UNT CHEM 1360 - Exam 1 Study Guide (2 pages)

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Exam 1 Study Guide



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Exam 1 Study Guide

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Chapters 3 & 11 Study Guide


Pages:
2
Type:
Study Guide
School:
University of North Texas
Course:
Chem 1360 - Context of Chem

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Chem 1360 1nd Edition Exam 1 Study Guide Chapters 3 11 Chapter 3 the use of electricity to cause a chemical reaction is called electrolysis during electrolysis of molten sodium hydroxide chloride anions move to the anode which is positively charged Cathode rays are not composed of particles with a mass of 1 u Thomson used a cathode ray tube to discover that cathode rays are deflected by an electric field When J J Thomson discovered the electron he measured its mass to charge ratio Millikan determined the charge of an electron by noting that the drops had either a certain minimum charge or multiples of that charge the mass of an alpha particle is about four times that of a hydrogen atom compared to the charge on an electron the charge on an alpha particle is about 2 a beta particle is a helium nucleus the mass of a gamma ray is 0u radioactivity arises from elements that are unstable and emit radiation the most persuasive evidence from Rutherford s gold foil experiment was that most of the alpha particles wet right through the foil but a tiny fraction were reflected right back toward the source Rutherford s experiment showed that the nucleus was tiny and positively charged Rutherford concluded that atoms consist of empty space the positively charged part of the atom is the nucleus the identity of an element is determined by its number of electrons about 1800 electrons are required to equal the mass of one proton neutrons and protons have the same mass the number of protons plus neutrons in an atom is its nucleon number an atom in an excited state is one with an electron that has moved to a higher energy level Chapter 11 the largest source of background radiation is radon the largest source of background radiation is medical x rays what is used to irradiate foodstuffs to extend shelf life is gamma rays Iodine is sometimes used for detecting leaks in underground pipes because it has a short halflife what form of radiation is detected in PET scans positron which form of



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