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13 Dec 2019

If relative atomic mass (Ar) of Cl is 35.45, what is the ratio of 35Cl:37Cl present in a sample of Cl atoms containing naturally occuring Cl? (The answer is 3.17:1 but I don't know how the answer was obtained. Please workout out the solution and post it ASAP)

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17 Dec 2019
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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

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

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D:1s2 2p6 3d10 4f2

9.Order the following compounds in terms of increasingpolarity.

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A. 8 D: 40

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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! =)

please answer the following:

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- Calculate the molar mass of penicillin G.

-How many moles of penicillin are in a 91.7 mg sample?

- How many carbon atoms are in a 91.7 mg sample?

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home / study / science / physics / questions and answers / a living specimen in equilibrium with the atmosphere ... Your question has been answered! Rate it below. Let us know if you got a helpful answer. Question A living specimen in equilibrium with the atmosphere contains one atom of 14C (half-life = 5730 yr) for every 7.70 *10^11 stable carbon atoms. A bone fragment contains 1.00*10^21 carbon nuclei. When the sample is placed inside a shielded beta counter with 75.0% counting efficiency, 82,000 counts are accumulated in one year. Assuming that the cosmic-ray flux and the Earth's atmosphere have not changed appreciably since the sample was formed, find the age of the sample. I know the answer is 2993 years, but don't know why. Please explain! THANK YOU!

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