Chemistry - Module 2 - Metal 1. Metals have been extracted and used for many thousands of years * Outline and examine some uses of different metals through history‚ including contemporary uses‚ as uncombined metals or as alloys. Contemporary Uses of common metals Metal | Uses | Iron and Steel (an alloy with <2% carbon)Good tensile strength‚ cheap‚ rusts (corrodes) | - Railways‚ bridges‚ buildings- motor cars bodies‚ ships and trains- Engine blocks‚ fire hydrants‚ drainage
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1121 theory Topic 1 BDA/inventory * Time period assumptions: firm would find it desirable to report their financial statements more frequently therefore the economic life could be divided into artificial time periods. * Why are adjusting entries required? The purpose of balance day adjustment is to recognise revenue and expenses in the relevant Period. * Compare and contrast the purposes of adjusting entries‚ closing entries and reversing entries The purpose of closing entry is
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Oxidation & Reduction I. Metal-Metal Ion Displacement II. Halogen Displacement Reactions INTRODUCTION A series of experiments had been conducted to determine the order of displacement strengths of the metals and halogen chosen for the experiments. A displacement reaction is a reaction in which one element(metal or non-metal) displaces another element(metal or non-metal) from its salt solution. In the displacement reaction of metals‚ the more electropositive metal will displace the less
Free Oxidizing agent Chlorine Hydrogen
extract a metal Industrial mineral- either has some direct practical use‚ or take part in some industrial process Gems and precious stones are an exception to industrial metals as they do have a direct ‘practical’ application but are dealt with separately. Some common minerals include: * * Silica- (silicon dioxide) most common mineral on earth * Calcite- (calcium carbonate) main mineral in limestone and marble Ore: A naturally occurring solid material from which a metal or valuable
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Lignite Bituminous(the common variety of coal)-grey black Anthracite(best variety of coal)hard coal % of carbon content 50-60 Uses 60-70 70-80 In thermal power plants Household fuel 90-95 As a reducing agent for the extraction of metals. The different varieties of coal formed depend on how long and at what temperature and pressure the coal is buried under the surface of the earth. Peat is the most inferior quality coal and anthracite the most superior quality coal. Bituminous
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Running Head: BASIC FAMILY SYSTEMS THEORY AND MICROSKILLS Basic Family Systems Theory and Microskills Used by the Helper Basic Family Systems Theory and Microskills Used by the Helper In terms of a system‚ the meaning is a consistent arrangement of things connected to form unity or to operate as a whole. These systems are dated back in origins to the 1950’s and 1960’s. In this theory we must understand an individual’s family and how it works for that family daily in the community‚ neighborhood
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MATERIALS : METALS AND NON-METALS Y Iron Coal ou are familiar with a number of materials like iron‚ aluminium‚ copper‚ etc. Some materials have been given in Table 4.1. Table 4.1 : Appearance and Hardness of materials Object /Material Appearance Hardness (Shiny/Dull) (Very hard/ Not very hard) similar change if we try to beat a wood log ? Let us find out. Activity 4.1 Take a small iron nail‚ a coal piece‚ a piece of thick aluminium wire and a pencil lead. Beat the iron nail with
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Basic Concepts in Attachment Theory Attachment theory is the joint work of John Bowlby and Mary Ainsworth (Ainsworth & Bowlby‚ 1991 ). Drawing on concepts from ethology‚ cybernetics‚ information processing‚ developmental psychology‚ and psychoanalysts‚ John Bowlby formulated the basic tenets of the theory. He thereby revolutionized our thinking about a child’s tie to the mother and its disruption through separation‚ deprivation‚ and bereavement. Mary Ainsworth’s innovative methodology not only
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Metals & Non-Metals Metals: Good conductors of heat and electricity. Have shining luster. Malleable (this means that they can be hammered or distorted). Ductile (this means that they can be drawn into wires). Most have high melting and boiling points. Are sonorous (give out sound when beaten). Usually solid at room temperature. An exception to this is mercury‚ which is liquid in nature. Examples: Aluminum‚ Gold‚ Copper‚ Silver‚ Sodium‚ Potassium‚ Mercury. Corrode or oxidize in
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Coursework 4 According to Tuckman and Jensen (1977)‚ there are five stages of group development. The five stages are “forming”‚ “storming”‚ “norming”‚ “performing”‚ and “adjourning”. Forming is when everyone is instructed to group together for a particular purpose and understand the task to be accomplished but there are sceptical between each other. This is the period of "testing-out" our group members. Storming is where some minor confrontations will arise that is quickly dealt with
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