Q: What is the frequency of light (in $$\mathrm{s$$^{-1}$$}) $$emitted for a photon with a wavelength of $$120\ \mathrm{nm}$$? Use $$c = 3.00 \times 10^8$\ \mathrm{m/s}.$$

$$2.50 \times 10$$^{15}$$\ \mathrm{s$$^{-1}$$}$$

Q: Calculate the change in energy (in J) for an electron in a hydrogen atom transitioning from $$n=2 to$$ $$n=5. $$Use $$\Delta E = -2.18 \times 10$$^{-18}$$\ \mathrm{J} \left( \frac{1}{n_f^2$} - \frac{1}{n_i^2$} \right).$$

$$+4.58 \times 10$$^{-19}$$\ \mathrm{J}$$

Question 1

Which law is demonstrated by the fact that hydrogen and oxygen can form both H2O (O:H mass ratio = 8:1) and H2O2 (O:H mass ratio = 16:1)?

Accepted Answer

Law of multiple proportions

Question 2

Arrange the following elements in order of increasing metallic character: Na, K, Rb, Cs.

Accepted Answer

Na \u003c K \u003c Rb \u003c Cs

Question 3

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number

Question 4

What is the frequency of light (in $$\mathrm{s$$^{-1}$$}) $$emitted for a photon with a wavelength of $$120\ \mathrm{nm}$$? Use $$c = 3.00 	imes 10^8$\ \mathrm{m/s}.$$

Accepted Answer

$$2.50 	imes 10$$^{15}$$\ \mathrm{s$$^{-1}$$}$$

Question 5

Which of the following pairs are isotopes?

Accepted Answer

$$^{12}_6\mathrm{C}$$ and $$^{13}_6\mathrm{C}$$

Question 6

Which of the following contains an ionic bond?

Accepted Answer

NaCl

Question 7

Which statement about electromagnetic radiation is correct?

Accepted Answer

As the energy decreases, the frequency decreases.

Question 8

Calculate the change in energy (in J) for an electron in a hydrogen atom transitioning from $$n=2 to$$ $$n=5. $$Use $$\Delta E = -2.18 	imes 10$$^{-18}$$\ \mathrm{J} \left( \frac{1}{n_f^2$} - \frac{1}{n_i^2$} ight).$$

Accepted Answer

$$+4.58 	imes 10$$^{-19}$$\ \mathrm{J}$$

Question 9

Which atom’s valence electrons experience the greatest effective nuclear charge?

Accepted Answer

Cl

Question 10

What is the maximum number of electrons that can fit in a d subshell?

Accepted Answer

10

Question 11

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

Accepted Answer

Thomson's cathode ray tube experiment

Question 12

Which of the following sets contains species with the same number of electrons?

Accepted Answer

Cl$$^{-}$$, Ar, Ca$$^{2+}$$

Question 13

Which subatomic particle has the smallest mass?

Accepted Answer

Electron

Question 14

What is the empirical formula for glucose, given its chemical structure in the image?

Accepted Answer

CH$$_2O$$

Question 15

Which element has the electron configuration $$1s^22s^22$p^63s^23$p^64s^23$d^{10}4p^2$?

Accepted Answer

Ge

Question 16

Which of the following occurs as the energy of a photon increases?

Accepted Answer

The wavelength gets shorter

Question 17

A 24.0 g sample of which element contains the greatest number of atoms: N, B, C, or O?

Accepted Answer

C

Question 18

Which of the following elements is a halogen?

Accepted Answer

Br

Question 19

Place the following elements in order of increasing atomic radius: O, Si, Al.

Accepted Answer

O \u003c Si \u003c Al

Question 20

Which orbital would an electron be closest to the nucleus on average?

Accepted Answer

3s

CHEM 118 Exam 1A Study Guidance – General Chemistry Concepts

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