Redox Problem Set 1: Reactions and Stoichiometry (All of these questions are no calculator friendly) 1) Give the oxidation number of carbon in each of the following: a) b) c) d) CF2Cl2 Na2C2O4 HCO3-1 C2H6 2) Give the oxidation number of sulphur in each of the following: a) b) c) d) SOCl2 H2S2 H2SO3 Na2S 3) Identify the oxidizing and reducing agents in each of the following: a) b) c) d) 8H+(aq) + 6Cl-1(aq) + Sn(s) + 4NO3-1(aq) SnCl6 -2(aq) + 4NO2(g) + 4H2O(l) 2MnO4-1(aq) + 10Cl-1(aq) + 16H+(aq)
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Test: Procedure Instead of the Biuret Reagent‚ the following may be used: * Fehling’s Solutions A and B * Sodium hydroxide and copper (II) sulphate solutions 1. Add 2 cm3 of the liquid food sample* to a clean‚ dry test tube 2. Add 2 cm3 of Biuret Reagent. Alternatively: * Use sodium hydroxide solution and copper sulphate solution instead. Add 1 cm3 of sodium hydroxide solution (40% or bench solution) and 1% copper (II) sulphate solution dropwise – drop by drop - to the food
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chemical compounds also known as electrolysis. Therefore leaving us sodium‚ chlorine gas‚ hydrogen gas and oxygen gas. If you are wondering where I got this from here’s how: Salt is NaCl which is Sodium Chloride separate that and you get sodium and chlorine gas. Water is H20 which is Dihydrogen Monoxide (2 part hydrogen and one part oxygen) sepaprate that and you get hydrogen gas and oxygen gas. Anyway‚ hydrogen gas and sodium are both positive ions (atoms)‚ because opposites attract both of
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS General Certificate of Education Advanced Subsidiary Level and Advanced Level CHEMISTRY Paper 1 Multiple Choice Additional Materials: Multiple Choice Answer Sheet Soft clean eraser Soft pencil (type B or HB is recommended) Data Booklet 9701/11 May/June 2012 1 hour *6083199800* READ THESE INSTRUCTIONS FIRST Write in soft pencil. Do not use staples‚ paper clips‚ highlighters‚ glue or correction fluid. Write your name‚ Centre number and
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F> GUIDELINES FOR THE COLLECTION‚ CARE AND CONTROL OF RAINWATER IN TANKS F A C T S H E E T Rainwater tanks can provide a supply of good quality potable water with proper management of the tank and roof catchment. The Tank & Reduction of Water Consumption Tanks are available in galvanised steel‚ zincalume‚ fibreglass and concrete and all are suitable for the storage of potable water. Rainwater tanks should protect water from contamination. Contaminants such as industrial pollutants‚ dust
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CH3(CH2)4CH=CHCH2CH=CH(CH2)7COOH Structure II CH3CH2CH=CHCH2CH=CHCH2CH=CH(CH2)7COOH (i) In an experiment‚ hot acidified potassium manganate(VII) was used to oxidise Structure I. Write the structural formulae of all organic products formed during the oxidation. (ii) What is meant by the term cis-trans isomerism? How many cis-trans isomers are present in Structure I? Draw any 2 possible cis-trans isomers. (iii) State the physical state of this lipid at room temperature. Explain your answer. [9]
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This inhibits spoilage of the food item by microbial growth. Preservatives may be antimicrobial preservatives‚ which inhibit the growth of bacteria or fungi‚ including mold or they can be antioxidants such as oxygen absorbers‚ which inhibit the oxidation of food constituents. Common antimicrobial preservatives include sorbic acid and its salts‚ benzoic
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fatty acids‚ phospholipids‚ pigment‚ iron and copper ions and some sulfur-containing compounds.And 0.02% ~ 0.5% of phosphoric acid in cylindrical POTS‚ 60 ~ 90 ℃ under processing 15-30 minutes‚ another amount to 1% ~ 3% of 3% ~ 8% concentration of sodium hydroxide (caustic soda) is 10 ~ 30 minutes of saponification‚ due to the saponification material than major sank into the bottom of the pot after release called soapstock;Then under 65 ℃ water or dilute acid washing twice‚ put into water‚ then under
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Date: 25 Nov‚ 2004 Objective: 1. To standardize sodium thiosulphate for titration use. 2. To find out the concentration of Vitamin C in the tablet. Theory: This experiment involves titration of redox reaction. Redox reaction means reduction and oxidation. In which oxidizing agent and reducing agent are mixed and oxidize/reduce each other. One losses electron(s) and increase in oxidation number when is oxidized‚ and vice versa. In order to find out concentration of the ascorbic acid in the tablet
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fermentation should be observed. Methods and Materials: 100ml of the stock solution of 10% glucose was placed into four separate beakers. Each beaker was labeled “1 (control)‚” “2 (5 drops)‚” “3 (10 drops)‚” and “4 (15 drops)”. Five drops of 6% sodium hypochlorite was added to beaker #2‚ 10 drops to beaker #3‚ and 15 drops to beaker #4. The contents of the yeast suspension were then stirred thoroughly to be sure the yeast cells were suspended and not settled at the bottom and to each solution 50ml of
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