Question 1

Which experiment is illustrated in the second image, and what was its major conclusion about atomic structure?

Accepted Answer

The Rutherford gold foil experiment; it concluded that the mass of an atom is concentrated in a very small space (the nucleus).

Question 2

Referencing the periodic table in the third image, which element has the highest first ionization energy?

Accepted Answer

Helium

Question 3

Which of the following compounds contains an ionic bond?

Accepted Answer

KOH

Question 4

A photon with a wavelength of 150 nm is incident on a material with a binding energy of $3.62 	imes 10^{-19}$ J. Will it eject an electron? Use $E = \frac{hc}{\lambda}$ with $h = 6.626 	imes 10^{-34}$ J·s and $c = 3.00 	imes 10^8$ m/s.

Accepted Answer

Yes, because its energy is greater than the binding energy.

Question 5

Which element has the largest atomic radius among Phosphorus, Barium, and Chlorine?

Accepted Answer

Barium

Question 6

Which bond has the largest difference in electronegativity?

Accepted Answer

F–F

Question 7

What is the electron configuration for the chloride ion ($^{35}	ext{Cl}^-$)?

Accepted Answer

$1s^2 2s^2 2p^6 3s^2 3p^6$

Question 8

Which electronic transition in a hydrogen atom will emit a photon with the least amount of energy?

Accepted Answer

n = 4 to n = 3

Question 9

If an electron in a hydrogen atom transitions from a 2p orbital to a 5s orbital, what is the wavelength of the photon absorbed? Use $E = -2.18 	imes 10^{-18} \left( \frac{1}{n_f^2} - \frac{1}{n_i^2} ight)$ and $E = \frac{hc}{\lambda}$.

Accepted Answer

The wavelength is approximately $1094$ nm.

Question 10

Which of the following is the correct formula for aluminum phosphate?

Accepted Answer

AlPO4

Question 11

Which element has the greatest electron affinity among Argon, Chlorine, and Neon?

Accepted Answer

Chlorine

Question 12

What is the mass (in g/mol) of the other silver isotope if Ag-109 (108.91 g/mol) is 48.16% and the average atomic mass is 107.87 g/mol?

Accepted Answer

106.90 g/mol

Question 13

Which photon from the following wavelengths will NOT eject an electron from a material with a binding energy of $3.62 	imes 10^{-19}$ J? (Photon 1: 1077 nm, Photon 2: 233 nm, Photon 3: 150 nm, Photon 4: 555 nm)

Accepted Answer

Photon 1 (1077 nm)

Question 14

Which of the following best describes the result of the double-slit experiment shown in the first image?

Accepted Answer

Photons exhibit both wave and particle properties, resulting in interference patterns.

Question 15

Which of the following is the correct electron configuration for copper(I) ion ($	ext{Cu}^+$)?

Accepted Answer

$[	ext{Ar}] 3d^{10}$

Question 16

Which of the following is a plausible reason why the periodic table is arranged in its current form?

Accepted Answer

To group elements by their chemical properties and electron configurations.

Question 17

Which of the following molecules is NOT ionic?

Accepted Answer

CO

Question 18

What is the correct formula for potassium carbonate?

Accepted Answer

K2CO3

Question 19

Which experiment determined the mass-to-charge ratio of the electron?

Accepted Answer

Thomson cathode ray experiment

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