FSG-PPT-060610 (pdf) - DrJJ - UiTM

Outcome Based Education 07/06/2010Example: CCI Item#11What is the reason for your answer to question 10?(a) The weight of water displaced is equal to the weight ofthe ice. (20%)(b) Water is more dense in its solid form (ice) (10%)(c) Water molecules displace more volume than icemolecules. (10%)(d) The water from the ice melting changes the water level.(46%)(e) When ice melts, its molecules expand. (14%)6/7/2010 Copyright DrJJ, ASERG, FSG, UiTM. March 2010 89•Young Researchers CAS 2006, Selangor, 13 th -14 th June, 2006Example(Conservation Question)CCI Item #12Iodine solidA 1.0-gram sample of solid iodine is placed in a tube and the tube issealed after all of the air is removed. The tube and the solid iodinetogether weigh 27.0 grams.The tube is then heated until all of the iodine evaporates and the tube isfilled with iodine gas. Will the weight after heating be(A) less than 26.0 grams (B) 26.0 grams(C) 27.0 grams (D) 28.0 grams(E) more than 28.0 gramsCS; A: 44%. N=1238Sc; C: 32%. N=12386/7/2010 Copyright DrJJ, ASERG, FSG, UiTM. March 2010 90Copyright DR JJ, ASERG, UiTM, Shah Alam 45