Q: A sodium lamp emits yellow light with a wavelength of $$589\ \mathrm{nm}. $$What is the energy of a single photon of this light? ($$h = 6.626 \times 10$$^{-34}$$\ \mathrm{J\cdot s}$$, $$c = 3.00 \times 10^8$\ \mathrm{m/s})$$

$$3.38 \times 10$$^{-19}$$\ \mathrm{J}$$

Question 1

Which of the following experimental observations provided the strongest evidence for the existence of the atomic nucleus?

Accepted Answer

The large-angle scattering of alpha particles by thin gold foil

Question 2

Which equation correctly relates the energy of a photon to its frequency?

Accepted Answer

$$E = h 
u$$

Question 3

A sodium lamp emits yellow light with a wavelength of $$589\ \mathrm{nm}. $$What is the energy of a single photon of this light? ($$h = 6.626 	imes 10$$^{-34}$$\ \mathrm{J\cdot s}$$, $$c = 3.00 	imes 10^8$\ \mathrm{m/s})$$

Accepted Answer

$$3.38 	imes 10$$^{-19}$$\ \mathrm{J}$$

Question 4

Which of the following best describes the Heisenberg Uncertainty Principle?

Accepted Answer

It is impossible to know both the exact position and exact momentum of a particle simultaneously.

Question 5

Which set of quantum numbers is NOT allowed for an electron in an atom?

Accepted Answer

$$n=2,\ l=2,\ m_l=0,\ m_s=+\frac{1}{2}$$

Question 6

Which of the following elements has the highest first ionization energy?

Accepted Answer

Neon ($$\mathrm{Ne})$$

Question 7

Which of the following statements about ionic and covalent bonds is correct?

Accepted Answer

Ionic bonds involve the transfer of electrons from one atom to another, while covalent bonds involve the sharing of electrons.

Question 8

Which of the following molecules is nonpolar, despite having polar bonds?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 9

A molecule has the following Lewis structure: $$\mathrm{O=C=O}. $$What is the molecular geometry and bond angle?

Accepted Answer

Linear, $$180^\circ$$

Question 10

Which of the following best explains why water ($$\mathrm{H_2O}) $$has a bent molecular geometry?

Accepted Answer

The two lone pairs on oxygen repel the bonding pairs, resulting in a bent shape.

Question 11

Which of the following species has resonance structures?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 12

Which of the following is the correct electron configuration for the ground state of phosphorus ($$Z=15$$)?

Accepted Answer

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

Question 13

Which of the following best describes the concept of electronegativity?

Accepted Answer

The ability of an atom in a molecule to attract shared electrons to itself.

Question 14

Which of the following molecules has a dipole moment?

Accepted Answer

$$\mathrm{HCl}$$

Question 15

Which of the following statements about hybridization is correct?

Accepted Answer

The central atom in methane ($$\mathrm{CH_4$}) is$$ $$sp^3$$ hybridized.

Question 16

Which of the following best explains why sodium chloride ($$\mathrm{NaCl}) $$conducts electricity when dissolved in water but not as a solid?

Accepted Answer

In aqueous solution, ions are free to move and carry charge, but in the solid state, ions are fixed in place.

Question 17

Which of the following is the correct order of increasing atomic radius?

Accepted Answer

$$\mathrm{Li} \u003c \mathrm{Na} \u003c \mathrm{K}$$

Question 18

A sample of gas is compressed from $$2.0\ \mathrm{L} to$$ $$1.0\ \mathrm{L} at $$constant temperature. According to Boyle's Law, what happens to the pressure?

Accepted Answer

It doubles

Question 19

Which of the following best describes the Pauli Exclusion Principle?

Accepted Answer

No two electrons in the same atom can have the same set of four quantum numbers.

Question 20

Which of the following is a correct application of VSEPR theory?

Accepted Answer

Methane ($$\mathrm{CH_4$}) $$has a tetrahedral geometry with bond angles of $$109.5^\circ.$$

General Chemistry I: Structure and Properties – Course Syllabus and Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard