1. Which of the following statements about heat is false? A) If heat flows into a system‚ the extra energy of the system appears in the form of internal energy. B) A hot object possesses more heat than a cold object. C) If the system and surroundings are in thermal equilibrium‚ there is no heat flow between them. D) A process in which heat flows out of a system is said to be exothermic. E) Heat is a form of energy flow. B is false. If you compare a cup of water at 25oC and a bath tub of
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Families of elements—Nonmetals 1. Chemical properties of the halogen family are that the halogens are located in Group VIIA of the periodic table‚ and are a class of nonmetals. The halogen elements are fluorine‚ chlorine‚ bromine‚ iodine‚ astatine‚ and ununseptium. These nonmetals are reactive and have seven valence electrons. 2. Halogens are located in Group VIIA which means they have seven valance electrons. One short from an octet. 3. Similarities with almost all solutions except for Test tube
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Electron Configuration Patterns WE CANNOT KNOW THE EXACT LOCATIONS OF ELECTRONS WITHIN ENERGY LEVELS‚ BUT WE CAN DESCRIBE PROBABLE REGIONS OF ELECTRON LOCATION. Our understanding of electron distribution is based on mathematical probabilities that result from knowledge about the behavior of charged particles in an atom: |a) | | |b) |
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Ramsey. It was named after the Greek word‚ kryptos‚ which means “hidden”. The basic facts: Noble gases carry the trait of not reacting with many elements and Krypton is classified in this group. It is located in Group 18 and Period 4 of the periodic table. Krypton’s symbol is Kr. Krypton’s atomic number is thirty-six and the atomic mass is 83.80. There are thirty-seven different isotopes in the element‚ krypton. Scientists that Discovered Krypton: Morris Travers is a British chemist who was
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THE ITALIAN UNIVERSITIES’ INTERNATIONAL MEDICAL ADMISSIONS TEST (IMAT) TEST SPECIFICATION In partnership with Ministero dell’Istruzione‚ dell’Università e della Ricerca (MIUR) February 2013 Test Specification Test Format The IMAT will have the same structure as the existing Italian test. Candidates are allowed a total of 90 minutes to complete the test. Section 1 General Knowledge and Logical Reasoning (Critical Thinking and Problem Solving) 30 multiple-choice questions. Sections
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webelements.com/gold/physics.html Your presentation should include the following information: the element’s name and the origin of its name the element’s symbol‚ atomic number‚ and atomic mass the group/section where the element is found on the periodic table the element’s electron configuration and number of valence electrons. At least eight other researched physical and chemical properties of the element should be mentioned. These properties may include but are not limited to: color texture
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Gallium Gallium was discovered through a spectroscope by a French chemist named Paul Emile Lecoq de Boisbaudran in 1875. The name Gallium comes from the Latin word‚ Gallia‚ which means France. It is also possible that he named it after himself because Lecoq means the rooster in French and the Latin word for rooster is “gallus” but he denied that claim. Gallium is a silvery blue metal with a unique characteristic. It has a melting point of only 85.6 degrees Fahrenheit so it will actually melt
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chemical substance consisting of one type of atom distinguished by its atomic number. Hydrogen‚ carbon‚ lithium‚ oxygen‚ and arsenic are all elements what differentiates them all from each other is that they may be part of different groups of the periodic table and more importantly‚ their atomic number. 11. It allows us to see the energy state of the atom and to decipher what element it is‚ if necessary. 13. Because the Doppler shift principle is only applicable in situations in which the object
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reaction the temperature increases to about 10000 c . The reaction is carried out in an argon atmosphere to prevent magnessium and sodium from reacting with oxygen in the air. 3.Another gas used instead of argon. any of the elements in group O of the periodic table including helium ‚neon‚krypton‚xenon‚and radon which are monoatomic and with limited excemptions chemically innert. 4.Why titanium is an expensive metal Titanium is very expensive because it is akward to extract from ore -for example rutile‚TiO2
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Solutions are in the liquid state. b. Solutions are homogeneous. c. Solutions are mixtures. d. Solutions are composed of at least two compounds. (97)How does a molecule differ from an atom? (Chapter 2) (98)A student writes down the density of table sugar as 1.59 and the density of carbon dioxide as 1.83. Can these values be correct? Explain. (Chapter 3) (99)A block of wood measuring 2.75 cm × 4.80 cm × 7.50 cm has a mass of 84.0 g. Will the block of wood sink or float in water? (Chapter 3)
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