CH301 Worksheet 3. Practice exam questions for Chapters 2 through 4. For each problem, identify the concept(s)you must use to answer the question (i.e. limiting reagent, percent yield, nomenclature, etc.) and describe the steps youwould take to answer the question successfully. Then you can solve it if you would like.1. Predict the products if a reaction occurs when magnesium metal and aqueous nickel chloride are mixed.a. MgCl(aq) and NiCl(aq) Problem type(s): b. Ni(s) and Cl2(g) How would you solve it?c. Mg(s) and Ni(s) d. MgNi2(aq) and Ni(s)e. MgCl2(aq) and Ni(s)2. An aqueous waste stream contains the toxic metal Cr3+. Which substance, whenadded to the water, will precipitate the chromium?a. NaOH Problem type(s): Problem type(s):b. NaNO3 How would you solve it?c. HNO3 d. NaCle. NaCH3CO23. What volume of H2O must be added to a 100 ml of 0.2 M HCl to produce a 0.002 M solution? (Hint, read what isbeing asked for very carefully.)a. 10 liters Problem type(s): b. 9.9 liters How would you solve it?c. 1000 ml d. 100 literse. 900 ml4. What is the percent oxygen in ammonium sulfate?a. 48.8% Problem type(s):b. 24.2 % How would you solve it?c. 28.3%d. 24.6 %5. Which of the following does not describe 44.0 g of propane, C3H8?a. One mole of propane.b. The amount of propane that contains 8.0 g of hydrogen.c. The amount of propane that contains 33.0 x 6.02 x 1023 molecules of propane.d. The amount of propane that contains 8 x 6.02 x 1023 hydrogen atoms.e. The amount of propane that contains 36.0 g of carbon.Problem type(s):How would you solve it?6. What is the name of the following compounds: NH4SCNa. ammonia cyanide Problem type(s):b. ammonium sulfer cyanate How would you solve it?c. ammonium thiocyanated. ammoniated scandatee. ammonium bycyanide7. What is the oxidation number of oxygen in NaO2? (An exception that requires knowing hierarchy of ox # rules).a. -1 Problem type(s):b. -2 How would you solve it?c. -0.5d. +1e. 08. Calculate the number of moles of Fe3O4. produced when 3.6 x 1023 molecules of FeO react with 1.6 grams of O2?6FeO + O2 ---> 2Fe3O4a. 3.0 moles Problem type(s):b. 0.1 moles How would you solve it?c. 1.0 molesd. 0.25 molese. 0.083 moles9. Assuming the following reaction yields 85%, how many moles of Zr(s) would be produced when 0.10 mol of Mg(s) isused?ZrCl4(s) + 2 Mg(s) Zr(s) + 2MgCl(s)a. 0.10 mol Problem type(s):b. 0.0425 mol How would you solve it?c. 0.625 mold. 0.225 mol10. In which compound does the chromium in the chromate ion have an oxidation number of +6?a. CaCrO4Problem type(s):b. CrCl3How would you solve it?c. NaCrO4d. NaCr2O711. How much does an atom of Na weigh?a. 23 grams Problem type(s):b. 1 mole How would you solve it?c. 3.8 x 10-23 gramsd. 2.3 x 10-24 gramse. 2.6 x 1022 grams12. How many atoms of oxygen are in 32 grams of oxygen?a. 1 mole Problem type(s):b. 16 grams How would you solve it?c. 2 atomsd. 12 x 1023 atomse. 6 x 1023
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