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Dialog u sing english to show cause and effect Eka      : Hallo Fauzan Fauzan : Hi Eka Eka      : Fauzan, I want to ask you, what is ester? Fauzan : Ester is a compound with a functional group - COO - in the middle of alkyl, R 'and R'' represents a carbon chain. Eka      : What happens if I react acetic acid with ethanol in an acid catalyst? Fauzan : It will produce ethyl acetate (ester) and also water. Ethyl acetate is an example of an ester . Eka      : Try to explain the ester's reaction?          Fauzan : The reaction of an alcohol with a carboxylic acid with an acid catalyst is a Fischer method. The esterification reaction involves very slow reversible reactions, but when using mineral acid catalysts such as sulfuric acid (H 2 SO 4 ) and hydrochloric acid (HCl) equilibrium will be achieved in a short period of time...

Using english to give evidance Some chemical changes are easy to observe. The products formed by the rearrangement of atoms look different than the reactants. Other changes are not easy to see but can be detected in other ways. Color Change Substances often change color during a chemical reaction. For example, when gray iron rusts, the product that forms is brown, as shown in the photograph below. Formation of a Precipitate Many chemical reactions form products that exist in a different physical state from the reactants. A solid product called a may form when chemicals in two liquids react, as shown in the photograph below. Seashells are often formed this way when a sea creature releases a liquid that reacts with seawater. Formation of a Gas Chemical reactions may produce a gas, like that formed when antacid pills are mixed with stomach acid. The photo-graph below shows an example in which carbon dioxide gas is produced by a chemical reaction. Tempe...

Using english to show cause and effect             Chemical reactions are a natural process that always results in the conversion of chemical compounds. The compounds or the initial compounds involved in the reaction are referred to as reactants. Chemical reactions are usually characterized by chemical changes, and will result in one or more products that typically have different characteristics of the reactants. Classically, a chemical reaction involves a change involving the movement of electrons in the formation and disconnection of chemical bonds, although essentially the general concept of chemical reactions can also be applied to the transformation of elementary particles such as nuclear reactions. There are two changes: physical and chemical change. Chemical changes are changes in substances that produce new substances. For example: the paper before being burned has properties different from the paper before being burn...

Articles of Chemistry Radiation Therapy             Radiation therapy has been used as a cancer treatment for over 100 years, beginning with the discovery of x-rays in 1895 by Wilhelm Röntgen. The field of radiation therapy began to grow in the early 1900s primarily because of the groundbreaking work of the Nobel Prize-winning scientist Marie Curie, who discovered the radioactive elements of polonium and radium. This medical treatment and research just started in a new era. Radium was used in various forms until the mid-1900s when cobalt and cesium units began to be used. Medical Linear accelerators have been used as well as radiation sources since the 1940s.             With the invention of Godfrey Hounsfield computed tomography (CT) in 1971, three-dimensional planning became a possibility and created a shift from 2D to 3D radiation delivery. The emergence o...

Tugas Tersetruktur Dialogue of teacher and students: about chemistry                         The bell rang time for Mr. Fauzan to enter the class XI IPA 1 Mr. Fauzan : Morning all? All students: Morning teacher. Mr. Fauzan : Today we will learn about acids and bases. Does anyone know what is acid? Dina : Me sir  , I think acid is a acidic compound. Mr. Fauzan : Yes, that's right Dina. Then there is another bases, does anyone know what is a base? Ayu : Me sir, I think the base is a bitter-tasting compound. Mr. Fauzan : Yes, it is true what is delivered ayu. Well, the theory of acids and bases that we will study there are three, theory according to Arrhenius, Bronsted-Lowry, and Lewis. According to the theory of Arrhenius acid is a substance which if dissolved in water will produce H ⁺ ions, whereas a base is a substance that if dissolved in water produces OHˉ ion. ...

Tugas Terstruktur: 40 vocabulary English Indonesia Adhesion Adhesi Addition Adisi Alkanes Alkana Alkenes Alkena Alkyne Alkuna Amphoteric Amfoter Bond Ikatan Buffer Penyangga Covalent Kovalen Calorimeter Kalorimeter Coagulation Koagulasi Coagulants Koagulan Cohesion Kohesi Colloid Koloid Colligative Koligatif Corrosion Korosi Cracking Perengkahan Cycloalkanes Sikloalkana Dipole Dipol Dissociation Disosiasi Electrolyte Elekrolit Emulsion Emulsi Enthalpy Entalpi Equilibrium Kesetimbangan Froth Buih Gild Menyepuh Hydrocarbons Hidrokarbon Hydrophilic Hidrofil ...