DELHI PUBLIC SCHOOL DAGAPUR ‚ SILIGURI (Affiliated to C.B.S.E.) Session :- 2012-13 Topic : Study of effect of Potassium bisulphite as a food preservative Submitted To: Submitted By: Mr. B.GHOSH H.O.D. Chemistry 12th Science Roll no. = Certificate This is to certify that s/o Mr. Amar Singh is a bonafide student of class XIIth Science during session 2012-2013. He has completed his project on Study of effect of Potassium bisulphite
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Supercritical Carbon Dioxide as a Green Solvent Gregory Absillis June 2009 The majority of chemical processes in chemical synthesis are carried out in solution and organic solvents usually are the first choice. To satisfy this demand‚ 15 billion kilograms of organic are produced worldwide each year. [1] These solvents often bear considerable risk due to their toxicity‚ flammability or environmental hazards. Furthermore‚ they have to be separated from the products and recycled or disposed at
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Cbse-spot.blogspot.com 1 Class IX Chapter 15 – Probability Maths Exercise 15.1 Question 1: In a cricket math‚ a batswoman hits a boundary 6 times out of 30 balls she plays. Find the probability that she did not hit a boundary. Answer: Number of times the batswoman hits a boundary = 6 Total number of balls played = 30 Number of times that the batswoman does not hit a boundary = 30 − 6 = 24 Question 2: 1500 families with 2 children were selected randomly‚ and the following data were
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baking soda hit the vinegar and lemon juice‚ the balloon started to expand.Adding the lemon juice to the baking soda creates a chemical reaction. The baking soda is a base‚ while the lemon juice is an acid‚ when the two combine they create carbon dioxide (CO2). The gas rises up and escapes through the soft drink bottle‚ it doesn’t however escape the balloon‚ pushing it outwards and blowing it up. What happen when I tested the experiment was me and my mommy had test it out and I found that two of
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to handle and store‚ but if it is mixed with an acid‚ a reaction happens. When dilute sodium thiosulfate is mixed with an acid‚ solid sulphur is made‚ which makes the solution appear cloudy. The reaction also makes small amounts of toxic sulphur dioxide gas. You will choose one factor and investigate this factor’s effect on the rate of reaction between sodium thiosulfate and dilute hydrochloric acid. A colorimeter is a device used in colorimetry that generally refers to the device that measures
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Date Instructor Axia College Material Appendix L Air Pollution Chart After reviewing Ch. 8 and 9 of your text‚ complete the following table‚ then respond to the questions that follow: Issue Sources Health/Environmental Effects Carbon dioxide (CO ) Industries and Motor Reduces your bloods ability to move oxygen 2 Vehicles. throughout your body. Lower levels can cause fatigue and headaches. High levels cause death and mental impairment. Chlorofluorocarbons (CFCs) Propellants in
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recognizes sulfur as a contributor to the acid rain problem and enacted a goal to reduce total national sulfur dioxide emissions to half of 1990 levels. The Act describes the cap and trade approach whereby companies are permitted to pollute a certain amount of sulfur dioxide compared to levels of electricity output they produce. Rainwater is naturally acidic with a pH of around 5.7. Acid rain can be defined by anthropogenic acidification caused by nitrogen compounds and sulfur dioxide‚ formed
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Sulfur Physical and chemical properties: Sulfur is classified as an odourless‚ tasteless‚ soft‚ light yellow solid. It is insoluble in water‚ but is soluble in carbon disulfide. Sulfur is very reactive; it reacts with all metals except gold and platnium‚ forming sulfides. It also forms compounds with various non-metallic elements. Sulfur forms over 30 solid allotropes. Sulfur is a chalogen (group 16 of the periodic table) and a non metal. Sulfur’s atomic weight is 32.06. It has 16 electrons‚ protons
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Harvard Business School 9-792-060 Rev. April 28‚ 1993 Acid Rain: The Southern Company (A) Early in 1992‚ managers at the Southern Company were reexamining their strategy for complying with the acid rain provisions of the 1990 amendments to the Clean Air Act. The Southern Company was a holding company; its operating units were electric utilities in Georgia‚ Alabama‚ Mississippi‚ and Florida. The largest Southern subsidiaries‚ Georgia Power and Alabama Power‚ provided most of the electricity
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ash‚ which can be used to great effect in the concrete industry. These tiny particles contain not only carbon residue‚ but also silicon dioxide‚ calcium oxide and traces of heavy metals. If inhaled these can pose significant health risks. The silicon dioxide in the fly ash alone can cause lesions‚ scarring and inflammation of the lungs. 2) Sulfur Dioxide. Sulfur
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