Lithium‚Sodium‚Potassium‚Rubidium‚Caesium and Francium are all part of group 1.They are metals that can be easily cut.After being cut‚it is shiny but it quickly tarnishes due to the fact that the metal reacts quickly with oxygen or water.The shiny surfaces of Sodium quickly tarnishes more quickly than Lithium and Potassium more tarnishes more quickly than Lithium.This shows that the reactivity increases as we move down the group. Figure 1 Elements Melting point Boiling point Thermal
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Light and Dark Minerals Compare and contrast Essay. Have you ever wondered about light and dark minerals? Although they’re different from each other‚ they are alike in many ways. Dark and light minerals do have similarities like the eight elements. These two minerals helped form rocks in today’s society. Dark minerals are different from light minerals because of the colors. These minerals are Pyroxene‚ Amphibole‚ Olivine‚ Calcium Feldspar and Iron. The dark minerals form dark colored rocks
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2. Element X melts in boiling water‚ it fails to react with hydrochloric acid; and 1 cm3 of element X has a mass of 1.8 grams. Is element X a metal or non-metal? Give the reasons for your answer. Element X is most likely a typical non-metal. First of all‚ element X melts in boiling water; non-metals typically have low melting and boiling points. Furthermore‚ element X is unable to react with hydrochloric acid. This greatly indicates that element X is a non-metal as most non-metals fail to
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I think that we should and should not mine minerals.We should because it gives resources.We shouldn’t because we lack trained people and fuel. We can mine and find many resources.For example‚ minerals. The minerals we can find can be worth millions of dollars.We can fine minerals like silver‚gold‚copper‚lead‚tin‚and zinc.We can also use these to create thing not just for money. We can mine and find another resource.This resource is fuel.This is what we use to drive cars.The fuel could also
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DENTAL CEMENTS | BY ROBIN LAMBERT | DENTAL MATERIALS/ ANDREA BEAN | Wednesday‚ February 22‚ 2012 | DENTAL CEMENTS Dental cements have a variety of uses and properties‚ upon which the American Dental Association and International Standards Organization have classified them. Type I cements are considered luting agents‚ which hold a cast restoration (such as a crown‚ bridge or veneer) to a tooth. Type II cements are used to restore teeth. Type III cements--called liners and bases--are placed
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Five forces Analysis of Crown Cork& Seal in 1989 Part1. Competition analysis of metal container industry Bargaining power of suppliers 1. There are only three major aluminum suppliers‚ Alcan Aluminum‚ Alcoa‚ Reynolds Metal. They have obtained strong power by dominating and controlling the primary aluminum and aluminum production market. They are more concentrated than metal container industry. 2. These aluminum producers control huge aluminum resource so that the can manufacturer
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Rotary kiln is refers to rotating calcining kiln (also known as rotating kiln)‚ which belongs to thermal equipment. Rotary kiln can be divided into metallurgy kiln‚ chemical engineering kiln‚ and building material kiln according to its different dealing materials. The building material kiln is mainly used in calcining clinker cement‚ limestone and porcelain granule. Metallurgy rotary kiln is mainly used for the magnetizing calcining of lean iron ore in iron and steel plant in metallurgy industry
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Thermal stresses‚ Bars subjected to tension and Compression Compound bar: In certain application it is necessary to use a combination of elements or bars made from different materials‚ each material performing a different function. In over head electric cables or Transmission Lines for example it is often convenient to carry the current in a set of copper wires surrounding steel wires. The later being designed to support the weight of the cable over large spans. Such a combination of materials
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ANTACIDS- Classification and Mechanism of Action INTRODUCTION Antacids are defined as a substance‚ generally a base‚ which counteracts stomach acidity. The name antacid means anti-acid (against acid). Antacids are the primary treatment for ailments such as gastric reflux‚ gastritis‚ upset stomach and heartburn. Hydrochloric acid is secreted by the stomach to kill harmful organisms‚ aid digestion and activate digestive enzymes. Excess secretion of acid into stomach or impaired resistance by
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The Feasibility of Using Plastic and Glass to Produce an Earthquake Resistant and Fire Retardant Hollow Block Chapter 1 Introduction: Most people believed that plastics and glass are one of the main wastes every day‚ but they don’t know that these wastes may help lessen the damages of different catastrophes specifically earthquakes and fires through a hollow block that used in building infrastructures. What is the difference between a commercial cement block to a hollow block mainly composed
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