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일반화학실험 Solubility of Potassium Nitrate(질산칼륨 용해) 예비/결과 보고서

1. Purpose • To improve purity of contaminated material by using the property of change of solubility at different temperatures • Key concepts - Solubility- chemical equilibrium2. Theory • Concepts of key words ‣ Solubility : It is the property of a solid, liquid, or gaseous chemical substance called solute to dissolve in a liquid solvent to form a homogeneous solution. ‣ chemical equilibrium : It is the state in which the chemical activities or concentrations of the reactants and products have no net change over time.<중 략> The numerical value of Ksp is related directly to the solubility of the salts. • Temperature`s effect on solubility. - Endothermic Reaction (ΔH>0): When T or ΔS is sufficiently high, solute can be dissolved because ΔG can take negative values. - Exothermic Reaction(ΔH<0): Because ΔG has negative values, solubility increases as temperate increases.

자연과학| 2013.05.27| 3페이지| 2,000원| 조회(490)

일반화학실험, 성균관대, Solubility of Potass, 질산칼륨 용해..

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일반화학실험 Redox Titration-Potassium Permanganate Method(산화환원적정) 예비/결과보고서

1. Purpose • To determine the concentration of hydrogen peroxide using redox between potassium permanganate and hydrogen peroxide. • Key concepts - Redox - Oxidizing agent - Reducing agent - Titration2. Theory • Concepts of key words ‣ Redox : It describes all chemical reactions in which atoms have their oxidation number (oxidation state) changed. ‣ Oxidizing agent : - a chemical compound that readily transfers oxygen atoms - a substance that gains electrons in a redox chemical reaction ‣ Reducing agent : It is the element or compound in a redox (reduction-oxidation) reaction (see electrochemistry) that reduces another species. ‣ Titration : It is a common laboratory method of quantitative chemical analysis that is used to determine the unknown concentration of a known reactant. • Oxidation : Reductant → Product + e- - The loss of electrons or hydrogen - The gain of oxygen - The increase in oxidation state by a molecule, atom or ion • Reduction : Oxidant + e- → Product - The gain of electrons or hydrogen - The loss of oxygen - The decrease in oxidation state by a molecule, atom or ion • Example

자연과학| 2013.05.27| 2페이지| 2,000원| 조회(267)

일반화학실험, 산화환원적정, 성균관대, Redox Titration-Pota

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일반화학실험 Enthalpy Measurement(엔탈피 측정) 예비/결과보고서

1. Purpose • To measure the enthalpies of neutralization for several acid-base reactions. • Key concepts -Enthalpy -State functions -Hess`s Law -Specific heat capacity2. Theory • Concepts of key words ‣ Enthalpy : - A thermodynamic property of a thermodynamic system. - Enthalpy is an example of a state function. - Regardless of the path of change, the heat of the reaction is always certain. - Change in enthalpy is measured where there is a non-constant volume, but constant pressure. ‣ State functions : State functions are properties of a system that depend on the state of the system and are independent of the pathway by which the system came to be in that state. ‣ Hess`s Law : - Regardless of the path of change, the heat of a reaction is always certain. - The enthalpy change for a reaction is the same whether it takes place in one big step or in many small ones.

자연과학| 2013.05.27| 3페이지| 2,000원| 조회(135)

일반화학실험, 성균관대, 엔탈피 측정, Enthalpy Measurement

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일반화학실험 Chromatography(크로마토그래피) 예비/결과보고서

1. Purpose • Learning the basic principle of chromatography (used to determine the makeup of a mixed solution) and the concept of polarity through the separation of pigments using normal and reversed-phase chromatography. • Key concepts - Chromatography • Partition Chromatography • Thin-Layer Chromatography • Normal-Phase Chromatography • Reversed-Phase Chromatography - Polarity - Electronegativity2. Theory ◇ Concepts of key words - Chromatography : The collective term for a set of laboratory techniques for the separation of mixtures - Polarity : It refers to a separation of electric charge leading to a molecule having an electric dipole - Electronegativity : It is a chemical property that describes the ability of an atom (or, more rarely, a functional group) to attract electrons(or electron density) towards itself. ◇ Stages of Chromatography- Stationary Phase: the substance is fixed in place for the chromatography procedure- Mobile Phase:the phase where the substance moves in a definite direction

자연과학| 2013.05.27| 3페이지| 2,000원| 조회(187)

크로마토그래피, Chromatography, 일반화학실험, 성균관대

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일반화학실험 Determining Avogadros Number(아보가드로수 결정) 예비/결과보고서

1. purpose • To derive Avogadro`s number (the number of molecules in a mole of a substance), using an oil layer on water. • The point concepts : Avogadro`s number, mole, monolayer • Related concepts : molar mass, polar molecule, non-polar, molecule2. Theory • Avogadro`s number, = 6.022×1023)/ mole The number of atoms in exactly 12 grams of carbon-12 ( : volume of carbon atom 1 mole : volume of 1 carbon atom) • mole A chemical unit for the amount of substance. The number is set to Avogadro`s number • Polar molecule and non-polar molecule Molecules are made up of atoms which do not always share electrons equally. When the atoms share electrons unequally, an asymmetry in molecular charge results -> polar molecule When they share equally symmetry is achieved -> non-polar molecule

자연과학| 2013.05.27| 3페이지| 2,000원| 조회(272)

일반화학실험, 성균관대, 아보가드로 수 결정, Determining Avoga..

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