gases. * These five toxic‚ non-metallic elements make up Group 17 of the periodic table and consist of: fluorine (F)‚ chlorine (Cl)‚ bromine (Br)‚ iodine (I)‚ and astatine (At). * Although astatine is radioactive and only has short-lived isotopes‚ it behaves similar to iodine and is often included in the halogen group. * Since the halogen elements have seven valence electrons‚ they only require one additional electron to form a full octet. This characteristic makes them more reactive
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The Manhattan Project was secret military project created in 1942 to produce the first US nuclear weapon. The Manhattan Project basically arrived from the ideals and fears of a Nazi Germany having access to nuclear capabilities during the war‚ and the threat of them using those nuclear weapons was at an all time high during the reign of Hitler. In order to combat this alarming problem‚ the United States government/military started a top secret program to help develop the world’s first nuclear weapon
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Ionic compound: is a chemical compound in which ions are held together by lattice structure by ionic bonds Types of Radiations: Alpha‚ Beta and Gama Half life - The time taken for the radioactivity of a specified isotope to fall to half its original value. Characteristics of living things: reproduces‚ respiration‚ Organic matter refers to that matter which is form a once a living organism and is capable of decay. It also entails the composition of organic compounds. Organic matter comes from
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Bose–Einstein condensate From Wikipedia‚ the free encyclopedia Jump to: navigation‚ search Velocity-distribution data of a gas of rubidium atoms‚ confirming the discovery of a new phase of matter‚ the Bose–Einstein condensate. Left: just before the appearance of a Bose–Einstein condensate. Center: just after the appearance of the condensate. Right: after further evaporation‚ leaving a sample of nearly pure condensate. A Bose–Einstein condensate (BEC) is a state of matter
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1. Prehistoric Times - Beginning of the Christian Era (Black Magic) Existence of Fire Arguably the first chemical reaction used in a controlled manner was fire. However‚ for millennia fire was simply a mystical force that could transform one substance into another while producing heat and light. Fire affected many aspects of early societies. These ranged from the simplest facets of everyday life‚ such as cooking and habitat lighting‚ to more advanced technologies‚ such as pottery‚ bricks‚ and
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enrichment process. Natural uranium is composed of three isotopes: uranium-238‚ uranium-235‚ and uranium-234. The proportions of each in natural uranium are: uranium-238 99.28 percent‚ uranium-235 0.71 percent‚ and uranium-234 0.0058 percent by mass. The difference in each isotope comes from the number of neutrons. All the isotopes have number of protons which is 92. Uranium-238‚ 235‚ and 234 have 146‚ 143‚ and 142 neutrons respectively. All isotopes of uranium are radioactive. DU is considerably less
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IB Questionbank Physics Energy‚ Power and Climate 1. In which of the following places will the albedo be greatest? A. B. C. D. A forest A grassland An ocean A polar ice cap (Total 1 mark) 2. A spherical black body has absolute temperature T1. The surroundings are kept at a lower absolute temperature T2. What is the net power per unit area lost by the body? A. B. C. D. σT14 σT24 σ(T14 – T24) σ(T14 + T24) (Total 1 mark) IB Questionbank Physics 1 3. What is the unit of surface heat capacity
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Bio 1610 Vocabulary Words CH 1-4 CH 1 Emergent Properties- The greater good‚ bike parts in a box = useless‚ put them together = useful. Systems Biology- Using data to predict the function or result of an affect or variable has on a biological system. Biosphere- The earths atmosphere‚ the earths crust‚ the life in the ocean etc. Ecosystem- A community of organisms and their physical environment‚ ie- the dessert‚ a coral reef‚ a jungle etc. Community- All of the groups of animals or
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CHE 140 Name__Chesi Spriggs First Hour Exam Potentially useful information 1000 g = 1 kg 1000 mL = 1 L 1 in = 2.54 cm 1 mL = 1 cm3 D = m/v Select the best choice for the following questions. ___e___ 1. A hypothesis is a(n) a. formulation of principles based on facts. b. modification of a theory. c. organized body of knowledge. d. tentative explanation of observations. e. None of the above. __b___ 2. The initial success of the Bohr theory was based
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Physics Final Exam revision c 4/8/15 Directions: It is important that you provide answers in your own words. Please focus only on information from the text/eBook to create your own solutions. Please do not use direct information from an outside source (especially copying and pasting from an “answer” website). Use of direct information from an outside source is against school policy. All answers will be checked for plagiarism. Instances of plagiarism can result in probation or possible
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