University:
Felician University
Course:
CHEM-001 | Basic Chemistry
Academic year:

2024
Views:

479

Pages:

20
Author:

Clint W.

Intro to Chem & Measurements ’ In this map, gray areas denote metric territory. English units are used primarily in red zones. Title of Notes: Metric Measurement MEASUREMENTS • Science is based on measurements • All measurements have: – Magnitude – Uncertainty – Units NUMBERS • Math is based on numbers • Exact numbers are obtained by: – Counting – Definition Also known as the “SI system” • “SI” stands for “Le Syste’me Internationl d’Unites” • Law in France since 1790. • It is based on the number 10 • ALWAYS used in science Other Base Units to Know Quantity Volume Count/Quantity Temperature* Base Unit liter mole Celsius Symbol L mol C *temp can be C or K, depending on what you are doing Volume of a solid length x height x width m3 Usually derived units are expressed with positive/negative exponents ex. m2 Temperature Conversion you need to know K = °C + 273 PREFIXES Prefixes go in front of the unit. Changing prefix by moving the decimal 103 102 101 Kilo Hecto Deka (k) (h) (da) 100 (unit) 10-1 Deci (d) 10-2 10-3 Centi Milli (c) (m) 10-6 Micro (µ) King Henry Died Unexpectedly Drinking Chocolate Milk _ _ Moo KHDUDCM__ __ µ • Steps to move decimal • Start at given prefix • Count # of letters (prefix initials) to get to desired prefix • Note direction • Move decimal same number as letters counted in same direction • May need to add zeros to the left or right of original decimal. Practrice 0.5 km = ________ dm King Henry Died Unexpectedly Drinking Chocolate Milk _ _ Moo KHDUDCM__ __ µ 4 Right Move decimal 4 Right: 0.5000 km = 5000dm (note: needed to add extra zeros to the right of decimal) Practrice 2000 cm = ________ m King Henry Died Unexpectedly Drinking Chocolate Milk _ _ Moo KHDUDCM__ __ µ 2 Left Move decimal 2 Left: 2000 cm = 20m (note: meter is base unit, so moving to U) Conversion WS Do problems 1-10 now for a stamp Finish 11-20 as Homework