Make a drawing, based on the kinetic-molecular theory and the ideas about atoms and molecules presented in this chapter, of the arrangement of particles in each of the cases listed here. For each case, draw 10 particles of each substance. It is acceptable for your diagram to be two dimensional. Represent each atom as a circle, and distinguish each different kind of atom by shading. (a) a homogeneous mixture of water vapor and helium gas (which consists of helium atoms) (b) a heterogeneous mixture consisting of liquid water and solid aluminum; show a region of the sample that includes both substances (c) a sample of brass (which is a homogeneous solid mixture of copper and zinc)
Make a drawing, based on the kinetic-molecular theory and the ideas about atoms and molecules presented in this chapter, of the arrangement of particles in each of the cases listed here. For each case, draw 10 particles of each substance. It is acceptable for your diagram to be two dimensional. Represent each atom as a circle, and distinguish each different kind of atom by shading. (a) a homogeneous mixture of water vapor and helium gas (which consists of helium atoms) (b) a heterogeneous mixture consisting of liquid water and solid aluminum; show a region of the sample that includes both substances (c) a sample of brass (which is a homogeneous solid mixture of copper and zinc)
Make a drawing, based on the kinetic-molecular theory and the ideas about atoms and molecules presented in this chapter, of the arrangement of particles in each of the cases listed here. For each case, draw 10 particles of each substance. It is acceptable for your diagram to be two dimensional. Represent each atom as a circle, and distinguish each different kind of atom by shading.
(a) a homogeneous mixture of water vapor and helium gas (which consists of helium atoms)
(b) a heterogeneous mixture consisting of liquid water and solid aluminum; show a region of the sample that includes both substances
(c) a sample of brass (which is a homogeneous solid mixture of copper and zinc)
Technetium is the first element in the periodic chart that does not have any stable isotopes.
Technetium-99m is an especially interesting and valuable isotope as it emits a gamma ray with a half
life ideally suited for medical tests. It would seem that the decay of technetium should fit the
treatment above with the result In(c/c) = -kt. The table below includes data from the two sites:
http://dailymed.nlm.nih.gov/dailymed/druginfo.cfm?id=7130
http://wiki.medpedia.com/Clinical: Neutrospec_(Technetium_(99m Tc)_fanolesomab).
a.
b.
C.
Graph the fraction (c/c.) on the vertical axis versus the time on the horizontal axis. Also
graph In(c/c.) on the vertical axis versus time on the horizontal axis.
When half of the original amount of starting material has hours fraction remaining
disappeared, c/c = ½ and the equation In(c/c.) = -kt becomes
In(0.5) = -kt1/2 where t₁₂ is the half life (the time for half of the
material to decay away). Determine the slope of your In(c/c.) vs
t graph and…
Please correct answer and don't use hand rating
1.
a) Assuming that an atom of arsenic has hydrogen-like atomic orbitals, sketch the radial
probability plots for 4p and 4d orbitals of S atom. Indicate angular and radial nodes in
these orbitals.
(4 points)
b) Calculate Zeff experienced by and electron in 4p AO's in a arsenic atom. Use Slater rules
that were discussed in lecture.
(3 points)
Microbiology with Diseases by Body System (5th Edition)
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