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WCUPA - CHE 107 - Class Notes - Week 2

Created by: Kelly Johnson Elite Notetaker

WCUPA - CHE 107 - Class Notes - Week 2

School: West Chester University of Pennsylvania
Department: Chemistry
Course: General Chemistry for Health Science
Professor: Jacqueline Butler
Term: Winter 2016
Tags:
Name: Chem 107 Week 1 of notes
Description: This is Chapter one, so all of Tuesday's lecture. I am going to wait to post chapter two until we finish it next week. Almost all of this information will be on our quiz Tuesday,
Uploaded: 01/23/2016
5 5 3 88 Reviews
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background image Unit 1: Basic Concepts in Chemistry and Atoms and the Periodic Table- Chapter 1  1. Classification of Matter a. States of matter i. 3 states of matter 1. Solid- atoms are closely packed and hold a specific shape; atoms vibrate 2. Liquid- atoms are packed together loosely and are able to  move around one another; do not hold a shape, but 
instead take the shape of their container
3. Gas- atoms are very spread out and particles can move  freely in all directions allowing it to diffuse and fill its 
container
ii. Molecules in all three are in constant motion unless at absolute 0 (0° Kelvin) b. Composition i. Types 1. Pure Substances a. One type of particle
b. Always remain the same between samples
c. Elements- substances that cannot be broken 
down into simpler substances by chemical 
reactions
i. Basic building blocks of matter ii. Contain a single type of atom  d. Compounds- combination of two or more kinds of  atoms and is able to be broken 
down/decomposed
2. Mixtures a. Multiple types of particles
b. May show different intensive properties of its 
components c. Types i. Homogeneous- uniform throughout, looks  same 1. Ex: tea, paper ii. Heterogeneous- not uniform throughout 1. Ex: sand and water, salad dressing c. Physical and Chemical Properties i. Physical 1. Can be measured without changing the identity of the  substance 2. Remain the same always in one substance
3. Ex: melting point, boiling point, color, etc.
ii. Chemical  1. How a substance reacts with something else
2. Look for the words react, burn, combustion, or other 
words that indicate a change
background image 3. Ex: iron rusts, gasoline burns in air, nitric acid reacts with  sodium hydroxide, etc.  d. Physical and Chemical Changes i. Physical 1. Original substance still exists in a new form
2. Ex: boiling of water- the water can be recreated if you trap
the vapor; the tearing of paper- it is still paper just smaller ii. Chemical 1. A new substance  has been created; you cannot get the  old one back since it has become something else 2. Ex: a boiled egg- you cannot regain the uncooked egg  since it has created a new substance; burnt paper- you 
cannot have white paper again as it has become ash
e. Intensive and extensive properties i. Extensive 1. Depends on the amount of a substance
2. Think EXTERNAL
3. Mass and Volume are examples
ii. Intensive  1. Is based on the substance itself not the quantity
2. Think INTERNAL
3. Color, Density, or hardness are considered intensive
f. Chemical Observations i. Qualitative 1. Physical descriptions, properties, any word definitions of a substance ii. Quantitative 1. Is any numerical value associated with a substance  iii. Accuracy 1. Closeness to a true or accepted value
2. In darts, if you shoot all close to the bullseye
iv. Precision 1. Closeness of measurements to each other
2. In darts, if all shots are not close to the bullseye but close 
to each other **** The more tics on a ruler, thermometer, etc. make it more accurate
and precision becomes easier
***Digit of inaccuracy/ uncertainty- the number you guess beyond the 
closest known value (WHAT YOU KNOW PLUS ONE VARIABLE NUMBER)
2. Significant figures  (REVIEW EXAMPLES AND HER WORKSHEETS) a. What i. The digits displayed in any measurements that are known with a certainty plus the digit of uncertainty b. Guidelines for significant digits i. Digits 1-9 are ALWAYS significant ii. Leading zeros are nit significant iii. If a zero is surrounded by a 1-9, it is significant iv. Trailing zeros are only significant if followed by a decimal point

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School: West Chester University of Pennsylvania
Department: Chemistry
Course: General Chemistry for Health Science
Professor: Jacqueline Butler
Term: Winter 2016
Tags:
Name: Chem 107 Week 1 of notes
Description: This is Chapter one, so all of Tuesday's lecture. I am going to wait to post chapter two until we finish it next week. Almost all of this information will be on our quiz Tuesday,
Uploaded: 01/23/2016
4 Pages 46 Views 36 Unlocks
  • Better Grades Guarantee
  • 24/7 Homework help
  • Notes, Study Guides, Flashcards + More!
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