involves using a nichrome wire loop to introduce a sample into a quiet blue Bunsen flame. Many cations show characteristic colours. The nichrome wire is easily contaminated and was cleaned by dipping it into concentrated hydrochloric acid and heating vigorously with a roaring Bunsen flame. The wire is clean when it gives no colour with the flame. Result of flame testing cations: |Cation Tested |Colour of Flame
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Importance of electrical services in buildings Electricity has been part of our lives. It has brought many things that surely have made many wonders and life would seem so hard without it. Electricity powers our light‚ heating‚ electronic appliances such as computers and television‚ and a host of essential services that we take for granted. However‚ electricity has much more important aspects because it is a fundamental feature of all matter. Electricity is the force that holds together the
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FREE ELECTRON THEORY Classical free electron theory of metals This theory was developed by Drude and Lorentz and hence is also known as Drude-Lorentz theory. According to this theory‚ a metal consists of electrons which are free to move about in the crystal like molecules of a gas in a container. Mutual repulsion between electrons is ignored and hence potential energy is taken as zero. Therefore the total energy of the electron is equal to its kinetic energy. Drift velocity If no electric
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force is caused by electric charge. Electric charge is a property of the bits of matter within atoms. Electric force can cause matter to attract or repel because there are two kinds of charge – positive and negative charge. The effects of electric force can be summarized as the law of electric charge: Pieces of matter with the same kind of charge repel each other. Pieces of matter with the same kind of charge attract each other. 2 objects with a positive charge repel each other‚ as do 2 objects
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1.Using computers everyday can have more ‚negative than positive effect on young children. Nowadays computer play a crucial role for young generation. Mostly children dependent on computers for multifarious purposes. But some people believe that it cause obstacle between their healthy life and in acquiring practical knowledge. Lets delve deeper into the topic to seek more clarification. Firstly and most commonly‚the advanced technology make the people more lethargic. The children spend their leisure
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Social Networking: Positive or Negative? Social networking has many opinions pointing toward it. Some may say that it is a positive influence‚ while others think negatively. There are many directions to look at it. From my perspective‚ I believe social networks have only grown to cause many issues. When reading something rather than hearing it said aloud‚ problems arise because you can ’t tell the tone of something said. Also‚ other issues deal with the fact that people can find out every detail
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negative Indira Gandhi was the most corrupt politicians of all time . Her politics was so ugly that to remain in power and stay as uncrowned queen of India she imposed emergency in 1977 . She made extreme laws such as forcible vasectomy of men ( unmarried young men included ) to control population of India . She was an awful leader and one of the biggest criminal of all times . She ate away India financially and also caused a lot of mayhem . When Sikhs opposed her regime ( in worlds largest democracy
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ELECTRICAL CONDUCTORS A conductor is an object or type of material which permits the flow of electric charges in one or more directions. For example‚ a wire is an electrical conductor that can carry electricity along its length. Physics All conductors contain electrical charges‚ which will move when an electric potential difference (measured in volts) is applied across separate points on the material. This flow of charge (measured in amperes) is what is meant by electric current. In most
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Americans today have their negative and positive sides to them. For example‚ many Americans‚ like my father‚ focus on the any positives of the people. He sees the good in everyone‚ and he is always providing sweet southern hospitality to his neighbors and community members. Another positive of Americans is the passion that every soul carries with them; Americans strong belief in freedom and justice always brings the great nation together‚ this love is so great that often times this patriotism for
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Task 2: Positive and negative influences on development In this essay I will be talking about both negative and positive factors that influence development during the different life stages. The different life stages that occur in everyone’s life are infancy‚ childhood‚ adolescence‚ younger adulthood‚ middle age adulthood‚ old age and then end of life. There are two different types of socialisation‚ these are primary and secondary. Primary socialisation comes from your family and/or carers – this
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