Cooke) found that these types of chemical relationships extended beyond the triad. During this time fluorine was added to the halogen group; oxygen‚ sulphur‚ selenium and tellurium were grouped into a family while nitrogen‚ phosphorus‚ arsenic‚ antimony‚ and bismuth were classified as another. Unfortunately‚ research in this area was hampered by the fact that accurate values of were not always available. In 1862‚ French geologist Alexandre-Emile Béguyer de Chancourtois listed the elements on
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affect the nervous and hormonal system and cause allergy and irritation around the lips. Another commonly found metal is aluminum‚ which can cause anemia and glucose intolerance. Some other harmful products found in lipsticks are mercury‚ cadmium‚ antimony and formaldehyde. Also lipstick pigments contain chemicals that can cause your lips to blacken or a condition called Leucoderma‚ also known as vitiligo. Leucoderma in layman’s terms can be explained as white spots or patches on the skin. Famous Canadian
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GUIDELINES FOR ENVIRONMENTALLY SOUND MANAGEMENT OF E-WASTE (As approved vide MoEF letter No. 23-23/2007-HSMD dt. March 12‚ 2008) MINISTRY OF ENVIRONMENT & FORESTS CENTRAL POLLUTION CONTROL BOARD Delhi MARCH‚ 2008 TABLE OF CONTENTS EXECUTIVE SUMMARY Chapter 1 INTRODUCTION 1.0 Preamble 01 1.1 E-Waste 01 1.2 Environmentally Sound Management of E-waste 01 Chapter 2 OBJECTIVE & SCOPE OF THE GUIDELINES 2.1 Objective 02 2.2 Scope 02
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Resources are defined as a means of meeting a need‚ particularly an economic or social need‚ of the people. The term usually refers to natural resources like land‚ water‚ air. Natural resources are largely unchanged materials of the land that are valuable to people and used in variety of ways. Pakistan is rich in natural resources. It has mountains‚ plains‚ deserts‚ fertile soils‚ rivers and oceans. Natural Resources are very important for the development and prosperity of a country. The important
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Chemistry and Matter Rich McConnell‚ CH-201 Grantham University Chemistry and Matter 1. A scientist who is trying to make an insecticide that is more toxic to mosquitoes than to humans would be involved in ________. 1. Basic research 2. Applied research 3. Technology 4. Serendipity 2. How is chemistry defined? Science can be looked at like at tree‚ within this tree there are different branches one of which is Chemistry which studies composition and properties of matter and the changes they go through
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is a member of a loosely-defined subset of elements that exhibit metallic properties. Heavy metals are simply a certain class of metallic elements. Some heavy metals that we have mentioned in this report are Lead‚ Mercury‚ Arsenic‚ Copper‚ Iron‚ Antimony‚ Barium‚ Cadmium‚ and Thallium. Among the mentioned heavy metals‚ we have discussed about Arsenic‚ Lead‚ and Mercury widely regarding their contamination and their effects. We have also discussed about their sources in the river water Then‚ we have
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conductivity of a semiconductor by adding tiny impurities to the crystal lattice. A very small proportional of silicon atoms are replaced with atoms of other elements. Two way of doping. N-type semiconductor Use atoms with five outer electrons (antimony‚ arsenic or phosphorus). While four of these outer electrons fit into the crystalline structure‚ the fifth does not‚ and is free to move. The negatived charged electron is about to move. The semiconductor doped in this way is still electrically neutral
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9.1 Manufacture of Sulphuric Acid 1. State uses of sulphuric acid in daily life. - lead acid batteries in automobiles and for home use - extraction of elements from ores - manufacturing of fertilizers 2.The following shows an incomplete flow chart of the Contact process. a) b)Chemical equation A. B. C. D. 3. Briefly explain the sources of sulphuric dioxide gas in atmosphere. -Sulphur dioxide is produced mainly from the combustion of fossil fuels
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cosmetic materials like henna‚ ritha‚ sekakai (for washing hair)‚ Mutlani clay‚ Beri ke patte (plum leaves) Mash ki Dal (black lentil) hair-oils‚ gewari (aloe vera) arq-e-gulab (rose water) olive and almond oil‚ sandalwood‚ ubtan‚ kajal (kohl) surma (antimony) and many such materials have been in use by women since may centuries and are still in vogue. Very gradually cosmetic business grew up and though many of the basic materials used by Cleopatra were still employed‚ they were used with added skill
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1. Physical Properties of Water and Ice 1. Molecular Weight: A. 18.01528 g/mol Water‚ Molar mass Triple Point The temperature and pressure at which solid‚ liquid‚ and gaseous water coexist in equilibrium is called the triple point of water. This point is used to define the units of temperature (the kelvin‚ the SI unit of thermodynamic temperature and‚ indirectly‚ the degree Celsius and even the degree Fahrenheit). As a consequence‚ water’s triple point temperature is a prescribed value rather
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