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18 Dec 2019

Problem 6.43

One of the emission lines of the hydrogen atom has a wavelength of 93.07 nm.

Part A

In what region of the electromagnetic spectrum is this emission found?

X-ray region
ultraviolet region
visible region
infrared region

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Correct

Part B

Determine the initial value of n associated with this emission.

Express your answer as an integer.
ni=

5

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Part C

Determine the final value of n associated with this emission.

Express your answer as an integer.

nf =

1

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Related questions

One of the emission lines of the hydrogen atom has a wavelength of 93.07 nm. (a) In what region of the electromagnetic spectrum is this emission found? (b) Determine the initial and final values of n associated with this emission.

Part B

2

Express your answers as an integer. Enter your answers in ascending order separated by commas.
l =

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Part C

3

Express your answers as an integer. Enter your answers in ascending order separated by commas.
l =

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Incorrect; Try Again; 6 attempts remaining

Part D

4

Express your answers as an integer. Enter your answers in ascending order separated by commas.
l =

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Part D

What is the value of n for the level to which the electron relaxed?

Express your answer as an integer.
n =

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Part E

For the n=4 level, list all the possible values of l.

Express your answer as an integer. (If there is more than one, separate the integers by commas in ascending order.)

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Part F

If the laser is pointed toward a pinhole with a diameter of 1.1 mm, how many photons travel through the pinhole per second? Assume that the light intensity is equally distributed throughout the entire cross-divisional area of the beam. (1 W = 1 J/s)

Express your answer using two significant figures.
N = photons/s

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Problem 3.63

Several brands of antacids use Al(OH)3 to react with stomach acid, which contains primarily HCl: αAl(OH)3(s)+βHCl(aq)→γAlCl3(aq)+δH2O(l)

Part A

Balance this equation.

Express your answer as a balanced chemical equation. Identify all of the phases in your answer.

Al(OH)3+3HCl→AlCl3+3H2O

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Part B

Calculate the number of grams of HCl that can react with 0.490 g of Al(OH)3.
m =

.77

 g

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Part C

Calculate the number of grams of AlCl3 formed when 0.490 g of Al(OH)3 reacts.
m =

0.34

 g

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Part D

Calculate the number of grams of H2O formed when 0.490 g of Al(OH)3 reacts.
m =

.77

 g

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Problem 4.71

Indicate the concentration of each ion or molecule present in the following solutions.

Part A

0.25 M NaNO3

Express your answer numerically using two significant figures. If there is more than one answer, separate them by a comma.

0.25,0.25

 M

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Part B

1.7×10−2M MgSO4

Express your answer numerically using two significant figures. If there is more than one answer, separate them by a comma.

1.3,1.3

 M

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Part C

2.00×10−2M C6H12O6

Express your answer numerically using three significant figures. If there is more than one answer, separate them by a comma.
M

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Part D

A mixture of 45.0mL of 0.272M NaCl and 65.0mL of 0.0247M (NH4)2CO3. Assume that the volumes are additive.

Express your answer numerically using three significant figures. If there is more than one answer, separate them by a comma.

0.0146,0.111,0.0292,0.0146

 M

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Problem 4.73

Part A

You have a stock solution of 16.0 M NH3. How many milliliters of this solution should you dilute to make 1250 mL of 0.280 M NH3?
V = mL

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Part B

If you take a 10.0-mL portion of the stock solution and dilute it to a total volume of 0.450 L , what will be the concentration of the final solution?
M =

0.022

 M

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