University:
Thomas Jefferson University
Course:
CHEM 103 | Chemistry I
Academic year:

2024
Views:

200

Pages:

1
Author:

Imani H.

1/23/24 V DM 272727:27: V=100cm³ V 2.7 2) Elavents simplest foru. compounds can be broken down with Chemical Methods. Mixtures can be broken down with physical methods. Chapter 20 Nisclear Chemistry. Shucture & Stability Nuclear chausty is the study of reactions that involve changes to nuclear Structure. A specific nucleus is called a nuclide, & nuctions are protons &weutrons. The mass delicat is the difference between the mass obtained by adding up masses of protons, neutrons. & electrons & the actual mass of the nuclide the binding energy is given by E=MC², M= mass deficit &c= speed of light Ex: 19F has an actual mass of 18.9984 aMU Po 1.0075 AMU newhon: 1.0087 amu elechons: 0.0000бами expected mass 9(1.0078) 10/10087) 1910.00055)-19.1077 19.1577-18 9984-0.1993 amu = 2.645 8 10-25 g 1kg 2.646 11029 1000g E=MC²= (2.645x10-24) (2.9988108) 2.377x10" J (2.377110) (9+10)-1261810-12 J A nucleus with a greater binding energy per neven Is More Slable Muclides with an even number of protons Neutrons are more likely to be more stable than those with add numbers 227 Az 4 He+ 228 Fr 89 2 87 20.2 Nuclear Equations Alpha particle (a) He Beta particle (B) c given Positron De 229 2 Proton H Neutron N 3 know !! 89 Example: 25 Mg reacts with an alpha particle to produce a proton & another particle. 25 X= mass # 25+4=1+28 13 y: atomic 12+2=11 25 Mg + He 12 12 2 1 H+28 A1 13 Ex2: 212 Po decays to produce alpha particles 212PO 208 82 2 ExSn 2124+X X=208 84: 2+y = 82 Ex 3: 289 Th decays beta emission 234 234 The Pa १० Ex 4: "N combines with a neutron to produce a proton Sanother particle HN+NH+C 6

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