrow_forward
- Dinitrogen monoxide, N2O (commonly called nitrous oxide), is prepared by the careful decomposition of ammonium nitrate and is used as an oxidizing agent in rocket engines as well as a weak general anesthetic (where you may know it as laughing gas). However, it is also known to be a powerful greenhouse gas. In a Science magazine article, it was stated that Human activities may be causing an unprecedented rise in the terrestrial N2O source. Marine N2O production may also rise substantially as result of eutrophication, warming and ocean acidification. [L. A. Codispoti, Science, Vol. 327, pp. 1339-1340, 2010.] The powerful greenhouse gas N2O is used as a propellant in cans of instant whipped cream. (a) Draw a Lewis electron dot structure for N2O, and specify the formal charge on each atom and the molecular geometry. (b) The atom connections are NNO. Why is the connection NON not likely? The highest N2O concentration observed in the ocean is about 800 nM (nanomolar). At this concentration, what is the mass of N2O per liter?arrow_forwardPlease help me answer these subunits!arrow_forwardD is soluble in water. Its water solution is basic. When solid substance is heated, its volume expands and water droplets are observed around the tube but there is no color change. D is __________. a. Na2B4O7.10 H2O (borax) b. Na2SO4 (sodiumsulfate) c. C12H22O11 (sugar) d. NH4Cl (ammoniumchloride)arrow_forward
- C. The lead(II) oxide was weighed before and after the additions. d. 19 18 17 16 before g 15 ii. What method is used to separate the mixture in stage 3? 14 iii. What term is used to describe the unreacted lead(II) oxide? 13 12 9 Use the balance diagrams to work out the mass of lead(II) oxide added to the dilute nitric acid. after i. How would the student know when all of the dilute nitric acid had reacted in stage 2?arrow_forward14. A 50.0 g sample of SAE 15W-40 motor oil is sent for testing. It was found to contain 13.4 ug of lead. What is the concentration (in M) in the oil? (doil = 0.87 g mL-l) A: 1.1 х 10-6arrow_forward2 What is reservior in environmental chemistry? What are O1D (O singlet D) and O3P( O priplet P)? Not sure if it's written in this way.arrow_forward
- Which option is a correct representation of the missing information in the Figure? H20 ? KMNO, A B HO OH но. OMNO4 'OH OMnO4 А. В В. А С. D D. Carrow_forward58. Apply Graph mass versus volume for the data given in the table.What is the N, 20.95% O 0234 Ar and 0.04% CO, and other gases. 51. infer from Figure 17 how long the ozone hole lasts. 58. Apply Graph mass versus volume for the data given in the table wi slope of the line? 7.5 12 15 22 Volume (cm³) Mass (g) 24.1 38.5 48.0 70.1arrow_forwardWhich of the following chemical tests cannot be used distinguish the two compounds below: Lucas test OH O Tollen's test Ohot, acidic KMnO4 Jones test VS. COarrow_forward
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