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CHAPTER 1 - CHAPTER 1 I Study of Chemistry a Chemistry 1...

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CHAPTER 1 I. Study of Chemistry a. Chemistry 1. Study of Matter and its properties 2. Study of changes that matter undergoes 3. Study of energy associated with changes in matter b. Matter 1. Anything that has mass and volume 2. Composition of matter-types and amounts of simpler substances, that make up matter c. Scientific method 1. Observations- facts that ideas must explain A. Quantative observation are most useful (Data) B. When some observation is made by many investigators – natural law 2. Hypothesis – A proposal made to explain observations A. Need not be correct, but testable B. If inconsistent with experimental results, it is revised or discarded 3. Experiment- A set of procedual steps that test a hypothesis A. Contains 2 variables B. Results can not be altered C. Results must be reproducible 4. Model – Formulate a conceptual model or theory based on experimental results A. Gradually emerges as the hypothesis is modified to account for experimental results. B. Allows predictions to be made about phenomenon’s II. Classification of matter a. States of matter 1. Solid - Fixed shape that does not conform to its container shape 2. Liquid - Conforms to a container shape and fills the container only to the extent of the liquids volume. 3. Gas - Conforms to its container shape and fills entire container. b. Changes 1. Physical- substance alters its physical form, not its chemical composition 2. Chemical change (Chemical reaction (rxn)) – substance is converted into a different substance or substances.
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