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<b>Mr. <nowiki>McLeod</nowiki>'s Notes</b><br> As isotopes radioactively decay, they do this in a specific time rate called <b>Half life</b>. The word means what it says, how long until 1/2 the material has decayed. So a 100g sample of an isotope with a half life of 2 hrs, will have 50g after 2hrs, 25g after 4hrs, 12.5g after 6hrs, etc. That is about it. You will only be asked these simple math questions. You can actually derivate a specific math equation to determine the amount of sample decayed in non-half life time intervals (i.e. 5hrs in the example above) but you do not need to know how to solves these problems in first year chemistry.<br> <br> <br> <b><u>Notes from Section 26.4 Half Life (Addison Wesley Chemistry)</u></b><br> Def Half life - <bR> Draw a rough copy of Figure 26.7 to show the amount of istope remain varies over time (in units of half lifes). <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <b>Write out the radioactive decay series in Figure 26.8 (why does the series stop??)</b><br> <br> <br> <br> <br> Read the Carbon-14 dating insert on pg766 and explain why C-14 is such a powerful age dating tool.<br> <br> <br> <br> Look at Example 1 and then do Practice problem 10 below (pg766).<br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br>
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