SUPPLEMENTARY MATERIAL I Unit V: States of Matter 5.7 KINETIC ENERGY AND MOLECULAR SPEEDS Molecules of gases remain in continuous motion. While moving they collide with each other and with the walls of the container. This results in change of their speed and redistribution of energy. So the speed and energy of all the molecules of the gas at any instant are not the same. Thus‚ we can obtain only average value of speed of molecules. If there are n number of molecules in a sample and their individual
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Module 4: 10. Strong Bases: NaOH‚ KOH‚ Na2CO3‚ NaHCO3‚ Na3PO4‚ NaHPO4‚ Strong Acids: Fe(NO3)3‚ HCL‚ HNO3‚ Al(NO3)3‚ NiCl2‚ H2SO4 11. Acidic Neutral Basic NaCl KNO3 NaOH HC2H3O2 Na2CO3 NaC2H3O2 NaHCO3 Fe(NO3)3 NaNO3 Na3PO4 HCl MgSO4 KOH HNO3 Na2SO4 NaHPO4 CuSO4 NaNO2 CoCl2 Al(NO3)3 NiCl2 H2SO4 KCl NH4Cl 12. CuSO4 CuCO3.Cu(OH)2(s) + 2 H2SO4(aq) ----> 2 CuSO4(aq) + CO2(g) + 3 H2O(l) Na3PO4 Na3PO4 (aq) + 3H2O (l) --> H3PO4 (aq) + 3NaOH
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I. Introduction A buffer system is a mixture of a weak acid or a weak base and its salt (conjugate base or conjugate acid‚ respectively) that permits solutions to resist large changes in pH upon the addition of small amounts of hydrogen ions (H+) or hydroxide ions (OH-). If the same amount of the buffer is added‚ the pH may only change a fraction of a unit. Our blood is a good example of a buffered system. It is maintained under a pH of 7.4. Thus‚ buffers are important in many areas of chemistry
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Experiment 1: "A cis to trans conversion" Saturday‚ June 25‚ 2005 4:19 PM Notes on Theory • Alkenes o They are hydrocarbons with a C=C double bond • Double bonds are stronger and more reactive than single bonds o Hydrocarbons with double bonds used to be known as "olefins"‚ because they had an oily appearance • "Oleum" means oil • "Ficare" means make • Isomers o Geometric isomers have the same molecular formula‚ but a different geometric arrangement • They also have different physical properties
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adding strong acids or bases to buffer solutions especially that of the body. Part A determines the effect of common ions to the extent to ionization wherein certain reagents were mixed with water in one test tube and a solution with a common ion in another. Part B determines which solutions exhibit buffer effect wherein certain reagents were mixed and is tested with a pH meter. Part C determines the effect of common ion on the solubility of slightly soluble salts wherein benzoic acid is dissolved
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1874‚ Dresden‚ Germany- Salicylic acid was first made and sold as a pain-killer‚ but it caused severe irritation of the mouth‚ gullet and the lining of the stomach. Salicylic acid (2-Hydroxybenzoic acid) 1875- Chemists made sodium salicylate for doctors to try on patients. It was found to have fewer
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expect for a 1.50 cm3 sample of pure tin? About 6.7 g c. What mass would you expect for a 0.20 cm3 sample of pure tin? About 1.3 g Logger Pro graph. 2. Students calculate the rate of reaction using several different concentrations of acid. When the rates are reported in scientific notation it is important to make sure that all the values on the rate axis are report to the same power of ten. You may have to make all the values times ten to the fourth power to draw this graph. Don’t connect
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Research Question: To investigate how varying the pH of bromothymol blue affects the absorbance value of the solution which determines the equilibrium constant (pKa) of the indicator. Variables: Variables Variables Measured Method of measurement Independent pH of the six buffer solution A pH probe attached to a data-logger will be used to measure pH Dependent Absorption of the buffer solutions at wavelength 435.0nm and 617.0 nm A spectrophotometer (±0.001) will be used to measure absorbance
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4? Explain how the data supports the role of a buffer. C. Explain how the data from Tables 1 and 2 are similar and different from the data in Tables 3 and 4. What does this indicate about a buffers ability to maintain pH when an acid or a base is added? D. What do the data in Tables 5 and 6 show about the ability of water to behave as a buffer? Considering the definition
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Determination of pKa James McDuffie ABSTRACT: In this lab‚ the pKa of unknown solution #4 was measured Introduction: This lab focused on the equilibrium constant‚ Ka. Ka is associated with chemical properties of acids. The equivalence point will be reached once the moles of OH- equal the moles of HA and once this point is reached‚ the PH changes very quickly. With the results‚ a titration curve should be produced. Experimental Section Materials and Methods: A buret with NaOH solution
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