Intro Today Chem Unit 1 Notes
Intro Today Chem Unit 1 Notes chm 2023
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This 2 page Class Notes was uploaded by Alicia Doan on Thursday August 25, 2016. The Class Notes belongs to chm 2023 at University of South Florida taught by Dr. Daniel Cruz-Ramírez de Arellano in Summer 2015. Since its upload, it has received 4 views. For similar materials see Chemistry for Today in Chemistry at University of South Florida.
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Date Created: 08/25/16
Unit 1: Chemistry in our Lives 1.1 Chemistry and Chemicals Chemistry is the study of the composition. Structure, properties, and reaction of matter A chemical is a substance that always has the same composition and properties wherever it is found Chemicals are used and happen everyday whether you know it or not. (soaps, toothpaste, when you eat, usage of vehicles, ect) There are several branches of chemistry: General chem, Organic chem, Biological chem, Geochemistry, and Physical chem 1.2 Scientific Method: Thinking like a scientist The scientific method is a process that scientists use to make observations in nature, gather data, and to explain natural phenomena 1) Observations - facts obtained by obvs & measuring 2) Hypothesis – statement that explains the obvs 3) Experiments – procedures that test the hypo 4) Theory – a conclusion that is made after multiple experimentations, which use scientific evidences to support/explain the result. However, theories can always be refuted and aren’t absolute 1.3 Learning Chemistry: A study Plan To best understand this course active learning is needed: (1) Read Learning goals for an overview (2) Form a question from the title section youre about to read (3) READ the textbook and look for answers to your question (4) Self-test yourself w problem questions 1.4 Key math skills for Chem All numbers have a place value: hundreds, tens, ones, tens, tenths, hundredths, and thousandths EX: 5629.813 5 – Thousands 6 – Hundreds 2 - Tens 9 – Ones 8 – Tenths 1 – Hundredths 3 - Thousandths When you multiply or divide, if one number is negative (-) and another is positive (+) then the answer will always be negative (-) EX: [ -2 x 6 = -12 ] or [ 14/ (-2) = -7] When you multiply or divide, if both of the numbers are negative (-) then the answer will always be positive (+) EX: [ -2 x -6 = 12] or [-14/(-2)= 7] 1.5 Writing numbers in Scientific Notation Scientific Notation (sci not) has two parts, a coefficient and a power of 10 When using sci not. You always try to convert the number into a number smaller than 10. To figure out the power just move the decimal to the right or left (depending on what the num is) and how many times you need to move it to make a smaller number than 10 is the power number. When you move the decimal to the left the power is negative thus right is positive. EX: 2400 = 2.4 x 10^3 (moved to left to make smaller than 10, so pos) EX: 5780 = 5.78 x 10^3 (moved to left to make smaller than 10, so pos) EX: 0.00089 = 8.9 x 10^ -4 (moved to right to make smaller than 10, so neg) EX: 0.00280 = 2.80 x 10 ^-3 (moved to right to make smaller than 10, so neg)Unit
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