Discussion12_ch19_081210_Answer - -2/day All radioactive...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
CHEM102 Discussion Class 12 (Chapter 19) Nuclear Particles (1) Write down notation for an atom with (a) 2 protons and 2 neutrons (b) 15 protons and 17 neutrons (c) 45 protons and 60 neutrons (d) 92 protons and 146 neutrons (e) Po-212 (f) H-1 (g) C-13 (2) Write down notation for (a) a proton (b) a neutron (c) an electron (d) a positron Nuclear Equations (3)Write a nuclear equation for the (a) α decay of Am-241 (b) α decay of Po-210 (c) β decay of Sr-90 (d) γ emission of Tc-99 (4) Write a nuclear equation for the (a) positron emission of C-11 (b) positron emission of I-121 (c) electron capture of Al-26 (d) electron capture in the nuclide made following α decay of Sc-44 Radioactive Decay Kinetics
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
(5) What is the half life of an element that has a radioactive rate constant k of 1.48x10
Background image of page 2
Background image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: -2 /day? All radioactive processes occur by first order kinetics. Hence, (6) How many atoms of U-236 remain after (t 1/2 = 2.30x10 7 years) 10,000 years if the initial sample contains 1.00x10 12 atoms? (7) A sample of human skull shows a C-14 / C-12 ratio of 95.6% of that of a living skull. How old is the skull? (t 1/2 C-14 = 5730 years) (8) I measure the α particle emission from a radioactive element as 1.02x10 3 /s. I measure it again 24.0 hours later and find it has decreased to 8.52x10 2 /s. What is the half-life of the element? (9) A smoke detector is considered unreliable when 10% of its 0.20ug sample of Americium-241 has decayed. How long will this take if the half-life for Am-241 is 432 years?...
View Full Document

This note was uploaded on 09/25/2010 for the course CHEM 123 taught by Professor Piao during the Spring '10 term at Aarhus Universitet.

Page1 / 3

Discussion12_ch19_081210_Answer - -2/day All radioactive...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online