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

$$+4.58 \times 10$$^{-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 describes 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 atom’s valence electrons experience the greatest effective nuclear charge?

Accepted Answer

Cl

Question 8

Calculate the average atomic mass of an element with isotopes of masses $$62.929601\ \mathrm{amu} (69.17$$%) and $$64.927794\ \mathrm{amu} (30.83$$%).

Accepted Answer

$$63.55\ \mathrm{amu}$$

Question 9

What is the empirical formula of glucose, given its molecular formula is $$\mathrm{C_6H_{12}O_6$}$$?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 10

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

Accepted Answer

Thomson's cathode ray tube experiment

Question 11

How many electrons can fit in a d subshell?

Accepted Answer

10

Question 12

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

Accepted Answer

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

Question 13

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

Accepted Answer

The wavelength gets shorter

Question 14

What is the chemical formula for sodium acetate?

Accepted Answer

NaC$$_2H$_3O$_2$$

Question 15

Which of the following elements is a halogen?

Accepted Answer

Br

Question 16

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

Accepted Answer

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

Question 17

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

Accepted Answer

3s

Question 18

Which statement about electromagnetic radiation is correct?

Accepted Answer

As the energy decreases, the frequency decreases.

Question 19

What is the maximum number of electrons that can occupy the 4p subshell?

Accepted Answer

6

Question 20

Which subatomic particle has the smallest mass?

Accepted Answer

Electron

General Chemistry Exam 1A Study Guidance

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