ࡱ> lnk~ Cbjbj :||4    dn jooo$h-oooooCoo} Na]NP܃Y0؀H   oooooooUjooooooo ooooooooo| : Homework #1 Chemistry is used in many professions. Suggest two ways persons practicing each of the following professions might make use of chemistry. Physician Lawyer Photographer List three different study methods you will use to succeed in chemistry. Which of the following statements could be tested scientifically? (T) testable (N) not testable Most of the Suns energy is in the form of visible light.Unicorns exist.Shelly wrote beautiful poetry.Diamond is harder than steel.Chose one statement that could be tested and explain the experiment you propose to test it. Categorize each of the following examples as basic research (B)or applied research (A). The discovery of a new galaxy.The development of better methods to make rubber tires.The breeding of a new variety of disease-resistant chicken.A study of the diet of parrots in a tropical rein forest.The identification of a new chemical element Homework #2 Write the following numbers in scientific notation 0.0000820.000000000142028419200000 Tell the number of significant figures in each of the following numbers 0.025 m40.0 g0.085 L129.50 g0.003820 nm190.0032 mL Perform the following calculations and report the answer to the correct number of significant figures.  EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3   EMBED Equation.3  What is the metric unit for length? What is the metric unit for mass? What is the metric prefix for 1000 units? What is the metric prefix for 1/1000000th of a unit? Name the following compounds MgBr2 KCl Ag2O Al2S3 Write the formula for the following compounds Barium sulfide Calcium nitride Zinc iodide Homework #3 (Show complete set-up for all problems, use proper significant figures.) How many kilograms does a 186 lb man weigh? How many liters of gasoline will be used to drive 525 miles in a car that averages 35 mi/gal? A bag of pretzels has a mass of 279.2 grams and costs $1.69. If a bag contains 20 pretzels, what is the cost of a pound of pretzels? An aquarium measures 16 in X 8 in X 10 in. How many liters of water does it hold? Write the formula for the following cations Manganese (II) ion Cupric ion Cadmium ion Homework # 4(Show complete set-up for all problems, use proper significant figures.) Calculate the density of a liquid if 50.00 mL of the liquid has a mass of 78.26 g. What mass of mercury (density = 13.6 g/mL) will occupy a volume of 25.0 mL? The volume of blood plasma in adults is 3.1 L. Its density is 1.03 g/mL. Approximately how many pounds of blood plasma are there in your body? The Sacagawea gold-colored dollar coin has a mass of 8.1 g and contains 3.5% manganese. What is its mass in ounces (1 lb = 16 oz) and how many ounces of Mn are in this coin? A temperature of 105oC is required to fry an egg. What is this temperature in oF and K? Homework #5(Show complete set-up for all problems, use proper significant figures.) Distinguish between an element and a compound. Classify each of the following as being primarily a physical or primarily a chemical change. Formation of a snowflake Boiling water Boiling an egg Dissolving sugar in water A leaf turning yellow 18 g of oxygen is reacted with sufficient nitrogen to make 56 g of nitrogen dioxide according to the following reaction: 2 O2(g) + N2(g) ( 2 NO2(g) If the reaction goes to completion, how much nitrogen reacted? The specific heat of zinc is 0.096 cal/goC. Determine the energy required in Joules (4.184 J = 1 cal) to raise the temperature of 250.0 g of zinc from room temperature (24.0oC) to 150.0oC. Homework # 6 (Show complete set-up for all problems, use proper significant figures.) Explain why, in Ruthorfords experiments, some alpha particles were scattered at large angles by the gold foil or even bounced back. What is the nuclear composition of the six naturally occurring isotopes of calcium having mass numbers of 40, 42, 43, 44, 46, and 48? Write the isotopic notation symbols for each isotope. Naturally occurring lead exists as four stable isotopes: 204Pb with a mass of 203.973 amu (1.480%); 206Pb, 205.974 amu (23.60%); 207Pb, 206.9759amu (22.60%; and 208Pb, 207.9766 amu (52.30%). Calculate the average atomic mass of lead. An aluminum atom has an average diameter of about 3.0 x 10-8 cm. The nucleus has a diameter of about 2.0 x 10-13 cm. Calculate the ratio of the atomic volume to nuclear volume for an atom of aluminum. Assume that an atom is spherical (V = (4/3)pr3) Homework # 7 (Show complete set-up for all problems, use proper significant figures.) Calculate the percent of each element present in a sample of magnesium oxalate. Give the correct IUPAC name for each of the following compounds Na2S AgIO3 SrSO3 Sr3(AsO3)2 FePO3 OF2 HNO2 Hg(OH)2 Write the correct formula for each of the following compounds Beryllium phosphide rubidium nitrate calcium sulfate copper(I) carbonate cobalt(II) perchlorate pentahydrate ammonia hydrosulfuric acid zinc permanganate Homework #8 (Show complete set-up for all problems, use proper significant figures.) Exactly one mole of carbon disulfide contains How many moles of carbon? How many moles of sulfur? How many carbon disulfide molecules? How many carbon atoms? How many sulfur atoms? How many atoms of all kinds? How many moles of atoms are contained in 382 g of cobalt? How many atoms of chlorine are contained in 297 g of carbon tetrachloride? How many grams will 2.96 x 1025 atoms of gold weigh? What is the mass of one atom of platinum? What is the mass of manganese in a sample of MnO2 containing 2.86 x 1024 atoms of oxygen? Homework #9 Calculate the empirical formula for adenosine triphosphate (ATP) composed of 23.68% C, 3.18% H, 13.81% N, 18.32% P, and 41.00% O. Vanillin, a flavoring agent, is composed of 63.2% C, 5.26% H, 31.6% O and has a molar mass of 150 g/mol. Determine the empirical and molecular formulas for vanillin. Homework #10 List three chemical changes that indicate a chemical reaction has occurred. Balance the following chemical equations Na + O2 ( Na2O C2H4 + O2 ( CO2 + H2O Fe + H2O ( Fe2O3 + H2 ZnS + O2 ( ZnO + SO2 N2 + H2 ( NH3 FeCrO4 + C ( Cr + Fe + CO Write and balance a chemical equation describing the following reactions: Aluminum metal is reacted with liquid bromine to form a precipitate of aluminum bromide. Powdered tetraiodine nonoxide is heated and it decomposed to form solid diiodine hexoxide, crystallized iodine, and oxygen gas. Homework #11 Balance the following molecular equations and write the corresponding total and net ionic equations. HCl (aq) + AgNO3(aq) ( AgCl(s) + HNO3(aq) (NH4)2SO4(aq) + NaOH(aq) ( NH3(g) + H2O(l) + Na2SO4(aq) Ca(NO3)2(aq) + KCl(aq) ( CaCl2(aq) + KNO3(aq) Predict the products of the following reactions and write balanced equations corresponding to the overall reaction, the total ionic equation, and the net ionic equation. HCl(aq) + RbOH(aq) ( H3PO4(aq) + CuSO4(aq) ( (NH4)2S(aq) + CoCl2(aq) ( Homework #12 Complete and balance the following single replacement reactions: Cu(s) + AgNO3(aq) ( Zn(s) + HCl(aq) ( Sn(s) + CuSO4 ( Write an balanced chemical equation for each of the following types of reaction: Redox combustion Double displacement Redox single replacement Acid base Combination decomposition Homework #13 Propane undergoes combustion in air according to the following balanced equation C3H8(g) + 5 O2(g) ( 3 CO2(g) + 4 H2O(g) How many molecules of CO2 will be formed when 25 molecules of C3H8 react? How many moles of oxygen are needed to react with 12.5 mol of C3H8? How many grams of C3H8 react with 500.0 grams of oxygen? If a cylinder of propane contains 1.00 kg of C3H8, how many grams of CO2 are formed when it burns? How many moles of oxygen gas are required to form 5.25 x 1024 molecules of CO2? If 15.0 g of C3H8 are burned in excess oxygen gas, how many molecules of water will be formed? Homework #14 Nitrogen dioxide can form nitric acid by reacting with water as shown by the following balanced reaction 3 NO2 + H2O ( 2 HNO3 + NO If 125.0 g of NO2 and 95.0 g of water react, how many grams of HNO3 can be formed? What reactant is in excess and how many grams of this reactant remain after the reaction? A small amount of silver metal is dispersed in a porous ceramic material. The sample of silver and ceramic has a mass of 871.6 grams. When the sample is treated with concentrated nitric acid, the silver will dissolve but the ceramic is inert. The balanced equation for the reaction is 3 Ag(s) + 4 HNO3(aq) ( 3 AgNO3(aq) + NO(g) + 2 H2O(l) If 327.2 mL of the nitric acid was required to just dissolve the silver, how many grams of silver were in the ceramic and what was the percent of silver in the original sample? The acid solution is 40.0% by weight HNO3 and the density is 1.249 g/mL. Homework #15 Give a brief description of the Bohr model of the atom. What is the maximum number of electrons that can be contained in the following: Any electron orbital An s sublevel A p sublevel A d sublevel An f orbital Explain what is meant by the quantized energy of electrons. What is a quantum jump? Homework #16 Write the complete and shorthand electronic configuration for the following atoms and ions H N S Fe W Al+3 Br-1 How do the radii of the elements change as you go across the periodic table to the right? Explain the reason for this trend. How do the ionization energies of the elements change as you go down a column? Explain the reason for this trend. Homework #17 Draw Lewis Electron Dot Structures for the following atoms, compounds, and ions: P F2 HClO2 (2 O bonded to a central Cl; H bonded to one O) C2H4 OH-1 NH4+1 CO3-2 Homework #18 Write Lewis Electron Dot structures for the following molecules and predict the shape of the compounds. Sketch each of the molecular shapes. The central atom in each molecule is underlined. CCl4 PBr3 H2S CH2O OF2 Homework #19 Define pressure. What is the difference between pressure and force? Perform the following pressure conversions 1147 torr to atm 0.979 atm to torr A gas in a flexible container occupies 475 mL at 32oC and 1.35 at, If the temperature is constant, what volume does the gas occupy when the pressure is 1.70 atm? A gas in a rigid container occupies 300 mL at 38oC ad 1.01 atm. What is the pressure when the Celsius temperature is doubled? A gas is in a flexible container occupies 835 mL at 19oC and 0.998 atm. What is the volume when the temperature is 90oC and the pressure is 0.750 atm? The Goodyear Blimp holds 5.91 x 106 L of He at 27oC and 763 torr. What is the mass of He in the blimp? Homework #20 A 0.852 g sample of a liquid is vaporized. The vapor is found to occupy 153 mL at 110oC and 760 torr pressure. Calculate the molar mass of this chemical. When an oxyacetylene torch burns, oxygen and acetylene react 5 O2(g) + 2 C2H2(g) ( 4 CO2(g) + 2 H2O(g) How many liters of C2H2 at STP are needed to produce 80.0 mL of CO2 at 500oC and 1.10 atm? How many grams of O2 are required to react with 10.0 L of acetylene at 0.989 atm and 20oC? Given that one mole of any gas occupies 22.4 L at 0oC and one atmosphere pressure, what volume of CO2 gas could be produced at the indicated conditions if a solid cube of graphite with a volume of 1.000 m3 was burned in O2 to produce CO2? The density of graphite is 2.25 g/mL. Homework #21 What is vapor? Doctors sometimes spray ethyl chloride on the skin to momentarily freeze it for minor operations. Explain how this works considering that ethyl chloride is a very volatile liquid with a relatively low boiling point. Sketch two water molecules and show what portions of the molecules can attract when they are in close proximity. Classify each of the following diatomic molecules/ions as polar or nonpolar. HF Cl2 CN-1 Does the nature of intermolecular forces change when a substance goes from a solid to a liquid, of from a liquid to a gas? What causes a substance to undergo a phase change? Homework #22 A bottle on the laboratory shelf is labeled saturated NaCl The Bottle contains a clear solution on top of some white crystals. Describe the nature of the solution in terms of dissolving, recrystallization, and dynamic equilibrium. A sample of wine vinegar is found to contain 15.8 grams of acetic acid in 316 mL calculate the molarity of acetic acid in the vinegar. How many mL of a 1.28 M glucose solution are need to provide 7.75 x10-2 mol of glucose (C6H12O6). How many mL of 15.0 M NH3 are needed to prepare 200 mL of a 0.265 M solution by dilution? Homework #23 How many mL of 3.00 M HCl will be needed to dissolve 25.0 grams of aluminum metal according to the reaction 2 Al(s) + 6 HCl(aq) ( 3 H2(g) + 2 AlCl3(aq) Two solutions were mixed in a 400 mL beaker. The first solution was 25.0 mL of 0.174 M FeCl3 and the second was 62.8 mL of 0.123 M NaOH. Calculate the molarities of all ions in the resulting solution and the mass of any precipitate produced. If no precipitate forms, so state. FeCl3(aq) + NaOH(aq) ( Phosphoric acid is made commercially by reacting sulfuric acid with phosphate rock which contains Ca3(PO4)2. the reaction equation is: 3 H2SO4(aq) + Ca3(PO4)2(s) ( 2 H3PO4 + 3 CaSO4 How many liters of sulfuric acid solution are needed to react with 10.0 kg of phosphate rock given that the phosphate rock is 87.4% calcium phosphate. The acid solution is 28.0% H2SO4 and its density is 1.203 g/mL. You should assume that the other material in the rock is inert to the acid. Homework #24 Fill in the table below [H3O+1][OH-1]pHpOH8.274 x 10-4 M3.187 x 10-9 M1.27894.2781 Calculate the pH of a 4.293 x 10-3 M solution of Ba(OH)2. A sample of sodium hydrogen sulfate (NaHSO4) is dissolved in water and titrated with a sodium hydroxide solution. If 14.54 mL of 0.8137 M sodium hydroxide was required to titrate the sample calculate the mass in grams of sodium hydrogen sulfate in the sample. 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