Chemistry

Chemistry Lecture 1
Introduction to Chemistry
What is Chemistry?
Chemistry is the cognition that investigates and explains the structure and properties of matter.
Why is Chemistry Important?
Almost every(prenominal) foods, beverages, and cleaning products have chemic compounds in them to preserve fallal or remove dirt.
Substance
Substances matter that has a uniform and find composition; either an element or a compound.
What approximately Molecules
A iota is formed when two or much atoms join together chemically.
A compound is a molecule that contains at least two different elements.
All compounds are molecules, but not all molecules are compounds.
Molecule
Molecule an uncharged group of two or more atoms held together by covalent bonds
Atom
Atom the smallest particle of a given casing of matter
The Basics of Chemistry
All chemical compounds can be uninvolved based on chemical or physical properties.
at a time separated, matter can be classified by its chemical or physical properties.
bodily Properties
Physical Properties characteristics of matter exhibited without a change of identity.
Physical Properties
They do not change identity What does this mean?
When ice melts, does it become something else?




Examples of Physical Properties
What are Physical Properties
Solubility
melt down point
change state point
colour in
Density
Electrical Conductivity
Physical State (solid, liquid, gas)
Melting Point
Melting Point the temperature of a solid when its crystal wicket gate disintegrates.
Melting Points
Sand (silicon dioxide, or Quartz): 1723 C
Salt (NaCl): 801 C
Sugar (glucose and dextrose have the same melting points): 146 C
Copper: 1083.4 C
Boiling Point
Boiling Point the temperature of a liquid when its vapor pressure equals the pressure exerted on its surface
Boiling Points
Alcohol - ethyl (grain) = 79 C
Ammonia = -35.5 C
Water = 100 C
Density
Density the amount of matter (mass) in a given unit volume
Density
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