chapter 1 meaning of chemistry

8/8/2019 Chapter 1 Meaning of Chemistry

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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

chapter 1 meaning of chemistry

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