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Question 44211

posted 9 months ago

A. Write a set of four possible quantum numbers for the circled electron. (There could bemore than one correct answer.) (4 points)
n =| =m, =II
B. The electron in a hydrogen atom can undergo a transition from n = 6 to n = 1, emitting aphoton with energy 2.11 x 10-18 J. (2 points)
i. What is the frequency of this transition? (1 point)
ii. How does this transition show that the energy of a photon is quantized? (1 point)
C. Why is it impossible for an electron to have the quantum numbers n = 3, | = 0, m, = 1, m, =
+\frac{1}{2} ?(2 \text { points })

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Question 44210

posted 9 months ago

Even though it may be popular for kids to talk about "nuking" their lunch in the microwave,microwave ovens do not use nuclear radiation. Fill in the remaining parts of the table to compare a microwave with an ultraviolet wave. (8 points)
A. A highway worker (who took chemistry in high school) was instructed to replace all the red lightbulbs in the traffic signals with new LED bulbs. However, the boxes containing red,yellow, and green bulbs were marked only as follows:
Bulb A: 5.08 x 1014 Hz
Bulb B: 5.94 × 1014 Hz
Bulb C: 4.79 x 1014 Hz
i. Put the boxes of bulbs in order of increasing energy. (3 points)
ii. Which box should contain the red bulbs? Explain your answer.(3 points)

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Question 44213

posted 9 months ago

A. What two competing fundamental forces are at work inside the nucleus of an atom? (1point)
B. How can the ratio of number of protons to neutrons in the nucleus be used to predict thestability of a nucleus? (2 points)
C. How much energy would be released if 0.00023 kg of plutoniumthrough radioactive decay? (2 points)were converted to energy

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Question 44212

posted 9 months ago

Use the emission spectra shown to answer the following questions (note the direction of thewavelength scale):
A. A high school student acquired an emission spectrum of an unknown sample. He knewthe unknown sample contained one of the elements, whose spectra are shown above. Theemission spectrum of his sample showed a strong emission at 610 nm but not at 480 nm.Which element did his unknown sample contain? (2 points)
B. Element A above has a strong emission around 670 nm. Does this emission line representa lower energy or higher energy transition than the emission line at 428 nm? Explain youranswer. (2 points)
C. Why does each element have its own unique emission spectrum? (2 points)

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Question 44214

posted 9 months ago

A. Name three kinds of radioactive decay and provide the symbol for each that is used to represent the product given off. (3 points)
\text { i. } a \text { - decay (1 point) }
\text { ii. } \beta \text { - decay (1 point) }
\text { iii. Y - decay (1 point) }
{ }_{1}^{2} \mathrm{H}+{ }_{1}^{2} \mathrm{H} \rightarrow \frac{3}{2} \mathrm{He}+{ }_{0}^{1} \mathrm{n}

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Question 44215

posted 9 months ago

A lab technician had a sample of radioactive Americium. He knew it was one of the isotopeslisted in the table below but did not know which one. The sample originally contained 0.008g of the isotope, but 120 minutes later it contained 0.004 g. Use this information to answerthe following questions. (3 points)
A. How many half-lives have passed?
B. What is the half-life of the sample?
C. Which isotope did he have? (

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Question 45005

posted 10 months ago

(12). A metal cube has an edge length of 2.44 cm and a mass of 16.28 g. Calculate the density of the metal.

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Question 45007

posted 10 months ago

(18). Find the mass of a metal object (in grams) that was heated to 105°C and placed in 27 g of water at 13°C The final temperature of the water is 40°C. The C water = 4.184 J/g°C and C metal = 0.184 J/g°C.

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Question 45008

posted 10 months ago

(20). After completing a titration, you determined 0.52 mol of sodium hydroxide were required to reach the endpoint of sulfuric acid sample of unknown concentration. Your acid sample was 45 mL. What is the concentration of your acid? (Hint: is the reaction balanced?)
\mathrm{H} 2 \mathrm{SO} 4(\mathrm{aq})+\mathrm{NaOH}(\mathrm{aq}) \rightarrow \mathrm{Na2SO4}(\mathrm{aq})+\mathrm{H} 2 \mathrm{O}(1)

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Question 45006

posted 10 months ago

(17). Determine the molarity of a solution formed by dissolving 48.9 g LiBr in enough water to yield a total solution volume of 750.0 mL.

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