chemistry week one
chemistry week one chem135
Northampton Community College
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This 2 page Class Notes was uploaded by Esraa Hagag on Thursday September 22, 2016. The Class Notes belongs to chem135 at Northampton Community College taught by edward s fleming in Fall 2016. Since its upload, it has received 3 views. For similar materials see chemistry of life in Chemistry at Northampton Community College.
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Date Created: 09/22/16
Chapter 1 section F Scientific notation Measurement can involve very large number or very small number For number greater than 1 move the decimal point to the left until there is only one number to left of the decimal point For numbers smaller than 1 move the decimal point to right until only one number to left of decimal point Look at page 7 in your book number 1.26 Chapter 2 Measurement Major goals of chemistry: 1. Make observations and collect facts, it usually involves measurement also non quantities or qualitative e.g. color or odor 2. To explain the how and the why of physical and chemical events e.g. pure water boils at 212degree F at one atmosphere pressure units of measurement: 1. Number 2. Unit Counting is not measurement For measuring you need some device like scale or ruler We use metric system because: 1. It’s used worldwide 2. Easy conversing of units Length 1. English system 12 inches=foot 3 feet= yard 1760 yard= mile 2. Metric system 10 millimeters= centimeter 100 centimeters= meter 1000 meter= kilometer Meter: It Is the basic unit of length in metric system. Volume: Basic unit in liter (L) ML (often used for liquid medicine) = 0.001 L DL (used in blood work reports) = 0.1 L Mass: basic unit is gram (g) Mg= 0.001 g Kg= 1000 g
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