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Understanding Chemical Reactions in Matter: Physical and Chemical Changes

Explore the differences between physical changes, where no new substances are formed, and chemical changes, where new substances are produced. Learn about reactants and products, types of chemical reactions, the formation of salts, and the Law of Conservation of Matter.

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Understanding Chemical Reactions in Matter: Physical and Chemical Changes

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  1. Lesson 1-5 What Are Chemical Reactions?

  2. I. Changes in Matter A. Physical Changes 1. Changes where no new substances are formed 2. All changes are changes in state a. solid -> liquid b. liquid -> gas c. gas -> liquid 3. Appearance changes (size, shape, or volume)

  3. B. Chemical Changes (reactions) 1. One or more new substance is produced 2. Indicators of chemical reactions: a. light b. bubbles (gas) c. temp change (hot/cold) d. color change e. appearance of a solid

  4. II. Chemical Reactions A. Substances change into other substances. B. Reactants = The substances used in a reaction. What you start out with. 1. Ex. Sodium + Chlorine C. Products = The substances you get out of a reaction. What you end up with. 1. Ex. Water + Sodium + Chlorine = Sodium Chloride & Energy (light & heat)

  5. D. Types of Chemical Reactions 1) Compounds break apart 2) Elements combine to make a compound a) Long chains of molecules form (paper clips linked) E. Salts 1) Form when an acid and a base react a) Ex. Table Salt – NaCl Sodium & Chlorine

  6. Law of Conservation of Matter A. New substances formed in chemical changes are not new matter 1. atoms are same, but in a different arrangement B. Law of Conservation of Matter states that matter is not created, nor is it destroyed 1. mass stays the same

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