CH302-unit7-freeresponse-RUBRIC

Note redundant items count as 1 chemical change has a

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Unformatted text preview: hemical change doesn’t) • (Potential energy chemical based off electrons nuclear based off nucleas) • Nuclear change can be used to date things. NOTE: Redundant items count as 1 (chemical change has a small amount of energy, nuclear changes produce a large amount of energy is ONE difference, not two) 1 point for each difference, Maximum 3 points 2. (3 pts) Write the balanced equation for the beta ( ­) decay of Am ­242. 242 0 242 242 0 242 95 Am →−1 β+ 96 Cm or 95 Am →−1 e+ 96 Cm 3 pts: Perfect equation 2 pts: Something is off, but mostly right • wrong type of decay, OR wrong element symbols, OR reversed equation € 1 pt: Something was correct, partial credit given • correct decay, wrong element and number, OR electron capture 3. (4pts) Determine the half ­life in units of hours for the beta ( ­) decay of Am ­242 given the following graph. m= ­k 3 − = ­k 70 k = 4.286 hrs ­1 ln(2) t1/2 = k t1/2 = 16.2 hrs 16 ± 2 accepted Partial credit given for equations € +1 for m =  ­k, +1 for half life +1 fo...
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