Nuclear Chem
What are the notations for alpha, beta, positron, and neutron particles?
alpha: 42He
beta: 0-1e
positron: 01e
neutron: 10n
What do the graphs for zero, first, and second order look like?
0: [A] vs time, negative linear slope
1: ln[A] vs time, negative linear slope
2: 1/[A] vs time, positive linear slope
Which is most soluble in hexane, C6H14?
a.) H2O
b.)NaCl
c.) CH3OCH3
d.) C5H12
d
How does K change when the coefficients in an equation are multiplied by the same number? When the reaction is reversed?
Raise K to that number
take the reciprocal/inverse of K
27 13Al + 4 2 He --> 30 15 P + ___
1 0n
A first order reaction has a rate constant of 4.38x10^-4. Calculate the half life in minutes.
26.4 min
Write the K expression for 2A(aq) + B(s) -->C(aq)
K = [C] / [A]^2
If you are standing behind a wooden door, what types of radiation are you protected from?
alpha and beta
The rate constant for this zero-order reaction is 0.0271 M/s. How long would it take the concentration of NH3 to decrease from 0.850 M to .320 M?
2 NH3 → 3H2 + N2
19.6 s
What conditions make a solid more soluble? A gas?
Solid: higher temperature
gas: lower temperature and higher pressure
PCl5(g) --> PCl3(g) + Cl2(g). Kp is 0.497 , the partial pressure of PCl5 is 0.860atm and the partial pressure of PCl3 is 0.350 atm. What is the partial pressure of Cl2?
1.22 atm
Write the nuclear equation:
bismuth-214 undergoes beta decay
214 83Bi --> 0 -1b + 214 84Po
The decomposition of SO2Cl2 is a first order process with a rate constant of 4.5 x 10-2 s-1. The initial concentration of SO2,Cl2 is 0.693 M. What is the concentration of SO2Cl2 after 24.5 seconds?
SO2Cl2 → SO2 + Cl2
0.230 M
Poison Ivy placed equal amounts of water in 4 different Erlenmeyer flasks to prepare solutions
to feed her villainous plants. Which flask had the
greatest vapor pressure? Which has the greatest mass of vapor pressure?
a.) 25 mL flask
b.) 50 mL flask
c.) 75 mL flask
d.) 250 mL flask
e.) all of them are the same
greatest vapor pressure: e, vapor pressure is intrinsic and does not depend on amount
greatest mass of vapor pressure: d, has the greatest area to hold vapor
The isotope 32P decays by first order kinetics and has a half life of 14.3 days. How long does it take for 95% of a sample of 32P to decay?
61.8
The decomposition of A + B → C is a second order process with a rate constant of 6.92 x 10-3 M-1s-1. The initial concentration of A is 0.0248 M. Calculate the concentration of A after 78.9 min.
0.0137 M
Calculate the molarity of a solution of HNO3 that is 35% mass and has a density of 1.21 g/mL. The molar mass is 63.02 g/mol.
6.7 M