Chemistry of Life week 6
Chemistry of Life week 6 CHEM 120 - 04
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CHEM 120 - 04
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This 3 page Class Notes was uploaded by Samantha Weller on Monday October 12, 2015. The Class Notes belongs to CHEM 120 - 04 at Radford University taught by Lissa F Huston in Summer 2015. Since its upload, it has received 23 views. For similar materials see Chemistry of Life in Chemistry at Radford University.
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Date Created: 10/12/15
Chemistry of Life Week 6 Notes Nuclear Chemistry Radioactive an unstable nucleus spontaneously emits small particles of energy called radiation to become more stable Radiation may take the form of alpha and beta particles positrons or gamma radiation Emma mnlm Eon liljon sofUtilstaihlo Nuclei Number Nmnher H a 2 4 romiror 3 33 Ho j 8 1 no 11 1in ratio too high change Positron emirasiorr H a 1 rio 11pr ratio too iow v v v errriosiori 15 no no Excited with quot I 39 v quot W eiootrorr poortrorrerrrrosrorr Beta particles 1 electron Alpha a hydrogen atom with 4 as amu and 2 protonselectrons Positron like a beta particle but with a 1 charge Nuclear reactions change the nucleus making a new atom In chemical reactions atoms are rearranged but retain their identities Different isotopes in the same element behave the same in chemical reactions but are often completely different in nuclear reactions Rates of nuclear reactions are not affected by temperature pressure or catalyst Nuclear reactions for a particular atom are the same regardless of the elemental or molecular form the atom takes Energy changes in nuclear reactions can be several million times as large as those in chemical reactions Chapter 7 Chemical Quantities amp Reactions You need 2 hydrogen molecules for every oxygen molecule The Mole The amount of a substance that contains as many elementary entities as there are atoms in exactly 1200g of carbon 12 6022 1023 particles 1 mole Also called Avogadro s number A mole of moles One mole of moles placed head to head would stretch 11 million light years and weight 910 as much as the moon Particles to Moles Conversion If we have 20 1024 atoms of Be how many moles of Be do we have 1 mol 6022 1023 particles 1 mol 6022 1023 particles 20 1024 atoms Be X 1 mol 33 mol Be 6022 1023atoms Cancel out atoms to get moles Moles to particles conversion If we have 30 moles of 503 how many molecules do we have 30 mol SO3X 60221023moecues 503 18 1024 moles of 503 1 mol 03 Molar Mas Molar Mass the mass of one mole of a pure substance Numerically equal to the atomic mass of the elements in amu s Element Molar Mass 210 160 10 gmoll 214l81 52l416 glmoll 1373 3043 6 1611 2613 Chemical equation uses chemical symbols to denote what occurs in a chemical reaction CEH menzene 02 Ir C02 H20 Hg Cl I HCI CH4H2ID I CGH2 F3304C I FeCO NCI 02 I N02 NaN03 I NaNOz 02 NH302 I N2H20 NH3 02 I N20 H20 COEH2 I COH20 Dmmwmmhmm 39 Law of Conservation of Mass matter is neither created nor destroyed in a chemical reaction The total number of atoms of each element to the left of the reaction arrow will match the total number of atoms of that element to the right of the reaction arrow
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