DETERMINATION OF VITAMIN C CONTENT IN COMMERCIAL (CENOVIS) TABLET ABSTRACT In this experiment‚ the vitamin C content of a commercial tablet is determined and compared with the manufacturers’ specification. Vitamin C is water-soluble and is an enantiomer of ascorbic acid. (Commercial vitamin C is often a mixture of ascorbic acid and other ascorbates.) Ascorbic acid‚ C6H8O6‚ is a reducing agent that reacts rapidly with iodine (I2). As the iodine is added during the titration‚ the ascorbic acid is
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Cooling towers are a very important part of many chemical plants. They represent a relatively inexpensive and dependable means of removing low grade heat from cooling water. The make-up water source is used to replenish water lost to evaporation. Hot water from heat exchangers is sent to the cooling tower. The water exits the cooling tower and is sent back to the exchangers or to other units for further cooling. [pic] Types of Cooling Towers |[pic]
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SPM CHEMISTRY REVISION MODULE FOR THE MASTERY OF THE BASICS IN SPM CHEMISTRY Panel : 1. 2. 3. 4. June Ling S J Chen Soo Chien Felix Ngui Jong Kah Yin SMK St Joseph‚ Kuching Kolej DPAH Abdilah‚ Kuching SMK Tabuan Jaya‚ Kuching SM Sains Kuching REVISION MODULE FOR THE MASTERY OF THE BASICS IN SPM CHEMISTRY Page Compiled and edited by : Jong Kah Yin 1 SPM CHEMISTRY INDEX CONTENT 1 REVISION CHECK-LIST Form 4 Form 5 2 WRITING EQUATIONS 2.1 Charges of ions 2.2 Formulae of compounds
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The saturated unbranched alkenes will have a much quicker reaction rate but have low enthalpy values as it doesn’t take that much energy to break those bonds. Due to the neo-pentane having the larger density out of the other two isomers of pentane‚ it will have the lowest enthalpy value but the fastest reaction rate. Meaning that iso-pentane for higher concentrations will have high enthalpy values due to the trends in the graph meaning that it will produce the biggest flames out of the
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Assess the use of neutralization reactions to minimize damage in accidents or chemicals Look at relationships and the Weigh up two different situations (positives and negatives) Use of neutralization vs other methods such as copius amounts of water Positive effects of using neutralization vs negative effects Positive effects of using alternative methods versis negative effects Finally state your judgement or conclusion A neutralisation reaction is an exothermic chemical reaction involving
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M12/4/CHEMI/SP2/ENG/TZ1/XX/M MARKSCHEME May 2012 CHEMISTRY Standard Level Paper 2 13 pages –2– M12/4/CHEMI/SP2/ENG/TZ1/XX/M This markscheme is confidential and for the exclusive use of examiners in this examination session. It is the property of the International Baccalaureate and must not be reproduced or distributed to any other person without the authorization of IB Cardiff. –3– M12/4/CHEMI/SP2/ENG/TZ1/XX/M General Marking Instructions Assistant Examiners (AEs) will be contacted by
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learning criminal behavior occurs within intimate groups based on the degree of intensity‚ frequency‚ and duration. 8. What do Sykes and Matza mean by techniques of neutralization? Gresham Sykes and David Matza (1957) refer to a social psychological mechanism-- neutralization- that permits a delinquent to accept the social norms of the wider society and‚ at the same time‚ violate these
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Chemistry Investigation 14: ------------------------------------------------- To determine the enthalpy change of reaction for: ------------------------------------------------- Na2CO3(aq) + H2O(l) + CO2(g) → 2NaHCO3(aq) Given: S1— Anhydrous sodium carbonate (Na2CO3) S2— Anhydrous sodium hydrogen carbonate (NaHCO3) A1—Aqueous sulfuric acid (H2SO4)‚ 0.500mol dm-3 Apparatus | Uncertainty | Measuring cylinder | ± 0.5 ml | Electronic Balance | ± 0.001 g | Data logger | ±0.2 ℃ |
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Thermodynamics- Enthalpy of Reaction and Hess’s Law Objectives: 1. To calculate the heat of reaction of a given reaction using the concepts derived from Hess’s Law. Pre-lab Questions: 1. Define Heat of Reaction. The enthalpy change associated with the completion of a chemical reaction. 2. Define Specific Heat. The energy it takes to raise the temperature of 1 gram of a substance by one degree Celsius. 3. Calculate the heat of reaction assuming no heat is lost to the calorimeter. Use correct
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Sodium acetate is a salt formed by the neutralization between a weak acid and a strong base. The resulting salt is slightly is basic‚ and when it’s dissolved in the water‚ hydrolysis occurs. Water is more occupied with OH-‚ hence the solution is basic. But in ammonium chloride‚ a salt formed by the neutralization between strong acid and relatively weaker base‚ more H+ ions are produced and the solution becomes acidic. Also
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