welcome to chemistrywelcome to chemistry. science a search for facts about the world around us...
TRANSCRIPT
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Welcome tochemistry
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Science
a search for facts about the world around us
understanding the past , predicting the future
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Aristotle (384-322 B.C.)
one can work out all the laws that govern the universe by pure thought
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Roger Bacon (1300’s)
science should base its reasoning on experimental evidence.
science replaces philosophy
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A procedure for processing and understanding certain types of information
science
If there is no test for its possible “wrongness”, then it is not scientific.
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Theory
Experiment
Revised
Theory
HypothesisTestable statement or prediction
ObservationsExisting knowledgeQualitative dataQuantitative data
TheoryHypothesis supported by many experiments
Scientific Law summary of accepted facts of nature
The Scientific Method
Conclu
sions
HypothesisRevised
Experiment
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The Scientific Method
click on any underlined word for its definition
Observation
LawTheoryHypothesis
Experiment
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Science and Technology
science is a method of answering theoretical questions
technology is a method of solving practical problems.
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A tale of two chemicalsOzone
- a chemical located in the stratosphere that absorbs most uv radiation from the sun. - naturally occurring
- made up of three oxygen atoms
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O3
UV radiation
stratosphere
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O2O2 O2
UV radiation
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infrared radiation
O3 O3
heat
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Chemists are problem solvers
Problem:
In recent years ozone has been depleted at an alarmingly fast rate.
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1990198019701950
100
400
300
200
500
Ozo
ne le
vel (
DU
)October Ozone Concentrations
Year
1960 2000 2010
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A tale of two chemicalsOzone
- a chemical located in the stratosphere that absorbs most uv radiation from the sun.
Chlorofluorocarbons ( CFCs )- a group of chemicals that contain carbon, fluorine and chlorine.
- not naturally occurring
- used as a coolant and as a propellent
- naturally occurring
- made up of thee oxygen atoms
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CF2Cl2 CFCl3
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1990
1983
1981
1977
160
280
240
200
320C
FC-1
1 (p
pt)
Concentration of CFCs in the Atmosphere
Year
1979
1987
1989
1991
120
1993
1995
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O3
UV radiation
CF2Cl2
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O3
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O3
CF2Cl
Cl
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O3
+
Cl
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O2
ClO
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O2
+
ClOO
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O2
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O2
O2
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Example
CF2Cl2 CF2Cl + Cl
In recent years ozone has been depleted at an alarmingly fast rate by chloroflorocarbons (CFCs).
A CFC molecule such as CF2Cl2 is first decomposed by UV radiation:
The chlorine radical then reacts with ozone as follows
ClO + O2Cl + O3
ClO + O Cl + O2
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ClO + O2Cl + O3
ClO + O Cl + O2
2O2O + O3
catalyst
intermediate
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Potentialenergy
progress of reaction
Uncatalyzed pathway
2O2
O + O3
Ea
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Potentialenergy
progress of reaction
Catalyzed pathway
Ea
O3
O2
+ Cl
+ Cl
O + ClO
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chemistry
The study of matter, its structure, properties, composition and changes that matter undergoes.
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chemistry
seeks to explain submicroscopic events that lead to macroscopic observations.
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(slides that follow are linked to earlier ones)
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lawa concise verbal or mathematical
statement of a relationship between phenomena that is always the same
under the same conditions
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theorya unifying principle that explains a
body of facts and those laws that are based on them
The Why
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hypothesisa tentative explanation for a set of observations
leads to “if… then…” questions
test of theory