Chemical Reactions and Equations Chemical Reaction: The transformation of chemical substance into another chemical substance is known as Chemical Reaction. For example: rusting of iron‚ setting of milk into curd‚ digestion of food‚ respiration‚ etc. In chemical reaction new substance is formed which is completely different in properties from the original substance‚ so in a chemical reaction chemical change takes place. Following are the signs of chemical reaction: (a) Change of state of substance
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IGCSE Complete Chemistry Notes Unit 1: States of matter Everything is made of particles. Particles in solid are not free to move around. Liquids and gases can. As particles move they collide with each other and bounce off in all directions. This is called random motion. In 2 substances‚ when mixed‚ particles bounce off in all directions when they collide. This mixing process is called diffusion. It’s also the movement of particles without a force. The smallest particle
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recovered as fuel for boilers and kilns. There are many different chemical substances emit by industrial activities that contribute to air pollution. These chemicals come from a variety of sources. Among the many types of air pollutants are nitrogen oxides‚ carbon monoxides‚ and organic compounds that can evaporate and enter the atmosphere. Air pollutants have sources that are both natural and human. Now‚ humans contribute substantially more to the air pollution problem. The effects of air pollution
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ical Chemistry 1.which of the following pairs of compound will react? iC3H6+Br2 iiC3H6+Cl2 in sunlight iiiC3H6+H2O in the presence of sulphuric acid ivC3H6+H2O in the presence of concentrated sulphuric acid a.i b.i‚iii c.i‚ii‚iii d.all 2.liqiud y reacts with magnesium metal to produce a gas that burns with a pop sound when a flaming wooden splint is placed near it.liqiud y is most likely a compound that has the formula a.c2h5oh b.hcooh c.h3cooch3 d.c6h14 3.a compound p has the
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classification of pollutants under the traditional policy field Air Pollution: the acidification of soil and water by pollutants such as sulphur oxides‚ nitrogen oxides and ammonia; the damage to buildings sensitive to the same acidifying substances; the formation of tropospheric ozone from so-called ozone precursors‚ e.g. volatile organic compounds‚ nitrogen oxides and carbon monoxide which indirectly affect human and animal health and vegetation; direct effects on human health and ecosystems e.g.
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looks at the relationship between emissions from the jets and the global change. In the last part of this paper‚ it looks at the role played by the emissions from ships and the relationship between the emissions and the deposition of acidic sulphur oxides. The examples that get to be discussed in this level get to be considered with a degree of uncertainty since the three sectors of the economy are dynamic in nature. The paper focuses on the steps that the stakeholders in the environmental conservation
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General introduction‚ electronic configuration‚ occurrence‚ oxidation states‚ trends in physical and chemical properties; nitrogen - preparation‚ properties and uses; compounds of nitrogen: preparation and properties of ammonia and nitric acid‚ oxides of nitrogen (structure only); Phosphorous-allotropic forms; compounds .of phosphorous: preparation and properties of Phosphine‚ halides (PCl3‚ PCl5) and oxoacids (elementary idea only) Group 16 elements: |Symbol |Atomic |Electronic configuration
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Multigate transistors as the future of classical metal–oxide–semiconductor field-effect transistors Isabelle Ferain1‚ Cynthia A. Colinge1 & Jean-Pierre Colinge1 For more than four decades‚ transistors have been shrinking exponentially in size‚ and therefore the number of transistors in a single microelectronic chip has been increasing exponentially. Such an increase in packing density was made possible by continually shrinking the metal–oxide–semiconductor field-effect transistor (MOSFET). In
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which releases more sulfur dioxide than all of the world’s cars‚ trucks and buses combined. The most cost effective and simplest solution to this problem is to have shipping companies start using altered bunker fuel which will reduce the nitrogen-oxide emissions effectively reducing air pollution and having the quickest positive impact on the environment. It has been proven that companies that have developed a Corporate Social Responsibility program are more profitable than those who don’t have
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TITLE : The copper cycle IN TRODUCTION The purpose of the experiment is to recognize that change of state‚ change in colour‚ formation of a precipitate‚ or the evolution of heat are associated with a chemical change; to study reactions of copper. Copper is an element that can be found in nature in a variety of different compounds. The most common natural ore is the sulphide‚ known as chalcocite‚ Cu2S. This mineral is an important source of copper metal because it is about 80% copper by
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