The following examination contains 38 questions valued at 3 points/question. Name

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1 Chem 11 Final Exam Practice Winter 018 The following examination contains 38 questions valued at 3 points/question. Name T f = -(1.86 o C/mole)(moles) T b = (0.5 o C/mole)(moles) 1.86/.5 = MW/x % w/v = (g solute/ml solution)100 ph = -log[h + ] poh = -log[oh - ] ph + poh = 14 [A - ]/[AH] = 10 ph pka or log ([A - ]/[AH]) = ph - pk a M A V A = M B V B N = N o (1/) n 1 or I I d d 1 d I I1 d 1. Glucose, or blood sugar, is a non-dissociating sugar of MW = 180 g/mol. What is the freezing point of a solution that contains 50.0 g of glucose dissolved into 1.0 L of water? a o C b. 0.5 o C c o C d. 0.5 o C e. 6.7 o C. Glucose may be used intravenously as a volume expander post significant blood loss or as a means of avoiding a negative energy balance in certain intensive care circumstances. How much glucose would have to be added to 1.0 L of water to make an isotonic solution? a. 1.7 g b. 5.0 g c. 17 g d. 50 g e. 640 g 3. What is the w/v % of an isotonic glucose solution? a % b % c. 1.7 % d. 5.0 % e. 64 % 1

2 4. Maple syrup is considered to be maple syrup when the boiling point of the aqueous mixture reaches o C. Presuming the only component present is sucrose (MW = 34 g/mol) what mass of sucrose must be dissolved in every L of water in order for the solution to be considered maple syrup? That is, what mass is necessary to achieve a T b = 4.0 o C? a. 7.7 g b. 44 g c. 340 g d. 1.4 kg e..6 kg Bonus (3 EC): Is maple syrup hypotonic, isotonic, or hypertonic? a. Hypotonic b. Isotonic c. Hypertonic 5. Which of the following is true of an aqueous basic solution? a. ph > 7 b. There are no H 3 O + ions present c. There are more OH - ions than there are H 3 O + ions d. (a) and (b) are correct e. (a) and (c) are correct 6. What is the ph of a solution in which 3.65 g HCl is dissolved in L H O? Circle the correct answer What is the ph of a solution in which 4.00 g NaOH is dissolved in L H O? Circle the correct answer What is the ph of a solution in which both 3.65 g HCl and 4.00 g NaOH are dissolved in L H O? Circle the correct answer

3 9. Which of the following compounds will lower the ph of water when added? a. HF b. HCl c. HBr d. HI e. All of the above 10. Which of the following compounds will raise the ph of water when added? a. NaF b. NaCl c. NaBr d. NaI e. None of the above 11. Which of the following compounds is not a base? a. NH 3 b. CH 3 CH NH c. (CH 3 CH ) NH d. CH 3 CH NH 3 Cl e. None of the above are bases 1. Which of the following compounds is not an acid? a. CH 3 CO H b. CH 3 CH OH c. H CO 3 d. NaHSO 4 e. N/A; all of the above are acids 13. In the acid-base reaction below, indicate the conjugate base of the acid and the conjugate acid of the base by drawing a line between them and labeling. Label both members of each pair. H 3 PO 4 + Al(OH) 3 AlPO 4 + 3H O

4 14. In the acid-base reaction below, indicate the conjugate base of the acid and the conjugate acid of the base by drawing a line between them and labeling. Label both members of each pair. CH 3 ONa + CH 3 NH 3 Cl CH 3 OH + CH 3 NH + NaCl 15. In the acid-base reaction below, indicate the conjugate base of the acid and the conjugate acid of the base by drawing a line between them and labeling. Label both members of each pair. H SO 4 + NaOH NaHSO 4 + H O 16. Please give the products of the following acid-base reaction as NaHSO 4 + NaOH 17. Please give the products of the following acid-base reaction as Na SO 4 + HCl 18. Please give the products of the following acid-base reaction as CH 3 CO H + NH Please give the products of the following acid-base reaction as Ca(OH) + NH 4 Cl 0. Please give the products of the following acid-base reaction as CaCl + NH 4 Cl

5 1. What is the ratio of sodium acetate (CH 3 CO Na) to acetic acid (CH 3 CO H, pk a = 4.8) necessary to generate a buffer of ph = 7.8? CH 3 CO Na: CH 3 CO H a. 1:1000 b. 1:100 c. 1:10 d. 1:1 e. 10:1 f. 100:1 g. 1000:1. What is the ph of an unknown HCl solution if a 50.0 ml sample requires 5.0 ml of 0.00 mm NaOH to reach the equivalence point? Please show your work. Answer: 3. How many neutrons are in oxygen-18? a. 6 b. 18 c. 16 d. 10 e Which of the following is the nuclear symbol for the beta particle? 4 a. He 0 1 b. e c. 1 1 H d. 0 1e e. 1 0 n

6 5. When a beta particle is emitted from the nucleus of a radionuclide, which of the following is also occurring in the nucleus? a. A proton is being converted into a neutron b. A neutron is being converted into a proton c. An electron is being converted into a proton d. An electron is being converted into a neutron e. Gamma radiation is being converted into an electron 6. Please complete the following nuclear reaction As? + 0 1e? = 7. Please complete the following nuclear reaction As? + 0 1e? = 8. Please complete the following nuclear reaction 14 C 14 N +?? = 9. Please complete the following nuclear reaction 11 C 11 B +?? = 30. Please complete the following nuclear reaction 06? He? = Pb Please complete the following nuclear reaction? He? = Rn 4

7 3. The half-life for mercury-197 is 64.1 hr. If a patient is given 5.0 ng of 197 Hg, how much will remain after 5.34 days? Please show your work. Answer: 33. The half-life for mercury-197 is 64.1 hr. If a patient is given 5.0 ng of 197 Hg, how much will remain after 7 days? Please show your work. Answer: 34. A selenium-75 source produces 300 rem at.0 m. What is the rem value at.0 cm? Please show your work. Answer:

8 35. Below is an image of an individual holding a billet of highly enriched uranium (> 0 % 35 U). In addition to a long t 1/, what type of radioactive decay allows such a daredevil feat? Answer: 36. Which of the following is a measure of radiation dose delivered? a. Curie b. Roentgen c. Rad d. Rem 37. Which of the following is a measure of radiation dose absorbed? a. Curie b. Roentgen c. Rad d. Rem 38. Which of the following is a measure of radiation intensity? a. Curie b. Roentgen c. Rad d. Rem