Week 1 Notes
Week 1 Notes CHE105
Allen County Community College
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This 3 page Class Notes was uploaded by Hallie Hawkins on Sunday September 25, 2016. The Class Notes belongs to CHE105 at Allen County Community College taught by Dr. Saha in Fall 2016. Since its upload, it has received 25 views. For similar materials see Introduction to Chemistry in Chemistry at Allen County Community College.
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Date Created: 09/25/16
Chapter One Evolution of Chemistry ● The four greeks believed in four basic elements ○ Air ○ Water ○ Fire ○ Earth ● All substances were combinations of these four basic elements The Scientific Method ● Science is the methodical exploration of nature followed by a logical explanation of the observations ● An experiment involves scientists who explore nature according to a planned strategy and make observations under controlled conditions The Scientific Method, Continued ● The scientific method is a systematic investigation of nature and requires proposing an explanation for the results of an experiment in the form of a general principle ● The initial, tentative proposal of a scientific principle is called a hypothesis ● After further investigation, the original hypothesis may be rejected, revised, or elevated to the status of a scientific principle Applying the Scientific Method ● Step 1: Perform a planned experiment, make observations, and record data ● Step 2: Analyze data and propose a tentative hypothesis to explain the experimental observations ● Step 3: Conduct additional experiments to test the hypothesis. If the evidence supports the initial proposal, the hypothesis may become a scientific theory. Applying the Scientific Method, Continued ● After sufficient evidence, a hypothesis becomes a scientific theory ● A natural law states a measurable relationship Modern Chemistry ● Chemistry is a science that studies the composition of matter and its properties ● Chemistry is divided into several branches ○ Organic chemistry is the study of substances containing carbon ○ Inorganic chemistry is the study of all other substances that don’t contain carbon ○ Biochemistry is the study of substances derived from plants and animals ○ Green chemistry is the design of chemical processes that reduce waste and hazardous substances Chemistry Connection: “Worth Your Salt?” ● Salt was once so valuable, it was used to pay Roman soldiers ● Table salt is obtained by three major processes ○ Salt Mining ○ Solution Mining ○ Solar Evaporation of Salt Water ● Table salt is necessary for the human body, but too much can cause high blood pressure Learning Chemistry ● Different people learn chemistry differently Chemistry: The Central Science ● Knowledge of chemistry is important to understanding the world around us Chemistry Connections: A Student Success ● In 1886, pure aluminum metal costs over $100,000 per pound ● Charles Hall and Paul Heroult both independently discovered a method for obtaining pure aluminum ore ● The industrial process for obtaining aluminum metal is referred to as the Hall Heroult process ● Today, pure aluminium costs less than $1 per pound
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