The Identification and Production of Materials 1. Fossil fuels provide both energy and raw materials such as ethylene‚ for the production of other substances. Students Learn To: .2 Identify the industrial source of ethylene from the cracking of some of the fractions from the refining of petroleum. • Ethylene is produced either from natural gas or crude oil‚ which are mixtures of hydrocarbons. One method involves… Cracking: a process by which hydrocarbons with higher molecular
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measureable records that can provide data on factors such as temperature‚ ice cover‚ and precipitation. Isotopes – A form of an element in which the atoms have more (or less) than the usual number of neutrons. Isotopes of a given element have identical chemical properties‚ but differ in mass (weight) as a result of the superfluity (or deficiency) of neutrons. Many isotopes are unstable and radioactive. Milankovitch Cycles – A cycle of major oscillations in the Earth’s orbit‚ taking place over frequencies
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metals. The purpose of this paper is to educate the reader with a basic understanding and knowledge about this element. I will cover specific information such as subatomic particles and availability in nature as well as information on the element’s isotopes. First of all‚ the element was not recognized to be different than iron until the 1600’s. Miners in Germany were trying to extract copper from ore‚ but were unsuccessful at any rate. They narrowed their problem down to a dark red ore‚ often with
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values of In A = 15.6 and Ea = 261 x 103 into the Arrhenius equation. k = 3.595 x 10-17 s-1 half-life = ln2/k = 1.93 x 1016 s (3sf) Example 5 Radioactive decay follows first order kinetics. The amount of radioactivity recorded from an isotope decreased from 2720 counts to 85 counts in 45 hrs. Determine the time required for the radioactivity of the same isotope to drop from 2400 counts to 300 counts?
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masses and the same charges. (4) They have different masses and different charges. 3 The atomic mass of an element is the weighted average of the masses of (1) its two most abundant isotopes (3) all of its naturally occurring isotopes (2) its two least abundant isotopes (4) all of its radioactive isotopes 4 Which statement is true about the charges assigned to an electron and a proton? (1) Both an electron and a proton are positive. (2) An electron is positive and a proton is negative
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SCIENTIFIC ADVANCEMENT IS A BOON OR BANE INTRODUCTION Science offers knowledge based on experiment and observation‚ but technologyis the total sum of the application of knowledge. This has made life easy and comfortablefor the user. A country said to be a developed country when it has many technicaladvancements. A small country like japan has succeeded to acquire this prestige becauseof its advancements and applications of technology at a high level. This century is the ageof Science. We cannot
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Chapter 2 The Chemical Context of Life PowerPoint Lectures for Biology‚ Seventh Edition Neil Campbell and Jane Reece Copyright © 2005 Pearson Education‚ Inc. publishing as Benjamin Cummings • Overview: Chemical Foundations of Biology Copyright © 2005 Pearson Education‚ Inc. publishing as Benjamin Cummings • The bombardier beetle uses chemistry to defend itself Figure 2.1 Copyright © 2005 Pearson Education‚ Inc. publishing as Benjamin Cummings • Concept 2.1: Matter consists
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about atoms being indivisible (that’s how we know about protons and neutrons and electrons and the other subatomic particles). And how atoms of the same element have identical properties: atoms of an element may have slightly different masses‚ e.g: ISOTOPES. You can see an atom using the scanning tunneling microscope. 4-2: Discovering subatomic particles and Nuclear particles (alpha‚ beta‚ gamma) Discovering the electron was a complete accident Cathode ray tube: used by Sir William Crookes. He
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However‚ the most common isotope of Tin is 112Sn because it is .97% abundant. https://education.jlab.org/itselemental/iso050.html. The percentage is 112 Sn in nature has not yet been discovered. There are many uses for the element tin‚ like mentioned before in this paper Tin is used
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Homework – Chapter #2 and #3 1. What is an atom‚ what is an atom composed of and what are the charges of each Component? 2. What is an element? 3. What is atomic number and atomic mass? 4. What is an isotope and how do isotopes interact with other atoms? 5. What is a radioactive isotope? 6. Draw the shell model for the elements carbon‚ oxygen‚ sodium and chloride? 7. What does inert mean? 8. Define chemical bond‚ molecule‚ compounds‚ and mixture. (Give examples) 9. Write a chemical equation
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