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COLLEGE OF ENGINEERING

PUTRAJAYA CAMPUS

FINAL EXAMINATION

SEMESTER 2 2008/2009

PROGRAMME : Foundation in Engineering

SUBJECT CODE : CHEF111

SUBJECT : Chemistry Laboratory

DATE : 14 February 2009

TIME : 2.30 pm –3.30 pm (1 hour)

INSTRUCTIONS TO CANDIDATES:

1. There are twenty (20) multiple choice questions in this booklet. Answer all questions.

2. There is only ONE best response to each question. Read all responses, choose the BEST one and circle it on the page. Then, mark the letter corresponding to that response in the answer sheet.

3. No reference books, papers or mobile phones are allowed into the examination hall.

4. A copy of the Periodic Table is given on page 8.

5. Please make sure that you write your name, student ID number, seat number, Lab section and your instructor’s name on the answer sheet.

6. Student should submit ONLY the answer sheet (Page 9).

|TABLE OF CONSTANTS |

|Avogadro's number = 6.022 x 10 23 mol-1 |Gas constant, R = 0.0821 L. atm / K. mol |

|1 atm = 760 mmHg = 760 torr = 101,325 Pa |Gas constant, R = 8.314 J / K. mol |

|1 J = 1 kg. m2 / s2 |Speed of light, c = 3.0 x 108 ms-1 |

|Planck’s constant, h = 6.63 x 10-34J.s | |

|Rydberg constant, RH = 2.18 x 10-18J. | |

THIS QUESTION PAPER CONSISTS OF 9 PRINTED PAGES INCLUDING THIS COVER PAGE.

1. Below are the standard operating procedures in the chemistry laboratory EXCEPT

A. Students should wear sensible clothing which includes comfortable shoes that allow rapid movement in case of emergency.

B. Working bench should be kept clean and tidy to minimize breakage of glassware and spillage of reagents.

C. Experiments that involve organic or inorganic vapors and formation of gaseous products should be conducted in the fume hood.

D. Broken glassware should be disposed of in a special container.

E. If you have taken too much of a reagent, the excess can be returned to the bottle.

2. Which of the following laboratory equipment is/are WRONGLY named?

|[pic] | |[pic] |

|I. Pipette |[pic] | |

| | |III. Erlenmeyer flask |

| |II. Crucible tongs | |

A. I only.

B. II only.

C. III only.

D. I and II only

E. II and III only.

3. ‘Small Scale Chemistry’ is an innovative, low-cost and time-efficient teaching model for laboratory chemistry. Below are the essential features of small scale chemistry EXCEPT

A. small scale chemistry involves scaling down of chemical reagents to volumes and masses smaller than those used in normal laboratory.

B. small scale chemistry uses expensive lab-ware in the form of plastic materials.

C. small scale chemistry manifests the ‘Green Chemistry’ concept which focuses on reducing less waste materials.

D. small scale chemistry promotes ‘student safety’ by using small amounts of chemicals.

E. small scale chemistry is an approach of teaching chemistry using laboratory equipments made from common every day materials such as straws and plastic cups.

4. Which of the following is an example of homogenous mixture?

A. Milk.

B. Chocolate chip cookies.

C. A mixture of sand and sugar.

D. Soil.

E. Chunky peanut butter.

5. Fractional distillation is one of the physical separation methods used to separate mixtures. It

A. is used to separate a solid which has not dissolved in a liquid.

B. uses sieves and screens to separate different size particles.

C. is based on the differences in boiling points of a mixture of liquids.

D. relies on a difference in particle density.

E. involves an instrument that spins very quickly and separates solid from liquid in the mixtures.

6. The density of ethanol is 0.80 g/mL. If 15 drops of ethanol from a medicine dropper weigh 0.60 grams, how many drops does it take from the dropper to dispense 1.0 mL of ethanol?

A. 5 drops

B. 10 drops

C. 15 drops

D. 20 drops

E. 25 drops

7. Which of the following statement is FALSE about precision and accuracy?

A. Accuracy tells us how close a measurement is to the true value of the quantity that was measured.

B. Precision refers to how closely two or more measurements of the same quantity agree with one another.

C. Highly accurate measurements are never precise.

D. Highly precise measurements do not necessarily guarantee accurate results.

E. Using a faulty balance in weighing samples may give precise readings that are in error.

8. The factors that affect the yield of products in a chemical reaction are

A. amounts of starting materials and amount of solvent used.

B. amounts of starting materials and amount of precipitate produced.

C. amount of precipitate produced and volume of gaseous product.

D. amounts of starting materials and percent yield of the reaction.

E. percent yield of the reaction and drying duration.

9. The reaction: 2 KClO3 (s) → 2 KCl (s) + 3 O2 (g) produces 0.834 g of O2 from 5.32 g of KClO3. The theoretical yield of the reaction is

A. 15.7 %

B. 0.834 g

C. 2.08 g

D. 84.3 %

E. 100 %

10. A student carried out an experiment to determine the empirical formula of an insoluble lead compound. The table below shows the summarization of the procedures:

|Test tube# |

|Example: |[pic] |

|1. |[pic] |11. |[pic] |

|2. |[pic] |12. |[pic] |

|3. |[pic] |13. |[pic] |

|4. |[pic] |14. |[pic] |

|5. |[pic] |15. |[pic] |

|6. |[pic] |16. |[pic] |

|7. |[pic] |17. |[pic] |

|8. |[pic] |18. |[pic] |

|9. |[pic] |19. |[pic] |

|10. |[pic] |20. |[pic] |

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SEAT NUMBER:

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