seventh but more impressive is their growth which is twice the overall export growth of Pakistan. Basic Chemical manufacturer may be defined as production of drugs and chemical by synthesis‚ fermentation or extraction from naturally occurring materials of biological or mineral origin. Unfortunately‚ while the pharmaceutical formulation industry has grown at a relatively rapidly pace‚ the basic chemical industry in Pakistan has lagged behind. Basic manufacturer is dependent upon a reasonably well-developed
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The Periodic Table An element is a substance that cannot be made simpler by chemical means Johann Dobereiner divided the elements into groups of three known as triads The three elements had similar chemical properties in which the atomic weight of the middle element was the average of the other two John Newlands classified the elements into groups of eight known as octaves The eight elements were ordered by increasing atomic weight The first and eighth element had similar properties
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idea that all things are elements or combinations of elements can be found in the writings of the ancient Greeks and other early peoples. Although this idea may seem simple‚ it is very difficult to decide if a substance is indeed an element or a compound. There were twelve chemical elements discovered in ancient times‚ but it was not known that they were elements. Another 76 elements were discovered between 1557 and 1925. Many mistakes were made in the discovery of the elements and the term ‘chemist’
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I did this lab to find out the differences between chemical and physical changes. I also did this lab to learn the signs that would indicate the chemical reactions and physical changes. I needed to learn the odor change‚ color change‚ bubbles or gas‚ irreversible‚ temperature changes and finger prints. By the end of the lab‚ my goal was to be able to didtinguish easily the difference between chemical and physical changes. Question #1 answer. 1. Gas. 2. Dissolved in water. 3
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Promethium‚ Pm‚ is the 61st element on the Periodic Table. It was discovered in 1945 by Jacob A. Marinsky. It’s a metal‚ and named after the Greek God Prometheus. It is not naturally occurring‚ but can survive outside of a lab. Promethium has an atomic number of 61‚ which is the number of protons. Its atomic mass‚ protons+neutrons‚ is 145u. It is an isotope. This means that it has a different number of neutrons (84) than the number of electrons and protons (61). Every element changes states of matter
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study of microbes‚ which affect almost every aspect of life on the earth. Describe how the table of elements is ordered and discuss four common elements in living organisms. The current periodic table lists 109 elements. It is arranged according to the periodic law; elements are arranged in order of increasing atomic number‚ their physical and chemical properties show a periodic pattern. Elements that have similar properties are arranged in groups or families in vertical columns‚ the horizontal
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cited as the inventor of the modern periodic table‚ his table was just the first to gain scientific credibility‚ and not the first table that organized the elements according to periodic properties. There are 90 elements on the periodic table that occur in nature. All of the other elements are strictly man-made. Technetium was the first element to be made artificially. The International Union of Pure Applied Chemistry‚ IUPAC‚ revises the periodic table as new data becomes available. At the time
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SILVER By: Wahida Gh-Sakhi What is Silver? Silver is a chemical element with the chemical symbol Ag and atomic number 47. A soft‚ white‚ lustrous transition metal‚ it possesses the highest electrical conductivity of any element and the highest thermal conductivity of any metal. Element Symbol • Ag • Silver‚ Symbol Element Name • Silver Atomic Mass • The atomic mass is 107.8682 Atomic Number • The atomic number is 47 Bohr-Rutherford Diagram The Story of its Discovery Unknown since prehistoric
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in vacuum or free space. Atomic radii may be derived from the distances between two nuclei when the two atoms are joined in a chemical bond. The radius varies with the location of an atom on the atomic chart‚ the type of chemical bond‚ the number of neighbouring atoms (coordination number) and a quantum mechanical property known as spin. On the periodic table of the elements‚ atom size tends to increase when moving down columns‚ but decrease when moving across rows (left to right). When subjected
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Kidneybeanium: 553.33 mg x 0.2143 = 118.58 - Relative Weight of Pintobeanium: 471.67 mg x 0.4286 = 202.16 - Relative Weight of Blackeyedpeaium: 222.00 mg x 0.3571 = 79.28 Part II Record your answer on the answer grid below. (3 point each) Chemical Name Chemical Formula Common Use 1 Sodium hydroxide NaOH Drain cleaner 2 Sodium hydrogen carbonate NaHCO3 Baking soda 3 Aluminum Oxide Al2O3 Sandblasting sand 4 Sodium hypochlorite NaClO Bleach 5 Aluminum sulfate AI2(SO4)3 Used in antiperspirant 6 Ammonium
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