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CHEM 1311 Chapter 1

Chapter 1

Chemistry Study of matter, its properties, and the changes it undergoes
Matter Anything that has mass and takes up space
Element A substance which can not be decomposed to simpler substances
Compound A substance which can be decomposed to simpler substances because it is made up of more than one element
Atom Building blocks of matter
Intensive properties A characteristic of matter that does not depend on the amount or size of the sample. Examples: density, boiling point, color (important for IDENTIFYING substance)
Extensive properties A physical property of matter that changes depending on the amount of substance present in a sample. Examples: mass, volume, energy
Physical changes Changes in matter that do NOT change the composition of a substance. Examples: shredding paper, breaking glass, boiling water
Chemical changes A process where one or more substance turns into entirely new substances with different physical and chemical properties. Examples: Fireworks, frying egg, photosynthesis
Energy The capacity to do work or transfer heat
Precision How close repeated measurements of the same thing are to each other. (Consistency)
Accuracy How closely individual measurements agree with the correct, or "true" value. (Correctness)
Created by: nancyq
 

 



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