CHEM 1000 Lecture Notes - Lecture 2: International System Of Units, Chemical Change, Calorie

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17 Nov 2017
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Matter
Chemistry- The study of matter and it’s changes
Matter- Anything that has mass and volume
Mass- measure of the amount of matter in an object (Doesn’t change on the moon)
Weight- measure of the gravitational force on the matter in an object (Change on Moon)
Categorizing Matter
Pure Substances
Elements- helium
Compound- Pure Water (H20)
Mixture- Composed of 2 or more substances
Heterogenous- wet sand
Homogeneous- Tea w/ sugar
Solid, liquid, Gas
Forms of matter
Physical Properties- without changing the substance
Physical Change- Identity is not altered (reversible)
Chemical Properties- Forming new substances is the only way to study these properties
Chemical change- Change in composition/structure (nonreversible)
SI units of measure
Know them! 1kg = 2.2lbs 1” = 2.54cm
Density- amount of matter in a given amount of space (d=m/V)
If the density of the object is greater than the density of the liquid, then the
object will sink.
If the density of the object is less than the density of the liquid, then the object
will float.
Physical Universe is made up of matter and energy
Energy- Ability to change matter (physical or chemical)
-Required to work (make something happen that wouldn’t happen by itself)
Heat vs. Temperature
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