Page Points Score Total: 175

Transcription

1 Name: Date: Page Points Score Total: 175 Show all your work. Write in Pen. Check your significant figures and units. Please show all your work. Answers must be circled. Good Luck! Total Time: 110 mins Quantity Relationship Quantity Relationship Length 1 m = yd Temperature 1 C = 1.80 F 1 cm = in 1 K = 1.80 F 1 km = mi Energy 1 cal = BTU Volume 1 L = qt 1 cal = J 1 cm 3 = fl oz. Pressure 1 atm = 760 Torr 1 L = 1000 ml 1 atm = 101,325 Pa N A = amu = g STP: 0 C (273 K) and 1 atm Metals with multiple oxidation states: Cr, Fe, Mn, Co, Mo, Ru, Pd, Sn R = L atm mol 1 K 1 = 62.4 L mmhg mol 1 K 1

2 Multiple Choice (30 pts): Please circle best answer. 1. (2 pts) Which of the following would cause a calcium atom (Ca) to achieve a noble gas configuration? (a) Lose one electron (b) lose two electrons (c) gain one electron (d) two electrons 2. (2 pts) A redox reaction can also be a (a) combination reaction (b) single replacement reactions (c) decomposition reaction (d) more than one response is correct 3. (2 pts) The heat of fusion of water is What are the units associated with this number? (a) cal (b) cal / C (c) cal / g C (d) cal / g 4. (2 pts) In the equation for an endothermic reaction, the word heat appears (a) on the right side (b) on the left side (c) on both sides (d) on neither side 5. (2 pts) The direct change from a solid to the vapor state is called (a) evaporation (b) sublimation (c) boiling (d) fusion 6. (2 pts) The correct name for CsS is (a) cesium sulfate (b) cesium sulfide (c) cerium sulfate (d) cerium sulfide 7. (2 pts) How does the kinetic energy of a particle change if the particles velocity is increased by a factor of 3? (a) kinetic energy increases by a factor of 3 (b) kinetic energy decreases by a factor of 3 (c) kinetic energy increases by a factor of 9 (d) kinetic energy increases by a factor of 2 Page 2 of 9

3 8. (2 pts) Convert the temperature of 45 C into Kelvins (a) -45 K (b) -228 K (c) 228 K (d) 318 K 9. (2 pts) What is the correct formula for the ionic compound containing Al 3+ and the phosphate ion? (a) Al 3 (PO 4 ) 3 (b) AlPO 4 (c) Al 3 (PO 4 ) 2 (d) Al 2 (PO 4 ) (2 pts) The shape of BF 3 is: (a) angular (b) trigonal planar (c) trigonal pyramid (d) tetrahedral 11. (2 pts) What property of a liquid such as mercury is used in a liquid-glass thermometer? (a) density (b) compressibility (c) thermal expansion (d) more then one response is correct 12. (2 pts) The modern definition of oxidation is a process (a) involving a reaction with oxygen (b) in which hydrogen is gained (c) in which electrons are gained (d) none of the above 13. (2 pts) Atoms are considered isoelectronic if (a) they have similar electronic configurations (b) they have different number of electrons 14. (2 pts) Cohesive forces in matter are related to (a) potential energy from the particle repulsions (b) potential energy from the particle attractions (c) kinetic energy (d) more then one response is correct 15. (2 pts) The lattice site in a crystal is (a) the general location of all particles in a crystal (b) the individual location occupied by a particle (c) the rigid three-dimensional arrangement of particles (d) none of the above Page 3 of 9

4 Short Answer (120 pts): Please circle best answer. 16. Aqueous solutions of barium nitrate and ammonium carbonate react in a double replacement reaction. (a) (4 pts) Predict the products and write the balanced equation for the reaction. (b) (5 pts) How many moles of ammonium nitrate will be produced from grams of ammonium carbonate? (c) (5 pts) How many moles of barium nitrate are needed to react with grams of ammonium carbonate? 17. Acetylene gas (C 2 H 2 ) undergoes combustion to produce carbon dioxide and water vapor. (a) (4 pts) How many liters of C 2 H 2 are required to produce 75.0 L of CO 2? (b) (4 pts) What volume of H 2 O is produced? (c) (4 pts) What volume of O 2 is required for this reaction? Page 4 of 9

5 18. Balance the following equations and determine what is being oxidized and what is being reduced: (a) (3 pts) Ca + H 2 O CaO + H 2 (b) (3 pts) Na + Cl 2 NaCl (c) (3 pts) CaO + H 2 O Ca(OH) 2 (d) (3 pts) KClO 3 KCl + O Consider: CH 4 (g) + Cl 2 (g) CCl 4 (l) + HCl (g) (a) (5 pts) If 4.00 g of methane (CH 4 ) reacts with 15.0 g of chlorine (Cl 2 ) what is the limiting reagent? (b) (5 pts) What is the maximum mass of CCl 4 that can be formed? Page 5 of 9

6 20. Ammonia (nitrogen trihydride), carbon dioxide and water vapor react to form ammonium bicarbonate. (a) (2 pts) Write and balance this chemical equation. (b) (13 pts) Suppose 50.0 g of ammonia, 80.0 g of carbon dioxide and 5.00 L of oxygen at STP are reacted. What is the maximum number of grams of ammonium bicarbonate that can be produced? 21. Draw the lewis structure for the following molecules. Determine VSEPR shape and polarity. (a) (3 pts) CCl 4 (b) (3 pts) S 8 (c) (3 pts) CO (d) (3 pts) SCl 6 (e) (3 pts) XeO 2 F 2 (all O s and F s are attached to the central Xe) Page 6 of 9

7 22. (5 pts) At what temperature will a gas be at if you allow it to expand from an original ml at 65.0 C to 3.40 L? 23. (4 pts) What is the volume of 5.01 moles of H 2 at STP? 24. (5 pts) Write the Total Ionic Equation, the Net Ionic equation and state what are spectator ions for the following reaction. Na 2 CO 3 + HCl NaCl + CO 2 + H 2 O Page 7 of 9

8 25. Write the name or the formula for the following compounds. If a covalent compound give the VSEPR shape. (a) (2 pts) Na 2 CO 3 (b) (2 pts) PbO (c) (2 pts) diboron hexahydride (d) (2 pts) Ga(NO 3 ) 2 (e) (2 pts) Be(CH 3 COO) 2 (f) (2 pts) lead (II) sulfite (g) (2 pts) silicon dioxide (h) (2 pts) magnesium acetate (i) (2 pts) copper (I) arsenide (j) (2 pts) ammonium sulfite (k) (2 pts) sulfur hexachloride (l) (2 pts) sodium phosphide (m) (2 pts) P 4 S 5 (n) (2 pts) Si 2 Br 6 Page 8 of 9

9 26. (7 pts) It is not safe to put aerosol canisters in a campfire, because the pressure inside the canister gets very high and can explode. If I have a 1.00 L canister that holds 2 moles of gas, and the campfire temperature is 1400 C, what is the pressure inside the canister (in atm)? 27. (18 pts) Draw the temperature curve for the heating of g water from -40 C to 220 C. Label all the states and determine where the enthalpy of fusion and vaporization are. Then using the following information determine the amount of heat needed to accomplish this process. C p,g = kj kg 1 K 1 C p,s = kj kg 1 K 1 C p,l = kj kg 1 K 1 H fus = kj mol 1 H vap = kj mol 1 Page 9 of 9