Section 1.1 – 1.2 What is Chemistry Classification of Matter Bill Vining SUNY College at Oneonta.
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Transcript of Section 1.1 – 1.2 What is Chemistry Classification of Matter Bill Vining SUNY College at Oneonta.
![Page 1: Section 1.1 – 1.2 What is Chemistry Classification of Matter Bill Vining SUNY College at Oneonta.](https://reader030.fdocuments.net/reader030/viewer/2022032804/56649e4d5503460f94b42c56/html5/thumbnails/1.jpg)
Section 1.1 – 1.2 What is Chemistry
Classification of Matter
Bill ViningSUNY College at Oneonta
![Page 2: Section 1.1 – 1.2 What is Chemistry Classification of Matter Bill Vining SUNY College at Oneonta.](https://reader030.fdocuments.net/reader030/viewer/2022032804/56649e4d5503460f94b42c56/html5/thumbnails/2.jpg)
What is ChemistryClassification of Matter
In this section…
a. Scale of chemistry
b.Measuring matter
c. Pure matter on the macroscopic scale
d.Mixtures on the macroscopic scale
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The Scale of Chemistry
Chemistry is the study of matter on the atomic/molecular scale. Also called nanoscale.
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The Scale of ChemistryMacroscopic: can be seen with unaided eye.Microscopic: can only be seen with an optical microscopeAtomic: too small to be seen even with optical microscope
Examples:
soccer ball: methanol molecule:
sand grain: bacterium:
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The Scale of Chemistry
Chemistry is the study of matter on the atomic/molecular scale. Also called nanoscale.
![Page 6: Section 1.1 – 1.2 What is Chemistry Classification of Matter Bill Vining SUNY College at Oneonta.](https://reader030.fdocuments.net/reader030/viewer/2022032804/56649e4d5503460f94b42c56/html5/thumbnails/6.jpg)
How We Measure Matter
Bulk scale: Mass Attraction to magnets
Atomic scale: Interaction with electromagnetic radiation-- -- VIS and UV -- IR -- Xray -- Radio + Magnetic field
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How We Measure Matter
Key feature of chemical study:
We can’t see individual atoms and molecules, so all our knowledge is implied by measurements,mostly of bulk samples.
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Classification of Matter
Lot’s of ways:
solid, liquid, gas composition magnetism color hardness
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Classification of Matter
As chemists, we do this on atomic scale and macroscopic scale
Atomic Scale: atoms vs. molecules
Macroscopic Scale: elements vs. compounds
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Classification of Matter
Atomic Scale: atoms vs. molecules
Atoms
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Classification of Matter
Atomic Scale: atoms vs. molecules
Atoms Molecules: collections of atoms that are held togetherby chemical bonds.
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Classification of Matter
elements vs. compounds
Pure Element: collection of atoms of a single element
Compound: formed when two or more elements are combined in a defined ratio
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Classification of MatterNotes 1: Both elements and compounds can form molecules
Notes 2: Compounds can be collections of molecules, or large extended structures
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Classification of MatterNotes 2: Compounds can be collections of molecules, or large extended structures
solid CO2; “dry ice”
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Classification of Matter
Pure Substances vs. Mixtures
Pure substance: only one type of element of compound
Mixtures: multiple types of elements or compounds
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Classification of Change
Physical change vs. Chemical change
Physical change: changes the state but not the chemical composition
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Classification of Change
Physical change vs. Chemical change
Chemical change: changes the chemical composition
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Classification of Change
Physical change vs. Chemical change
Physical change: same stuff, different state
Chemical change: different stuff
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Classification of MixturesHeterogeneous vs. Homogeneous
Homogeneous mixture: composition constant throughout
Heterogeneous mixture: non-uniform composition
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Classification of Matter Chart
Examples: filtered air: salt water:
filtered water: gold bar:
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Classification of Matter Chart
-- mixtures can be separated by physical means-- compounds can be “separated” by chemical means