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Honors Chemistry — Crosby
Academic Year 2017-18

 
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Welcome to the website for Honors Chemistry classes.

Schoology NPS Google Docs

New News!
Last update: Thursday, January 11, 2018 9:30 AM

Welcome Back!

8 Jan 18

The Ruthenium-105 answers are available here for you to check your results and significant figures. Remember, some deviation in the last digit is expected, depending on how intermediate values are carried forward. The answers shown here were calculated using a spreadsheet, so the only rounding used was for the answers presented.

b.
 
2.25(2) half-lives
c.
 
0.734(6) mol
d.
  Ru: −8.05435 × 108 kJ/mol/nucleon
Rh: −8.06008 × 108 kJ/mol/nucleon
f.
 
3.75 × 108 kJ released
g.
 
3470 houses (3 sig. figs.)
h.
 
3.76 (no units)
i.
 
2410 g (3 sig. figs.)

National Nuclear Data Center Interactive Chart of the Nuclides
 

2 Jan 18 

Use these values for the reference constants listed below1 so that you will be able to generate the same results as your peers. Pay attention to significant figures when working through Ruthenium-105.

Avogadro's Number
 
6.02214085774 × 1023 mol−1
speed of light
 
2.99792458 × 108 m/s
proton
 
1.0072764321 g/mol
neutron
 
1.0086649158 g/mol
electron
 
0.00054857990932 g/mol

1Source: National Institute of Science and Technology (NIST)
    * Atomic and Nuclear Constants
    * Physico-Chemical Constants
 
10 Sep 17  Start of the year papers:
  • Honors Chemistry Expectations. I gave you one copy to sign and return. If you want a copy for your records, please use the link to print one.
  • Flinn Safety Contract. I gave you one copy to sign and return. If you want a copy for your records, please use the link to print one.
 

3 Sep 17  Honors Chemistry Sections:
  • Crosby sections (A, B, F) meet in room 3107
  • Marshall sections (C, D) meet in 3107
  • McChesney section (E) meets in room 3102
All sections have their first meeting (10 minutes) on Tuesday, 5 Sep 17.
 
Chemistry is FUN!

 

 

 
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Copyright© 2005 – 2014, and 2015 by Alan Crosby (adcrosby@nshs-science.org)
Newton South High School, Newton Centre, MA 02459
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