Phase changes of water - Oakland Schools

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2. Add and dissolve a small pile of NaCl into the distilled water. Test for conductivity. Record your result. 3. Empty and wash out your beaker and add about 50mL distilled water. 4. Add and dissolve a small pile of sugar into the distilled water. Test for conductivity. Record your result. Results Part C: Conductivity Test Substance Distilled Water NaCl + Distilled Water Sugar + Distilled Water Conductivity (good, poor, none, etc) 26
Analysis 1. Structure analysis: a) What is the difference in structure between ionic and covalent bonds? Draw an atomic diagram (one that shows individual atoms) of both NaCl and sugar to help demonstrate the difference. b) Say you had tapped on the salt with a hammer until it broke. What would the broken pieces have looked like under the microscope? How do you know? c) Say you had tapped on the sugar with a hammer until it broke. What would the broken pieces have looked like under the microscope? How do you know? 2. Melting Point analysis: a) How does the melting point for covalent molecules and ionic compounds differ? b) Why are their melting points different? c) What does this mean in terms of their bond strength? 3. Conductivity analysis: a) Do ionic compounds conduct electricity? b) Why do you think this is the case? c) Do covalent molecules conduct electricity? d) Why do you think this is the case? e) When dissolving a substance in a liquid, chemists follow the rule that “like dissolves like”—this means that covalent compounds will dissolve in covalent liquids and ionic compounds will dissolve in ionic liquids. Based on this rule and your observations, is vegetable oil a covalent or ionic liquid? 4. Create a table with the overall properties of ionic compounds and covalent molecules including their crystal structure, melting point, conductivity, and bond strength. Feel free to add anything else! 5. a) Which has the stronger bond: CaO or H 2 O? Why? b) Which conducts electricity in water: glucose (C 6 H 12 O 6 ) or NaBr? Why? c) Which has a higher melting point: NH 3 or FeCl 2 ? Why? 27
Page 1 and 2: Oakland Schools Chemistry Resource
Page 3 and 4: Instructional Background Informatio
Page 5 and 6: Conduction If you have ever left a
Page 7 and 8: Properties of Solids • Solids can
Page 9 and 10: Kinetic Molecular Theory Terms and
Page 11 and 12: KINETIC MOLECULAR THEORY Activity #
Page 13 and 14: Conduction http://youtube.com/watch
Page 15 and 16: Procedure: 1. Wash your hands. 2. O
Page 17 and 18: Assessment Ideas: Have students des
Page 19 and 20: Source: Chemistry: Chapter 16--Home
Page 21 and 22: KINETIC MOLECULAR THEORY Activity #
Page 23 and 24: Assessment: Have students pair and
Page 25: Pre-Lab 1. What are two major diffe
Page 29 and 30: Content Statements C4.3x - Solids P
Page 31 and 32: Types of Phase Changes Start from:
Page 33 and 34: Phase Changes Terms and Concepts So
Page 35 and 36: Phase Changes Activity #1--Phase ch
Page 37 and 38: Observations: 1. Describe the tempe
Page 39 and 40: Procedure: Hand warmers can be pass
Page 41 and 42: Phase Changes Activity #4--Phase Ch
Page 43 and 44: Phase Changes Activity #5-Everyday
Page 45: Think Critically: Analyze each of t

Phase changes of water - Oakland Schools

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