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Fig. 9.3

Investigating Matter. Fig. 9.3. Chapter 11. Homework Assignment Chap 11. Review Questions (p 237): 3 – 20 Multiple Choice Questions: 1 - 8. Fig 11.5 The three phases of water. gas. Macro scopic view. solid. Micro scopic view. liquid. Change of Phase. Sublimation. Evaporation.

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Fig. 9.3

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  1. Investigating Matter Fig. 9.3 Chapter 11

  2. Homework AssignmentChap 11 Review Questions (p 237): 3 – 20 Multiple Choice Questions: 1 - 8

  3. Fig 11.5 The three phases of water gas Macroscopic view solid Microscopic view liquid

  4. Change of Phase Sublimation Evaporation Deposition Condensation Melting Freezing • All phase changes require addition or removal of heat • e.g., the heat of vaporization of H2O is 2256 J/g

  5. Physical and Chemical Properties Physical property– describes the look or feel of a substance • Phase, color, texture, odor • Melting point, boiling point • Density Chemical property– describes how a substance reacts with another substance • flammability of methane gas • rusting of iron • reaction between vinegar and baking soda

  6. sugar dissolving in water ice melting hydrogen burns in air to form water Physical or Chemical? Physical change - does not alter the composition or identity of a substance. Chemical change - alters the composition or identity of the substance(s) involved.

  7. reactants products A process in which one or more substances is changed into one or more new substances is a chemical reaction Hydrogen reacts with oxygen to form water Chemical bonds are broken in the reactants Chemical bonds are formed in the products

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