cooling curve for water at 1 atm pressure. (Note: CI = heat capacity of water in region I‚ T = change in temperature between points specified‚ Hfus = heat of fusion.) Which of the following statements is/are true? I. No heat energy is being added or removed from the system between points B and C II. The quantity of heat being removed from the system between points C and D is equal to CIII x m x t(C and D) III. The quantity of heat being added to the system between points C and D is equal
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power and to drive the explosion of nuclear weapons. 3. Nuclear Fusion:- Nuclear fusion is the process by which two or more atomic nuclei join together‚ or "fuse"‚ to form a single heavier nucleus. This is usually accompanied by the release or absorption of large quantities of energy. Fusion is the process that powers active stars‚ the hydrogen bomb and experimental devices examining fusion power for electrical generation. Fusion generally occurs for lighter elements only‚ and likewise‚ that fission
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Moles 1.How is molar mass calculated and why is it useful? You have to multiply the atomic weight of each element by the number of atoms that it contains in a compound. Molar mass is useful because its used to change a measurement of mass to an amount of a substance such as the number of particles. 2.Define a mole in chemistry and give 3 examples equivalent units that are used in chemical calculations. A mole measures the amount of a substance. Three examples that are equivalent to a mole is molar
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until it becomes a protostar. Next a fusion reaction happens‚ this will occur when the density and temperature are high enough‚ this happens for a very long time. After a while
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is the splitting of an atom’s nucleus into parts (lighter nuclei that are different from the parent and neutrons) by capturing a neutron. Nuclear fission produces heat (also called an exothermic reaction)‚ because if you add all the masses together of the products of reaction you do not get the starting mass. That loss of mass is the heat and electromagnetic radiation produced during fission‚ and it produces large amounts of energy that can be utilized for power. Fission produces neutrons which can
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10/22/2014 Physical Science Physical Changes I like physical changes more than chemical changes. Some reasons are‚ physical change is "easily" reversible‚ how liquids can become solid and vice versa‚ the solid disappears but just the application of heat can boil the water off and get the salt back in the same form. Therefore‚ I like physical changes more than chemical changes. I like physical changes more than chemical changes because physical change is "easily" reversible because physical changes
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alloys for nuclear energy There are two important ways in the making of nuclear energy: nuclear fission and nuclear fusion. Fusion and fission have a different working mechanisms‚ thus other materials are used. In a nuclear reactor fuel rods are bombarded with neutrons causing fission of the fuel. This way energy is released. With this energy water is heated to steam and with the use of heat exchangers and steam turbines electricity is generated. As fuel is usually uranium used‚ but also plutonium and
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Presence of Insecticides & Pesticides in Fruits & Vegetables SCHOOL : K .V N T P C CHEMISTRY PROJECT REPORT STUDY THE PRESENCE OF INSECTICIDES AND PESTICIDES IB FRUITS AND VEGETABLES Name : Class : Reg. No : Examiner Teacher-in charge. CERTIFICATE This is to certify that the project was done by …………………………… Reg. No ……………….. Is in partial fulfillment of Chemistry Practical Examinations
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Heat is transferred spontaneously from warmer objects to cooler objects. Temperature (T) is a measure of the average kinetic energy of the particles that make up a substance (unit of Celsius; oC or Kelvin; K). [pic] Enthalpy and Energy Change
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solutions. Planck’s work on quantum theory‚ as it came to be known‚ was published in the “Annalen der Physi” (Annals of Physics). His work is summarized in two books‚ “Thermodynamik” (Thermodynamics) in 1897‚ and “Theorie der Wärmestrahlung” (Theory of Heat Radiation) in 1906. Max Planck is commonly known as “The Father of Quantum Theory.” He dedicated his life to understanding the workings of Quantum Physics‚ and was awarded the Nobel Prize in Physics in 1918. For years that spanned several decades
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