Chapter 1 * What is Chemistry? -it is the study of the composition of substances and the changes they undergo. * What are the 5 branches of chemistry? * Organic chemistry‚ inorganic chemistry‚ analytical chemistry‚ physical chemistry‚ biochemistry. * What is the difference between a theory and law? -a theory is a thoroughly tested explanation of why experiments give certain results. A scientific law is a concise statement that summarized the results of a broad spectrum of observations
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ABSTRACT The short and unpredictable nature of the conventional chemical batteries‚ along with the frequent replacements that they require‚ has created an acute need for a reliable‚ longer-lasting and rugged source of energy. Moreover Radars‚ spacecrafts‚ interstellar probes and other advanced communication devices require much larger power than that can be met by conventional energy sources. The solution to long term energy source is the nuclear powered batteries which have a life span of few
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------------------------------------------------- 1.Top of Form Arrange the following elements in order of increasing electronegativity: germanium‚ bromine‚ selenium‚ arsenic Please answer this question according to the general rules you have learned regarding periodic trends. DO NOT base your answer on tabulated values since exceptions may occur. | germanium smallest arsenic selenium bromine largest Feedback: Electronegativity is the ability of an atom in a molecule to attract
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C A L I F O R N I A S TA N DA R D S T E S T Chemistry Released Test Questions Question Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 Correct Answer A A C A B D A A A B A A C D A A C D B D D C A C A C D A D A C A B D A Standard CHIE1.A CHIE1.A CHIE1.C CHIE1.D CHIE1.E CHIE1.F CHIE1.F CHIE1.G CHIE1.K CH1.A CH1.A CH1.A CH1.B CH1.B CH1.C CH1.C CH1
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Periodic Table of Elements 1 1 1 2 Atomic # 3 4 C Solid 5 6 7 8 Metals 9 10 11 Nonmetals 12 13 14 15 16 17 2 18 2 K 1 H 3 Symbol Name Atomic Mass 2 1 He Helium 4.002602 Hydrogen 1.00794 Alkali metals Alkaline earth metals Transition metals Poor metals Other nonmetals Noble gases 4 2 2 2 Li 11 Be Beryllium 9.012182 2 8 1 Hg Liquid H Gas Lanthanoids Actinoids 5 2 3 6 2 4
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NUCLEAR TERRORISM INTRODUCTION Nuclear terrorism denotes the detonation of a yield-producing nuclear bomb containing fissile material by terrorists.[1] Some definitions of nuclear terrorism include the sabotage of a nuclear facility and/or the detonation of a radiological device‚ colloquially termed a dirty bomb‚ but consensus is lacking. In legal terms‚ nuclear terrorism is an offense committed if a person unlawfully and intentionally “uses in any way radioactive material … with the intent
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Teen Smoking Peer pressure‚ to availability‚ to promotion‚ to the main cause‚ negative influences. These are some reasons that cause teens to smoke before the age of 18. Peer pressure is one of the most common effects that cause teens to smoke or try something that shouldn’t be tried. Especially when hanging with friends‚ a lot of teens get pressured into doing things and one of them is smoking. Friends pressure them into smoking and that’s when they try to fit in so they won’t get teased or become
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Chemistry Reference Tables Name Avogadro’s number Value 6.022 × 1023 particles/mole 0.0821 L atm mole K L mmHg 62.4 mole K 8.314 L kPa mole K 1.00 atm = 101.3 kPa = 760. mmHg = 760. torr 0°C or 273K 22.4 L Symbol Value Gas constant (R) Standard pressure Standard temperature Volume of 1 mole of any gas at STP Thermodynamic Constants Heat of fusion of water Heat of vaporization of water H f (water) Hv (water) 334 J/g 2‚260 J/g J for ice‚ 2.02 J for steam‚ g°C g°C J for liquid 4.18
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Palestine sits upon the Mediterranean Sea between Egypt‚ Syria‚ and Arabia; the land has switched hands many times over the past few thousands of years. Being a holy land for all three Abrahamic religions has led to a brutal conflict between them since their formation. The current conflict in Palestine has been raging for about three quarters of a century‚ but before it can be addressed some history must be known. For four centuries the land had been ruled by the Ottoman Empire‚ and as it began
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DISCUSSION NO. 3 THE PERIODIC TABLE OF ELEMENTS Members: Salvador‚ Kim Kristal G. Sanchez‚ Jhoana Marie V. Santeco‚ Francesca Anya C. Sy‚ Shane Francheska Lei Dayanne S. Ureta‚ Nheimelyn E. INUR-7 GROUP 10 HISTORY OF THE PERIODIC TABLE The discoveries of elements stole a long period of time. As a matter of fact‚ several elements were mentioned in Biblical accounts and Koran. However‚ it was in the 19th century where they get to discover a lot of element. And as the number of
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