CLST 2090 Chapter : Astronomy Final

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azuremammoth471

15 Mar 2019

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If the frequency of a beam of light were to increase, its period would _________ and its wavelength would _________: decrease; increase increase; decrease increase; increase, decrease; decrease, stay the same; stay the same. 1: as wavelength increases, the energy of a photon _____ and its frequency _____. increases; decreases increases; increases, decreases; decreases, decreases; increases. 2: you observe the spectrum of two stars. Star a has an emission line from a known element at 600 nm. Star b has emission lines from the same atom, but the emission line is occurring at 650 nm. Star a is twice as far away from earth as star b. Infrared astronomy (sofia) are two examples of telescopes placed in high- flying aircraft. This means that the weight of the star pushing inward at a given radius. _________ as you move inward toward the core. increases: decreases, stays the same, there is not enough information to answer.

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Hi Everyone,

I am wondering, if my homework isright...Please let me know if it is! Thanks!

1.Compare the properties of the blue and red ends of the visiblespectrum. The blue end:

A. is higher in energy thanthe red end

B. has a lower frequency than the red end

C. has a longer wavelength than the red end

D. all of the above are correct

E. none of the above is correct

2.Emission of light from an atom occurs when an electron

A. moves up one energy level

B. climbs up two energy levels

C. moves around the nucleus at an increased speed

D. moves from a higher to a lower energy level

E. gains a photon as it goes from a higher to alower energy level

3.Which of the following electron transitions corresponds to emissionof the longest wavelength light?

A. from n = 3 to n = 2

B. from n = 1 to n = 5

C. from n = 4 to n = 2

D. from n = 1 to n = 2

E. from n = 5 to n = 1

4.Emission from an excited Hg atom emits at 254 nm. What is thefrequency of this light?

A: 1.18e15 sec^-1

B: 1.18e15 sec

C: 1.18e6 sec^-1

D:1.18e6 sec

5.Order the following elements in terms of increasing ionization energy:Ar, Cl, Na, S

A: Na, S, Ar, Cl

B: Cl, Ar, S, Na

C: Ar, Cl, S, Na

D: Na, S, Cl, Ar

6.Order the following elements in terms of decreasing electronaffinity (note that a decreasing electron affinity, refers to anincreasing tendency to want to capture an electron): Ar, Cl, Na,S

A: Na, S, Ar, Cl

B: Cl, Ar, S, Na

C: Cl, S, Na, Ar

D: Ar, Na, S,Cl

7.Order the following elements in terms of increasing atomic radii:Ar, Cl, Na, S

A: Na, S, Ar, Cl

B: Cl, Ar, S,Na

C: Ar, Cl, S, Na

D: Na, S, Cl, Ar

8.What is the correct electronic structure for Calcuim?

A 1s2, 2s2 2p6 3s2 3p4 4s2

B:1s2 2s2 2p6 3s2 3p6 4s2

C:1s2 2s2 2p6 3s2 3p6 4d2

D:1s2 2p6 3d10 4f2

9.Order the following compounds in terms of increasingpolarity.

CO,CCl₄, NaCl, H₂O

A. CCl₄, CO, H_Â2O, NaCl
B. NaCl, H₂O, COCCl₄,
C. CO, CCl₄, H_Â2O, NaCl
D. NaCl, H₂O, CCl₄, CO

10. How manyvalence shell electrons are in the moleculeCCl₄?

A. 8 D: 40

B.18 E: 74

C. 32

Its due soon, andI am tired from studying for finals, so I don't think these areright but hopefully you can help me! Thanks! =)

silvermuskrat207

CHE 169 Exp. #3 The Determination of an Equilibrium Constant hemical reactions occur to reach a state of cquilibrium. The equilibrium state can be characterized by uaively delining its equilibrium constant, K In this experiment, you will determine the value of Ke or the reaction between iron (III) ions and thiocyanate ions, SCN Fe (aq)+ SCN (aq)FesCN (aq) he equilibrium constant, Kng, is defined by the equation shown below. To find the value of Ky, which depends only upon temperature, it is necessary to determine the molar oncentration of each of the three species in solution at equilibrium. The concentration will be determined by neasuring light that passes through a sample of the equilibrium mixtures. The absorbance of the colored olution is proportional to its concentration. The red pectrometer, an appropriate wavelength for maximum absorbance will be determined. FeSCN solution absorbs blue light. Using the n order to successfully evaluate this equilibrium system, it is necessary to conduct three separate tests First, a series of standard solutions of FeSCN will be prepared from solutions of varyin concentrations of SCN and constant concentrations of H' and Fe". The Fe concentration will be in side reactions (to form FeOH, for example). The excess of Fe" ions will make the SCN ions the limiting reagent, thus all of the SCN used will form FeSCN ions. The FesCN complex forms slowly, taking at least one minute for the color to develop. It is best to record absorbance readings no ter a specific amount of time has elapsed, between two and four minutes after preparing the equilibrium mixture. Do not wait much longer than four minutes to take readings, however, because the mixture is light sensitive and the FeSCN-ions will slowly decompose. series of solutions will prepared that have varied concentrations of the Fe' ions and Second, a new series of solutions will prepared that have varied concentrat the SCN ions, with a constant concentration of H ions. The concentrations o be comparable in concentra results of this test equilibrium constant for this reaction. f Fe" and SCN will tion with neither species in vast excess over the other. You will use the to accurately evaluate the equilibrium concentrations of each species, and thus the

CLST 2090 Chapter : Astronomy Final

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