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chemistry school 2


indra saepul alam al-rasyid

on 19 November 2012

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Transcript of chemistry school 2

Hydrolisis Subject Matter Cations and anions hydrolysis cations and anions hidrations The Acidity of Salt Solutions experiment concept map phenomenon definition and hydrolysis concept Subject Matter and Concept Map method and approach evaluation and assesment curriculum glosaries Chemistry for High School Universitas Pendidikan Indonesia 2012 difficulties and misconception media Phenomenon the pH of water from different source generally are different water can dissolve many kind things and one of them are salt that influence the pH changes not at all salt when we add it into water
could change the pH the farmers add fertilizers to make the land at good pH condition for the plants is fertilizers consist of salt too?? in purification water there are many industries add some of salt too to get the pure water
how does it works?? Method and Approach to get learn this matter student should be know about Acid Base concept before we can bring this matter with talkative methods and experiments in this slide the method that can you use is with phenomenon approach and then you can explain the matter based on the curriculum What is Hydrolysis??? Words Hydrolisis is come from hydro=water and lysis=being apart a compound is being hydrolysis when in the solution could ionized the water and react with it and a compound that being ionized when soluble in water, and surrounded by water molecule because of the intermolecular interaction between salt molecules and water molecule is called hidration Hidration of cation and anion Cations and Anions Hydrolysis The Acidity of Salts Solutions 1. Neutral Salt Solutions consist of salts that form from weak and strong acid 2. Basic Salt Solutions consist of salt that form from weak acid and strong base 3. Acidic Salt Solutions consist of salt that form from weak base and strong acid 4. Total Hydrolyzed Salt Solutions consist of salt that form from weak acid and weak base Experiments Missconceptions Melting and dissolving are the same thing. [Lee (93), MS: Key]
Salt becomes liquid salt when it dissolves. [Kokotas (98), D10]
Salt is not hard (or dense) enough to resist dissolving. [Kokotas (98), D10]
Chalk won't dissolve because it is too heavy (or hard). [Schmidt (97), S]
Water has the force to dissolve salt. (* A.8) [Kokotas (98), D10]
Things become each other in solution.
A strong solution of a salt contains more of that salt than a weak solution, without regard to the quantity of solution.
hard to understood the conjugative concept Media Analysis Of Curriculum glosaries Basic competences To understand characteristics of acids, bases, and salts aqeuos, measuring method, and applications Determining the type of salt that has hydrolyzing in water and the pH of the salt solution. Competency Standards Competency Standards and Basic Competences Acid : ‘æsid = Asam
Base : beis =basa
Salt : sәlt = garam

Acid-base indicator : ‘æsid beis indә‘keitәr = indikator asam basa

Litmus paper : litmәs peipәr= kertas lakmus

Conjugate acid : kanjәgeit ‘æsid=asam konjugat

Conjugate base : kanjәgeit beis= basa konjugat

pH : pie heij=derajat keasaman

pOH : pie ow heij=derajat basa

Acid ionization constant:‘æsid ‘aiәnә’zeisyәn
‘kanstәnt=konstanta ionisasi asam

Base ionization constant: beis ‘aiәnә’zeisyәn ‘kanstәn=konstanta ionisasi basa

Neutralization reaction : nyuwtrәlaizeisyәn rie’æksyәn=reaksi netralisasi

Dilution : dә ‘luwtsyәn = pelarutan

Precipitation : prisipә ‘teisyәn=pengendapan Conclusion 1. Generally, national curriculum is similar with international curriculum. But the different is distribution of some topics in national curriculum lagging far behind than international curriculum.

2. (1) teachers’ lack of interest in
students’ misunderstandings, (2) the use of everyday languages and metaphors; (3)
different meanings between chemistry terminologies and everyday languages; and (4)
unclear and over-simplistic representations in textbooks

3.. Form of evaluation in national curriculum is similar international curriculum. But assessment objective in national and international curriculum are different. In international curriculum consist of handling information and problem solving assessment objectives, comprehension, application, analysis, then in national curriculum didn’t consist it. National curriculum only recall and comprehension. Recommendations A substances, must be slender and sharp.

In learning process that must learn about micro level should be accompanied by illustration, images or other media such as video, animation, etc. in order that more interesting and students more understanding. In learning, a teacher should not monotonous that only use speech methode. Its should be use the expository methode or demonstration methode. But, do not make a misconception for student.

Make the phenomenon as a learning approach should be make the student's more understood Difficult to determine the categories of strength of acids and bases, finally that will be impact on the calculation which have to using a buffer formula, salt hydrolysis, etc.
Difficult to determine the equation of the reaction between acids and bases, especially when the acid and base are different valence. Learning difficulties Indra Saepul Alam 0905575 Evaluation and Assessment National Curriculum
(Unit Level Education Curriculum 1.Multiple Choices
The acid conjugated from HSO4- is….
a. H2SO4
b. SO42-
c. H2O
d. OH-
e. H3O+ 2. Essay
On a laboratory table, there are 4 beaker glasses, each of which is filled with aqueous of sulfuric acid (accumulator), aqueous of soaps, aqueous of limestone, and aqueous of vinegar. If red litmus paper and blue litmus paper are dipped into each of the solutions, what will happen? International Curriculum This table shows the soil pH ranges by different crops for growth Questions :
a. A farmer plants peanut and millet crops. Only the peanut crops grows well. Predict the pH of the soil ……………………………………………………[1]
b.Which other crop is most likely to grow well in the same soil? ……………………………………[1]
c.The farmer adds calcium hydroxide, Ca (OH)2, and ammonium sulphate, (NH4)2SO4, to the soil.
Explain the purpose of using each compound..………………………………………… [3]
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