Download APPLIED CHEMISTRY CHEM 101

APPLIED
CHEMISTRY CHEM
101
Instructor: Dr. Mehr Nigar
What is Chemistry?
Chemistry is the study of the
composition, structure, and
properties of matter and the
changes it undergoes
WHAT IS ENGINEERING?
Chemistry and Engineering??
Design
Materials Science
& Engineering
Materials
Molecules
Chemistry
Atoms
Protons, Electrons &
Neutrons
Sub-Atomic
Applied Chemistry
1.
2.
3.
4.
Macroscopic or bulk observations
Symbolic representation of bulk
observations.
Microscopic or molecular visualization
of molecules & their behavior.
The ability to make the connection
between 1, 2 and 3!
Boiling of Water
Bulk Observations??
What is in the bubbles??
i) Air
ii) Water Vapor
iii) H2 & O2 gas
iv) Vacuum
Symbolic Description
Molecular Description
Atomic Theory of Matter
All matter is composed of atoms
 Atoms of a given element have identical
properties
 Atoms combine in whole number ratios
 Atoms cannot be destroyed or created in
chemical reactions.

Scanning Tunneling
Microscope (STM)
STM
Atomic Mass

Average mass of an atom (contained
mainly in the nucleus)

1amu = 1.66 x 10-27 kg

H = 1.01 amu (listed in periodic table)
Ordinary samples contain
many atoms/molecules!
A typical drop of water weighs about 0.05
grams. How many molecules of water are
there in one drop of water???
Atomic weight of H = 1amu; O = 16 amu
Answer = 1.7 x 1021 molecules!