Determining the Percentage of Copper in a Copper Ore Aim: To determine the percentage of copper present in malachite. Hypothesis: That the percentage of copper in the malachite will be four percent. Materials: 2 x 250mL beaker‚ pestle‚ malachite‚ sulfuric acid‚ water‚ 2 x filter paper‚ funnel‚ filter stand‚ Safety Precautions: Wear safety glasses at all times when dealing with chemicals and apron to avoid ruining clothes. Method: Record the mass of the malachite sample. Place the malachite
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Republic of the Philippines DEPARTMENT OF EDUCATION K to 12 Basic Education Curriculum Technology and Livelihood Education Learning Module CONSUMER ELECTRONICS SERVICING EXPLORATORY COURSE Grade 7 and Grade 8 TABLE OF CONTENTS What Is This Module About ? ................................................................................... 2 How Do You Use This Module ………………………………………………3 LESSON 1 – Use Hand Tools ...................................................................
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Chemistry 11 Final Examination Review - Answers Part A - True or False. Indicate whether each of the following statements is true or false. Correct the false statements. F 1. The mass of an electron is equal to the mass of a proton. The mass of an electron is less than the mass of a proton. T 2. The mass of a proton is approximately equal to the mass of a neutron. T 3. The atomic number represents the number of protons in a nucleus. T 4. The proton has a mass of approximately
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1 IDENTIFICATION OF BASIC ELECTRONIC COMPONETS THEIR CHARACTERISTICS & TESTING 1.0.0 INTRODUCTION An electronic circuit is composed of various types of components. Some of these components are termed as active components because they take part in the transformation of the energy while other components‚ which only dissipate or store energy‚ are called as passive elements. The vacuum tubes‚ rectifier‚ transistors are some of-the common active while the resistances‚ which dissipate the power
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Copper vs. Fiber Modern telecommunication networks rely primarily on two types of cable. Older copper cables have been replaced in many cases by fiber optic "light pipes‚" first in undersea cables and major intercity trunks‚ and later directly to many homes and businesses. Principles Copper cables carry information as an electrical signal‚ which may be digital‚ as in phone lines‚ or analogue‚ as in audio speaker cable. In optical fibers‚ however‚ data is carried digitally by light from a laser
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Copper in Silver Nitrate Lab: Making Silver Sabrina Kate S. Carranza – Chemistry Hour 6 I. Purpose: The purpose of this experiment is to distinguish the relationships between reactants and products‚ in addition to expanding on concepts such as single displacement reactions‚ mole ratio values‚ moles to mass‚ theoretical yields‚ limiting reactants‚ excess‚ stoichiometric relationships and percentage errors. II. Hypothesis: /3 -If the copper metal is submerged in the silver nitrate solution
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First Book Critique: Collapse by Jared Diamond Collapse‚ written by Jared Diamond‚ shows how environmental problems in today are connected with many of the same environmental reasons of collapse in ancient civilizations. Diamond wrote this book to show that if people don’t take care of the land while there is time‚ the whole world could end up collapsing just like many other ancient civilizations. Instead of starting in the past‚ Diamond goes to the present time to show people that there are
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I. Reform and Protest in the 1960s A. Cold War Tensions Thaw 1. Buoyed by the rapidly expanding economy of the postwar era‚ the political consensus in western Europe shifted to the left. 2. In Britain‚ the Labour Party returned to power in 1964. 3. In the Scandinavian countries of Denmark‚ Norway‚ and Sweden‚ Social Democratic parties maintained a leading role throughout the period. 4. In West Germany‚ Willy Brandt (1913–1992) became the first Social Democratic West German chancellor
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The phrase "a happy worker is a productive worker" has been coined for a very long time. It is my belief that someone who is satisfied with his/her work (thus‚ happy) will always be more productive compare to someone dissatisfied with his/her work (thus‚ unhappy). But how can a boss make his workers happy‚ this lead us to a hotly debated topic: Performance Appraisal vs. Pay. I personally feel pay approach is more potentially motivating a worker to contribute more to an undertaking. According
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nearly 300 workers‚ with another 200 or so running "satellite" businesses that operate as subcontractors to Semco‚ and were set with its help. The Portuguese-language edition of Maverick‚ Semler’s account of the unorthodox management practices he has experimented with at Semco‚ has sold almost half a million copies. The English-language edition‚ from which this article is adapted‚ is published this fall by Warner Books. Finally‚ a firm where the boss has taken a back seat and lets workers make the
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