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Meaning of Chemistry
CHEMISTRY
~ study of the composition,structure, properties and interactionsof matter.
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In chemistry,
all matter is considered
as chemical.
eg. : air, water, metals
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We use chemical in almost
every aspect of lives :
NaCl saltVinegar preserving food
Calcium carbonate flooring
Silicon electrical devices
Copper wire
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Chemistry related careers
Doctor
Biochemist
BioengineerDoctor
Pharmacist
Pathologist
Nutritionist
Chemical engineer
Food technologistForensic scientist
Pollution controller
Geologist
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Scientific Method
Systematic method used
by scientists to solve problemsIn science.
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Scientific Method
1. Makingobservation
2. Making inference
3. Identifying problem4. Making hypothesis
5. Identifying
variables6. Controlling
variables
7. Planning an
experiment8. Collecting data
9. Interpreting data
10.Makingconclusion
11.Writing report
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Making Observation
Gathering information about a
phenomenon using our five senses :
sight, hearing, smell, taste & touch
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Making Inference
Making a smart guess or
tentative explanation about
the phenomenon based on the
observation.
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Identifying Problem
Asking question based on the
inference made.
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Making Hypothesis
Making a general statement
about the relationship between
a manipulated variable &
a responding variable to explain
the question asked.
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Identifying Variables
A variable is a factor that
affects the results of an experiment.
Manipulated variable :
factor that is purposely changed in anexperiment.
Responding Variable :
factor that changes with the manipulated
variable. Fixed variable :
factors that are kept constant throughout anexperiment.
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Controlling variables
Deciding how to manipulate
the chosen variable, what to
measure & how to keep the
fixed variables constant.
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Planning an Experiment
Determining the
list ofmaterials & apparatus,
the exact procedure of the experiment,
the method of collecting data &
ways to analyse & interpret thecollected data.
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Collecting Data
Making observations or
measurements & recording the datasystematically.
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Interpreting Data
Organising & analysing data.
Calculations, graphs orchartsare usually drawn to look for any
relationship between the variables.
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Making Conclusion
Making a statement about the
outcome of the experiment & whetherthe hypothesis is accepted / rejected.
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Writing Report
Communicating the details
of an experiment.
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General format of a report Title :
Aim : Problem statement :
Hypothesis :
Variables :
(a) Manipulated variable :(b) Responding variable :
(c) Fixed variables :
Materials :
Apparatus :
Procedure : Observations / results :
Interpreting data :
Discussion :
Conclusion :
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Scientific attitudes & noble values
should be inculcated in allchemistry investigations.
For example :
An experiment is planned & carried outsystematically & diligently.
All observations & collection of datamust be done honestly & objectively.
Interpretation of data, inferences &conclusion are made with rational,critical & analytical thinking.
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Success is the proliferation
of your good points ;failure is the accumulation
of your weak points.
~ Still Thoughts
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