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Week1Lecture.pptx
CHEMISTRY
I
Definition of Chemistry
- the study of matter and the changes it undergoes
Divisions of Chemistry:
Inorganic
- that branch of chemistry that studies the properties and reactions of elements, excluding organic or certain carbon-containing compounds
- study of the elements and their reactions
- all metals and non-metals
Organic
- chemistry of carbon and carbon containing compounds
- chemistry of those things derived from living or once-living things
Biochemistry
- Biological chemistry
- Physiological chemistry
- involves all the living processes in health & disease
- organic and inorganic are “applied” here
- the branch of chemistry dealing with compounds produced by living organisms
Embalming Chemistry
- chemistry of the chemical processes involving dead organic substances in terms of decomposition, disinfection and preservation
Thanatochemistry
- the study of those physical and chemical changes in the human body that are caused by the process of death
Chemical Measurements
Chemists Use “The Metric System”
- based on the decimal system
- multiples of 10
giga - billion
mega - million
kilo - thousand
hecto - hundred
deka - ten
deci - tenth
centi - hundredth
milli - thousandth
micro - millionth
nano - billionth
Length
Basic unit -
Meter
Volume
Basic unit -
Liter
Mass and Weight
Basic unit -
Kilogram
The laboratory basic unit -
Gram
- 1/1000 Kg
Mass - Definition
- a measure of the quantity of matter a body contains
Weight - Definition
- a measure of the gravitational attraction of the earth for the body
Heat
- the energy that causes there to be changes in matter
- measured in calories
- amount of heat necessary to raise the temperature of one gram of water one degree C
Temperature
- measures the intensity of heat
- the hotness or coldness
- Degree Celsius
- used in most scientific study
Basic unit -
F C
Boiling Point of Water
Normal Body Temp.
Freezing Point of Water
Required Temperatures:
212
100
98.6
37
32
0
Energy
Definition
- the ability or capacity to do work
There are two (2) “basic” types:
Potential Energy
- stored energy
- has the “potential” to do work
Kinetic Energy
- the energy of motion
Chemical Energy
- energy associated with chemical reactions
There are two types of chemical reactions when looking at them from a chemical energy point of view:
Endothermic Reaction -
Exothermic Reaction -
Absorbs heat
(feels cool)
Releases heat
(feels hot)
