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NAMING COMPOUNDS (COVALENT/IONIC) Covalent:

(prefix)root of Second Element(-ide) Example: CO

Dicarbon Hexafluoride Ionic: Name of Metal

If a group 1 or 2 metal, no parentheses) Name of

2 NAMING COMPOUNDS (COVALENT/IONIC) Covalent: (prefix except Mono-) Name of first element + (prefix)root of Second Element(-ide) Example: CO 2 : Carbon Dioxide CO: Carbon Monoxide C 2F 6: Dicarbon Hexafluoride Ionic: Name of Metal (Oxidation number of metal. If a group 1 or 2 metal, no parentheses) Name of nonmetal+ -ide (If the nonmetal is a polyatomic ion, just write its name) Naming Oxyacids

4 CHM2040A Final Exam Review Session Leader: Ali Younis 1) Which of the following is a hypothesis? A. How does the combination of Fe and C affect the strength of metals? B. Hypoxia in seawater is caused by agricultural runoff. C. The sky is blue. D. Bubbles form on the surface of water when it is heated. 2) Which of the following is a pure substance? A. Coffee B. Soda C. Ice D. Seawater E. Gasoline 3) Classify each substance as a pure substance or a mixture; then element/compound and homogeneous/heterogeneous. A. Wine B. Beef stew C. Iron D. Carbon dioxide 4) Indicate if physical or chemical change and physical or chemical property. A. Evaporation of rubbing alcohol B. Burning of oil C. Bleaching of hair with hydrogen peroxide D. Frost formation on a cold night

5) Suppose three students are asked to determine the mass of an object whose known mass is 10.00 g. Describe each data set in terms of precision/accuracy.

5 5) Suppose three students are asked to determine the mass of an object whose known mass is g. Describe each data set in terms of precision/accuracy. 6) Ammonia (NH3) has a nitrogen-to-hydrogen mass ratio of 4.7:1. When a sample of ammonia is decomposed into its elements it produces 1.9 g of hydrogen. How much nitrogen is produced? a. 1.9 g b. 8.9 g c g d g 7) How many protons, electrons, and neutrons are present in an atom of Cr (Chromium)? A. 52, 52, 24 B. 24, 28, 24 C. 24, 24, 28 D. 28, 24, 52 E. 24, 24, 52 7) Magnesium (Mg) has three naturally occurring isotopes with masses of amu, amu, and amu and natural abundances of 78.99%, 10.00%, and 11.01%, respectively. Calculate the atomic mass of magnesium.

6 8) Determine the number of protons and number of electrons in each ion. Ni 2+ S 2- Br - Cr 3+ 9) Which ion is typically formed by Br? A. Br + B. Br 2+ C. Br 3+ D. Br E. Br 2-10) In which set does all species have the same number of electrons? A. F, Ne, Mg2+ B. Ge, Se2-, Br C. K+, Rb+, Cs+ D. Br, Br, Br+ 11) Calculate the number of copper atoms in 2.45 mol copper 12) How many copper atoms are in a copper penny with a mass of 3.10 g? (Assume that the penny is composed of pure copper.)

13) Calculate the mass (in grams) of 1.1 x 10 23 gold atoms.

C2H3O2 14) A cylinder of pure Copper with a radius of 5 cm contains 2.00 x 10 13 atoms.

7 13) Calculate the mass (in grams) of 1.1 x gold atoms. 14) What is the empirical formula for ethylene glycol? A. C2H6O2 B. C6H2O2 C. CH3O D. C2H3O2 14) A cylinder of pure Copper with a radius of 5 cm contains 2.00 x atoms. Given that the density of Copper is 8.96 g/cm 3, what is the height of the cylinder? 15) Name the compound PbCl4 A. lead(iv) chlorine B. lead(iv) chloride C. lead(ii) chlorine D. lead(ii) chloride

8 16) Name the following compounds: NaNO2 FeSO4 HBr H2SO4 HNO2 17) Name the compound N2O5 A. dinitrogen oxide B. dinitrogen pentoxide C. dinitrogen pentaoxide D. dinitrogen hexoxide

9 18) What mass of HCl (g) is neutralized by 3.26 g Mg(OH)2? Mg(OH)2 = g/mol HCl = g/mol A g HCl B g HCl C x 10 3 g HCl D x 10-3 g HCl Mg(OH)2(aq) + 2HCl(aq) 2H2O(l) + MgCl2(aq) 19) A reaction mixture contains 42.5 g Mg and 33.8 g O2. Determine the limiting reactant and theoretical yield. 2 Mg(s) + O2(g) 2 MgO(s) 20) What volume (L) of a M KCl solution will completely react with L of a M Pb(NO3)2 solution? 2 KCl(aq) + Pb(NO3)2(aq) PbCl2(s) + 2 KNO3(aq)

10 21) What volume of a 6.00 M NaNO3 solution should you use to make L of a 1.20 M NaNO3 solution? 22) Write an equation for the precipitation reaction that occurs (if any) when solutions of potassium carbonate and nickel(ii) chloride are mixed. Then write out the complete ionic equation followed by the net ionic equation. 22) a. For the balanced equation shown below, if the reaction of 40.8 grams of C6H6O3 produces a 39.0% yield, how many grams of H2O would be produced? C6H6O3 + 6O2 6CO2+3H2O

11 23) What volume (ml) of M NaOH is needed to titrate ml of M HBr to the equivalence point? HBr(aq) + NaOH(aq) H2O(l) + NaBr(aq) 24) Identify the oxidizing and reducing agents in the following reaction: Mg(s) + 2 H2O(l) Mg(OH)2(aq) + H2(g) 25) Suppose that a person eats 2387 Calories per day. Convert this amount of energy into each unit: J: kj: kwh: 26)Balance the following chemical skeletons: Au2S3 + H2 Au + H2S As + NaOH Na3AsO3 + H2

27) A cylinder and piston assembly (the system) is warmed by an external flame. The contents of the cylinder expand, doing work on the surroundings by pushing the piston outward.

12 27) A cylinder and piston assembly (the system) is warmed by an external flame. The contents of the cylinder expand, doing work on the surroundings by pushing the piston outward. If the system absorbs 559 J of heat and does 488 J of work during the expansion, what is the value of ΔE? A. 71 J B. +71 J C J D J 28) Determine whether a shiny gold rock is actually gold given the following parameters. q = 57.2 J Ti = 25 C Tf = 57 C m rock = 4.7 g 29) Using the table above answer the following: A 32.5 g cube of aluminum initially at 45.8 C is submerged into g of water at 15.4 C. What is the final temperature of both substances at thermal equilibrium? (assume the Al and water are thermally isolated from everything else.)

13 30) A cylinder equipped with a piston expands against an external pressure of 1.58 atm. If the initial volume is L and the final volume is L, how much work (J) is done? 31) Identify each process as endothermic or exothermic and indicate the sign of ΔH. wood burning in a fire ice cube melting water freezing in a freezer wood burning 32) A propane gas tank in a home BBQ contains 13.2 kg of propane (C3H8). Calculate the heat (in kj) associated with complete combustion of all of the propane in the tank. C3H8(g) + 5 O2(g) 3 CO2(g) + 4 H2O(g) ΔHrxn = 2044 kj

33) Calculate the unknown heat of reaction 34) Use standard enthalpies of formation to determine ΔHrxn for the reaction: 2 Al(s) + Fe2O3(s) Al2O3(s) + 2 Fe(s) 35) When 1.

14 33) Calculate the unknown heat of reaction 34) Use standard enthalpies of formation to determine ΔHrxn for the reaction: 2 Al(s) + Fe2O3(s) Al2O3(s) + 2 Fe(s) 35) When g of liquid hexane (C6H14) undergoes combustion in a bomb calorimeter, the T rises from C to C. Find ΔErxn for the reaction in kj/mol. The heat capacity of the bomb calorimeter is 5.73 kj/ C. The formula mass of hexane is 86.2 g/mol A: kj/mol

15 36) Rubies and sapphires are gemstones where their crystal structure is mostly comprised of aluminum oxide, Al2O3. Find the mass % of aluminum and oxygen. Which element makes up most of the mass of the molecule? 37) A compound was analyzed and found to contain 13.5 g Ca, 10.8 g O, and g H. What is the empirical formula of the compound? 38) NutraSweet is 57.14% C, 6.16% H, 9.52% N, and 27.18% O. Calculate the empirical formula of NutraSweet and find the molecular formula. (The molar mass of NutraSweet is g/mol) 39) A cylinder and piston assembly (the system) is warmed by an external flame. The contents of the cylinder expand, doing work on the surroundings by pushing the piston outward. If the system absorbs 559 J of heat and does 488 J of work during the expansion, what is the value of ΔE? 71J

16 40) A cylinder equipped with a piston expands against an external pressure of 1.58 atm. If the initial volume is L and the final volume is L, how much work (J) is done? (Hint: Recall conversion from L x atm to J)

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CHM 2040 IA Final Review Spring 2018

CHM 2040 IA Final Review Spring 2018 Disclaimer: This guide should be utilized as a supplement to your studying and not entirely relied upon for your success. You are ultimately responsible for all the