Reaksi kimia
Jumat, 26 April 2013
Jumat, 19 April 2013
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MID
SEMESTER BAHASA INGGRIS
Nama : Altus Baruati
NIM : 06122503008
Dosen Pengampu :
1. Sofendi, M.A., Ph.D.
2. Dr. Suhuri, M.Pd.
Hi
! My name is Altus Baruati. I am 24 years old. I was graduate from 600 primary
school Palembang graduated in 2001, 19 high school
seniors graduated in 2004 Palembang, Muhammadiyah
1 Senior High School Palembang graduated in 2007. Then,
I went to college
through the selection of new admissions
(SPMB). And I
graduated in Inderalaya
Sriwijaya university mathematics education majors
and natural science courses chemistry education.
Then I underwent a
student activities as appropriate.
Such as work assignments,
presentations, practical work in the laboratory, creating reports, and others. In years passed right end on Wednesday 27th April
2011, I followed
the thesis examination. I am
grateful for my graduation.
Subsequently, on 22 June 2011 I attended the
Unsri graduated to
99 and on 23 June
2011 following my
graduation. Then, I teach, apply
knowledge, and educating boys and girls in high school Srijaya Negara Palembang
and 3 public
high school districts Lais Banyuasin district.
Appropriate department, I give chemistry to
my students.
Okay,
I'll tell you about my experience teaching chemistry. I teach a class X
material is the oxidation
number. I explain the material in advance, explaining
an example, as well as providing training. Meaning
or oxidation state Oxidation Numbers Oxidation
Numbers an element in a compound equals
the number of electrons that have
been released or captured / bound
by the atoms of the element in the formation of a
compound. Oxidation state can
also be described as the cargo of an element in a bond with other elements. There are two oxidation states, a
positive oxidation state of an element = the number of
electrons is released while the
negative oxidation states = number of electrons captured
or received by
any other element.
Rules
in Determining Oxidation
Numbers
1. All
free elements or elements
that are not bonded to other elements such as
for example H2, O2, Cl2, K, Fe and others
then oxidation states is 0
2. Ion
has an oxidation state equal to the
amount of cargo, eg
Cl-
Oxidation Numbers = -1; Li +
= +1; PO43- = -3; SO42- = -2
3. In
its compounds : Or F Fluorine, Chlorine,
Bromine and all
elements located in
group VIIa or
halogen which is the most electronegative element,
Oxidation = -1,
while the VIA group
(S and O) = -2. The oxidation
number of O = -2 except F2O compounds, O = +2. On the compound
H2O2 and BaO2,
O = -1. On the compound KO2,
O = -1 / 2.
H = +1 oxidation state, except in compounds NaH
and KH, H = -1. Group IA alkali or oxidation state = +1.
IIA alkaline oxidation
state = +2
For example:
Calculate the oxidation number in bold
below ! H2O
Do we
have to know the rules
in determining the oxidation state
in both free element,
the element of the charged, nor compounds are
uncharged and charged
compounds.
Here's the answer :
·
H2O
Oxidation
Numbers H + Oxidation Numbers O = 0
(2
x Oxidation Numbers H) + Oxidation
Numbers O = 0
(2
x Oxidation Numbers H) + (-2) = 0
(2
x Oxidation Numbers H) = +2
Oxidation
Numbers H = +1
After I
explain, give examples,
and exercises like the above, a lot of my
students are interested
and understand the
material. This is evident from
the exercise they are doing an average student I
can answer. Then, I take a daily test values
with the advance one by one student to work on the problems of oxidation states.
I was amazed
to one of my students,
the name is R.A. Anggun class X.2 Plus. She very
quickly do the problem that I have provided. Matter of fact I gave quite
difficult. Not only
in the subjects of
Chemistry, Anggun also discerning in other subjects. Besides its gorgeous,
she also has a
good personality. Anggun became the first champion
in its class. I as
well as his homeroom teacher constantly monitor progress.
I
always remember that
Anggun always ask
me about the material that
he has not understood.
She always said :
Could you return the material to
explain that I did not understand
this? And I would always answer : of course.
Oh yes, Anggun
never made me
laugh once when
she asked: miss,
will you marry your
close friend? My response can only smile answered
her question.
That
bit of my experience
during the teaching and educate the
students. There's something funny,
fun, annoying, angered,
annoyed. All in One. However, I still
love my job is because
I love to share my
knowledge which is
not only the world but also the good of the
good in the heaven, and InsyaAllah
willing be a amal jariyah for me. Amiin …
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