اجاية سؤال الدكتور هشام مروان فى الكيمياء التحليليه

تم

وضع اجابة سؤال الدكتور هشام مروان
لكثرة طلبه
وهو
what is the
importance of analytical chemistry in our daily life?
answer

Much of our daily
life is dependent on
chemical

analysis. Accurate quality-control analysis ensures the quality
of
the
food we eat, the medicine we use, the water we drink, and the air
we
breathe.
Among the sciences, analytical chemistry stands out
as a practically
versatile,
useful and important field.

Analytical
chemistry is comprised of
qualitative

and quantitative analysis. Qualitative analysis deals with
finding
out

which substances are in
analytical
sample

and quantitative analysis determines how
much
of each substance is in the sample. Analytical chemistry
analysis
has many applications in industry, medicine, biochemistry,
physiology,
geology,

oceanography, and environmental science. In addition,
analytical
chemistry

teaches special skills and techniques which have relevance for
physicians,

engineers, and many other professionals.

During the past few
years, the need for
skilled

analytical chemistry in Israeli’s industrial sector has
increased.
Consequently,

the study of analytical chemistry has grown in popularity.
Tel
Aviv

University has responded by accommodating more chemistry students
and
improving

the quality of chemistry studies.

The laboratory in Electroanalytical
Chemistry

and
Advanced Electrochemistry is one of the most popular chemistry
laboratories.

In
the laboratory, the students study the basics of
electroanalytical
methods, and
practice detecting minute amounts
of substances in water, medicine and
food.
Graduate students and
faculty research teams use the laboratory to
develop new
tests
and automated procedures for analysis that are currently performed
manually.

In addition, TAU researchers work in the laboratory, in
conjunction
with

researchers from Technion - Israel Institute of Technology - to
test
experimental

methods and new instruments in electroanalytical chemistry.

As little as ten years ago, many tasks
in
analytical

chemistry required hours of painstaking work, many complex
mathematical
calculations

and various measuring instruments. In today’s analytical
chemistry
–
as in so many other fields – computers and other sophisticated
instruments
have

simplified tasks and expanded possibilities. An impressive array of
powerful

and elegant tools for obtaining analytical (qualitative and
quantitative)

information about the comparison of the matter, are
available.
Students

of chemistry must understand and appreciate these tools in
order to
make

an intelligent choice among the many possible ways of solving an
analytical

problem. Deep understanding of the principles upon which the
method
are

based, is required in order to ensure proper use and a learned
evaluation
of

the experimental findings.

The aim of the
laboratory course is to
expose

the students to advanced analytical methods. The experiments
illustrate
not

only analytical applications, but whenever possible,
physico-chemical
parameters

are also determined. This latter feature helps to ensure that
the
students

acquire knowledge of the chemical principles involved in the
measurements

and an understanding in selecting the most appropriate
conditions
for

analysis.

The
experiments
have been selected to
demonstrate the basic
principles of the instrumental methods and to give
the
students a
sound grasp of the general applicability of methods to
different
types

of chemical problems. Experiments in trace analysis in real
systems
(for
example, determination of lead and cadmium in drinking water)
are
performed.

The

students are using the advanced
peripheral
instrumentation:
air-displacement pipettes, dispensers, piston burettes,
peristaltic
and metering pumps, which replace glass pipettes and
burettes. Flow
experiments

replace classical batch experiments. The rinsing of the
cells is
carried

out with small aquarium pumps (a step that saves a great deal of

time
and has increased student output by about 30%). Miniaturization
of cells
demonstrates to the students the possibility of economizing
in samples
and
reagents.

The electrochemical
experiments at the
student

laboratory have a common denominator – analysis
in
drinking water, using samples acquired from all around the
country.
This
exposes the students to ecological problems, to interferences
encountered

in
practical problems and to the need to choose methods according to
the
type of
species tested and their concentrations. Whenever
possible, more than
one
method is used for a particular analyte.

تمام
بس انا عايز السؤالين بتوعنا

مشكوور بجد مجهود اكتر من رائع [ندعوك للتسجيل في المنتدى أو التعريف بنفسك لمعاينة هذه الصورة]

متنساش إن الفرقة الثانية مجموعتين وأنت جبت سؤال المجموعة ب فياريت تجيب سؤال المجموعة أ.

فياريت تعدل علشان مزعلش. هههههههههههه

شكرااااااااااااااااااااااااااااااااااااااااااااااااااااااا على المجهود الرائع

بس انا فعلا مش معايا اسئلة مجموعه الف
حد يبعتهالى برساله خاصه وانا انزلهالكو

مهى المشلكة انى مش عارف اصلا الاسئلة

ممكن اعرف ايه المصدر الى انتى جبت منه حل السؤال ده

مجهود رائع يا محمود
مع اني مش معاكوا
بس دي معلومات اي حد عاوز يدخل قسم الكيمياء لازم يعرفها

سانكس

تسلم الأيادى مجهود رائع
تقبل مرورى

اجاية سؤال الدكتور هشام مروان فى الكيمياء التحليليه

اجاية سؤال الدكتور هشام مروان فى الكيمياء التحليليه

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