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Exam 1 ReviewSupplemental InstructionIowa State UniversityLeader:KiaCourse:CHEM 177Instructor:DuttonDate:9/10/17 Exam 1 – 31 MC questionsChapter 3.1-3.3 Balancing equations(EOC 3.58) Write a balanced chemical equation for each of the following reactionsCarbon dioxide reacts with carbon to form carbon monoxidePotassium reacts with water to give potassium hydroxide and hydrogen gasPhosphorus, P4, burns in air to give diphosphorus pentoxideOctane, C8H18, burns and becomes carbon dioxide and water vaporBalance the following__Fe(s) + __O2(g) → __Fe2O3(s)__KCl(s) → __K(s) + __Cl2(g)__C8H18(g) + __O2(g) → __CO2(g) + __H2O(l)The mole(EOC 3.26) The uranium used for nuclear fuel exists in nature in several minerals. Calculate how many grams of uranium are in 1 mole of the following:Carnotite, K2(UO2)2(VO4)2Uranophane, CaU2Si2O11Autunite, Ca(UO2)2(PO4)2Calculate the followingWhat is the mass, in grams, of 2.50 x 10-3 mol of ammonium phosphate ((NH4)3PO4)?How many moles of chloride ions are in 0.2550 g of aluminum chloride? What is the mass, in grams, of 7.70 x 1020 molecules of caffeine, C8H10N4O2?Chapter 2Average Atomic Mass(EOC 2.122) There are three stable isotopes of magnesium. Their masses are 23.9850, 24.9858, and 25.9826 amu. If the average atomic mass of magnesium is 24.3050 amu and the natural abundance of the lightest isotope is 78.99%, what are the natural abundances of the other two isotopes? Trends in Compound Formation and Naming(EOC 2.124) Write the chemical symbol of each of the following species:A cation with a mass number of 24, an atomic number of 12, and a charge of 2+A member of group 15 that has a charge of 3+, 48 electrons, and 70 neutronsA noble gas atom with 48 electronsFill in the following tableSymbol112CdProtons3892Neutrons5849Electrons3836Mass no.81235(EOC 2.84) Evaporation of seawater gives a mixture of ionic compounds containing sodium combined with chloride, sulfate, carbonate, bicarbonate, bromide, fluoride, and tetrahydroborate, B(OH)4-. Write the chemical formulas of all the compounds.Label the following groups on the periodic tableTransition metalsHalogensAlkali metalsNoble gasesAlkaline earth metalsMetalloids Chapter 1Give examples of the followingIntensive propertyExtensive propertyHeterogeneous mixtureHomogeneous mixturePure substance(EOC 1.85) A person has a fever of 102.5 deg F. What is this temperature in deg. C? What about in Kelvin? Determine whether the following is a physical or chemical processRusting metal canBoiling a cup of waterPulverizing (crushing) aspirinDigesting a candy barExploding nitroglycerin Solve the following dimensional analysis questionsAn individual suffering from a high cholesterol level in her blood has 242 mg of cholesterol per 100 mL of blood. If the total blood volume of the individual is 5.2 L, how many grams of total blood cholesterol does the individual’s body contain? In March 1989 the Exxon Valdez ran aground and spilled 240,000 barrels of crude petroleum off the coast of Alaska. One barrel of petroleum is equal to 42 gal. How many liters of petroleum were spilled? (1 gal = 3.79 L)Automobile batteries contain sulfuric acid, which is commonly referred to as “battery acid.” Calculate the number of grams of sulfuric acid in 1.00 gal of battery acid if the solution has a density of 1.28 g/mL and is 38.1% sulfuric acid by mass.Naming PracticeName the following compounds or give the chemical formulaSF6B2O3NF3NOLiFCaBr2K2SFeSXenon trioxideMagnesium oxidePhosphorus pentafluorideBoron trichloride Manganese (II) oxideCobalt (III) iodideAmmonium Sulfur dichloride Challenge Questions – If you want an extra challenge try these! CHALLENGE PROBLEMSA compound whose empirical formula is XF3 consists of 65% F by mass. What is the atomic mass of X? Rubidium has two naturally occurring isotopes, 85Rb (relative mass 84.9118 amu) and 87Rb (relative mass 86.9092 amu). If rubidium has an average atomic mass of 85.47 amu, what is the abundance of each isotope (in percent)?The length and width of a box, respectively, 18 cm and 15 cm. If the box holds 6.0 kg of water, what is the height of the box? (water density = 1.0 g/ml)Gold can be hammered into extremely thin sheets called gold leaf. An architect wants to cover a 100 ft x 82 ft ceiling with gold leaf that is five-millionths of an inch thick. The density of gold is 19.32 g/cm^3, gold costs $1654 per troy ounce (1 tory ounce = 31.1034768 g). How much will it cost the architect to buy the necessary gold? ................
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