Module 7 Unit 1 Assignment A

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Fanshawe College *

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MI-JUN ACE

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Chemistry

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Jan 9, 2024

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MODULE 7 UNIT 1 Assignment Part A Answer the questions. Include references at the end of the assignment. 1. Why do water-soluble substances dissolve in water? (2 marks) a. Describe the dissolution process of table salt, NaCl, using its ions in your answer (2 marks). The general rule in chemistry is “like substances dissolves like substances”. Water is a very polar molecule and these water- soluble substances are polar too, that’s why they are readily dissolve in water. The water molecules surround the sodium and chloride ions and pull then apart when the table salt is added to the water. In other words the water molecules break apart the sodium and chloride ions. 2. Indicate two liquids, not mentioned previously in the module, which do not dissolve in water . 2 marks  Methane - CH 4  Ethylene - C 2 H 4 3. Explain why potassium bromide is very soluble in water, while calcium oxide’s solubility in water is very weak. In your answer, compare their bonds. 3 marks KBr and CaO both consist of ionic bonds but only differ in the number of electrons donated. KBr has only one electron donated by potassium to bromine while CaO has two electrons donated by calcium to oxygen therefore it requires more energy to break the ion-ion bond in CaO then in KBr. This reflects to the weaker solubility of CaO in water than that of KBr in water. 4. Explain why oil dissolves easily in gasoline but not in water. 2 marks Oil is a non-polar molecule and so is gasoline. Back to the concept “like substances dissolve like substances” oil and gasoline are compatible and able to mix together , unlike water which is a polar solvent and unable to dissolve oil. Total: 11 marks. Submission Instructions Submit your assignment using the drop box on the Assignment page for this unit. References: 1

Fanshawe College. (2023) “Module 7 Unit 1 Presentation” retrieved from https://olmoodle.ontariolearn.com/mod/scorm/player.php? a=8784¤torg=articulate_rise&scoid=17778&sesskey=oOC7l9mxpB& display=popup&mode=normal Helmenstine, Anne Marie, Ph.D. (2023, April 5). Examples of Polar and Nonpolar Molecules. Retrieved from https://www.thoughtco.com/examples- of-polar-and-nonpolar-molecules-608516 2

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