CHAPTER 1, Introduction to Chemistry (continued) SECTION 1.3 THINKING LIKE A SCI

Question

CHAPTER 1, Introduction to Chemistry (continued) SECTION 1.3 THINKING LIKE A SCIENTIST (pages 20-25) This section describes the development ofan experimental approach to chemistry and steps in in the scientific method. It also discusses the role of collaboration and communication in science. Alchemy (page 20) 1. Practical alchemy focused on 2. Alchemists developed processes for separating and purifying An Experimental Approach to Science (page 21) 3. How did Lavoisier help to transform chemistry? 4. Circle the letter of the word that identifies what Lavoisier demonstrated was necessary for materials to burn. a. phlogiston b. nitrogen d. metals The Scientific Method (pages 22-23) 5. What is the scientific method? 6 Guided Reading and Study Workbook

Explanation / Answer

Ans. 1. practical alchemy focused on “developing techniques for working with metal, glass and dyes”.

Ans. 2. Alchemists developed processes for separating mixtures and purifying chemicals.

Ans. 3. The most significant contribution of Lavoisier in transforming chemistry is by “introducing the highly precise measurements (upto 0.0005 gram, approximately) in chemical reactions”. Since measurement in the central theme of tracing chemical transformation, such precise measurements proved useful in measuring various chemical changes. It also led him propose the “Law of mass conservation”, which could not be possible without measuring chemical changes with high precision.

Ans. 4. Phlogiston

Ans. 5. Scientific method-

“principles and procedures for the systematic pursuit of knowledge involving the recognition and formulation of a problem, the collection of data through observation and experiment, and the formulation and testing of hypotheses”.                        Ref: Merriam-Webster

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