Uranium (U) is a metallic‚ silver-gray element that is a member of the actinide series. It is the principle fuel for nuclear reactors‚ but it also is utilized in the production of nuclear weapons. Because uranium is radioactive‚ it is constantly emitting particles and changing into other elements‚ like thorium. Uranium has a well-established radioactive decay chain. U-238 and U-235 (which has 143 neutrons) are the most common isotopes of uranium. Uranium naturally includes all three isotopes (U-238
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Chemical Bonding You are to research the following questions and choose an appropriate format to present your answers in. Include diagrams where possible. 1. Describe metallic‚ ionic and covalent bonds. Metallic - A chemical bond in which electrons are shared over many nuclei and electronic conduction occurs. Ionic – A chemical bond in which one atom loses an electron to form a positive ion and the other atom gains an electron to form a negative ion. Covalent - A chemical bond that involves
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Chemistry: A Molecular Approach (Tro) Chapter 9 Chemical Bonding I: Lewis Theory 1) Which of the following represent the Lewis structure for N? A) [pic] B) [pic] C) [pic] D) [pic] E) [pic] Answer: A 2) Which of the following represent the Lewis structure for Cl? A) [pic] B) [pic] C) [pic] D) [pic] E) [pic] Answer: B 3) Which of the following represent
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3.1 a) Valence electron: Valence electrons are the electron in the outermost electron shells of an atom. They are generally the electrons involved in chemical reactions and bonding with other atoms. b) Lewis electron: It is a structural demonstration of a molecule where you can use dots to show the position of the electron around the atoms and lines. c) Octet rule: It is referring to the principle that bonded atoms share their eight outer electrons. There rule of the octet is sometimes broken
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in a glass of water? Why does it float to the surface‚ and not mix? The answer to this is simple: polarity. What exactly is polarity? A polar bond is when there is a difference in electronegativity‚ which means the tendency of an atom to attract a bonding pair of electrons. When two atoms are bonded together and one attracts more electrons‚ this results in a polar bond. If the atoms have a similar or close to similar amounts of electronegativity‚ the compound is nonpolar. When two compounds that have
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Experiment 3: Electronic structure‚ bonding and shape of some simple inorganic molecules. Introduction: In quantum chemistry‚ electronic structure is the state of motion of electrons in an electrostatic field created by stationary nuclei. The term encompass both the wave functions of the electrons and the energies associated with them. Electronic structure is obtained by solving quantum mechanical equations for the aforementioned clamped-nuclei problem. Electronic structure problem arise from the
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come up with a solution. Being able to apply your knowledge to an unknown problem is a tremendously important and beneficial skill! C H EM 301A - O rganic Chem istry L ecture N otes © Dr. Peter de Lijser‚ 2011 T opic A 1 : S tructure and Bonding The Periodic Table The nucleus contains positively charged protons and uncharged neutrons. The electron cloud is composed of negatively charged electrons. Elements in the same row are similar in size. Elements in the same column have similar
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forces include dispersion forces‚ dipoledipole interactions and hydrogen bonding. Dispersion forces‚ the weakest among the three‚ are brought about by an instantaneous or induced polarization of molecules. They are also known as van der Waals forces or London forces of attraction. Dipole-dipole interactions exist among polar molecules and are stronger than dispersion forces. A special kind of dipole-dipole force is hydrogen bonding which is the strongest intermolecular force of attraction. This is present
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Are you turning to the answers too soon? When you get stuck on a question do everything you can to answer it EXCEPT looking at the answer 1. Use your textbooks 2. Use your notes 3. Use the presentations 4. Use drop in 5. Use websites Don’t ever simply copy down an answer without knowing how to get there. BUT finally do check all your answers carefully here. You can also read the examiner’s report for each question.
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Ethanthiol has London-dispersion forces which does not attract to water because there is no Oxygen to bond to water. 6.) a.) i.) ii.) b.) In Box X‚ Compound 2 is represented because of the stronger intermolecular forces present (Hydrogen-bonding intermolecular forces)‚ therefore creating a higher boiling point (78ᵒ). c.) Dichloromethane has greater solubility in water than Carbon tetrachloride because Dichloromethane is polar while Carbon tetrachloride is nonpolar. Since Dichloromethane
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