notes on matter

Topics: Chemistry, Chemical substance, Chemical reaction Pages: 3 (431 words) Published: September 25, 2013
Unit 1 Notes
Chapter 3

Matter
Observation v. Inference
Observation:
Quantitative or qualitative
___________________________________________________
Inferences:
Something that you know from ____________________________ •Ex. “made of wood”, “wax”
Physical v. Chemical Properties
Physical Properties:
Can be observed without changing the chemical makeup of a substance •Examples:
Chemical Properties:
Describes a chemical change & the kinds of chemical reactions that a substance undergoes Examples:
Physical Changes
Changes in physical properties
______________________________________________________________________ Examples:

Chemical Changes
One or more substances (reactants) are transformed into one or more difference substances (products) •reaction of sodium with water

Evidence of Chemical Reactions
__________________________________________
______________________________________: gives off heat
______________________________________: absorbs heat from surroundings •__________________________________________
__________________________________________
__________________________________________
__________________________________________
Conservation of Mass
Late 18th century, scientists started to gather quantitative data during experiments •Using analytical balance, found that the mass before and after chemical reactions was the same •Occurred repeatedly so they summarized in scientific law •______________________________________________________________________

Matter

Mixtures

Elements & Compounds
Element:
Pure substance that cannot be separated into simpler substances by physical or chemical means •Periodic Table: organizes elements based on physical and chemical properties •Compound:
combination of 2 or more elements that are combined chemically •Properties of cmpd differ from those of elements (salt and water)

Mixture
Combination of 2 or more pure...
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