Transition chemistry
Solids
Gas Laws
100
Consider the complex ion [Co(en)(NH3)2(SCN)2]+. What is the charge on the cobalt ion?
What is 3+
100
The ionic radius of the Ca2+ cation is 0.099 nm and of the O2- anion is 0.140n. Calculate r+/r- for CaO and describe the hole geometry.
What is .71 so octahedral hole?
100
A gas at constant temperature is compressed from a volume of 5.0 L to 2.0 L. What will the final pressure be if the initial pressure was 0.40 atm?
What is 1.0 atm?
200
4. A solution of hexa(S-thiocyanato)ferrate (III), [Fe(SCN)6]3-, ion is red. At approximately what wavelength would you expect a solution of hexa(S-thiocyanato)ferrate (III) to absorb light?
What is green (550)
200
Based on the heating curve for this material in figure 3, by what factor is DHvap larger than DHfus?
What is a factor of 6?
200
the ideal gas law most likely to correctly predict volume at high or low temperature, and at high or low pressure?
What is high temperature and low pressure
300
A solution of hexa(S-thiocyanato)ferrate (III), [Fe(SCN)6]3-, ion is red whereas a solution of the hexaaquairon (III) ion, [Fe(H2O)6]3+ is very light blue. b. Based on the information above, is S-thiocyante a stronger or weaker field ligand than water?
What is stronger?
300
Gallium Arsenide, GaAs, is a commonly encountered III-V semiconductor. Describe how you could make an n-type doped material using only Ga and As.
What is adding more As?
300
A 2.0 L container is filled with 2 mol O2 (g), 2 mol N2 (g), and 6 mol Ne (g). If the total pressure is 1 atm, what is the partial pressure of oxygen in the container?
What is .2 atm?
400
Which is more likely to be paramagnetic, Fe(CN)6 4- or Fe(H2O)6 2+?
What is Fe(H2O)62+?
400
Pure GaAs absorbs light with a wavelength of 927 nm. Would the p-type doped GaAs absorb light of longer or shorter wavelength?
What is longer?
400
Which of the carbon-centered tetrahedral molecules below would you expect to have the largest a constant in the van der Waals equation? a) CH4 b) CCl4 c) CH3F d) CH3Cl
What is b?
500
A researcher uses Co(NH3)63+, Co(CN)63-, and CoF63- to make three colored solutions. The three solutions are green, yellow, and blue. Which complex corresponds to each color?
spectrochemical series: Co(CN)63- > Co(NH3)63+ > CoF63- Looks green  absorbs red (long wavelength, lowest energy) Looks blue  absorbs orange (intermediate wavelength, intermediate energy) Looks yellow  absorbs violet (short wavelength, highest energy)
500
Figure 5 shows the structure of an important superconductor made from Y, Ba, Cu, and O. Based on the structure, this is the formula of YBCO.
What is YBa2Cu3O7?
500
Below is the Maxwell-Boltzman velocity distribution for H2 (g), He (g), and N2 (g) in a container at a temperature of 273 K. Label the three gases in the figure as N2, H2, and He and briefly justify your assignment
What is ask Bao
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