Q: A chemist needs to convert 5.00 meters to centimeters. What is the correct conversion?

$5.00\ \mathrm{m} \times 100\ \mathrm{cm}/\mathrm{m} = 500\ \mathrm{cm}$

Q: The speed of light ($c$) is a fundamental constant in quantum mechanics. What is its value?

$3.00 \times 10^8\ \mathrm{m/s}$

Q: If the wavelength of a photon is $500\ \mathrm{nm}$, what is its frequency? (Use $c = 3.00 \times 10^8\ \mathrm{m/s}$)

$\nu = \frac{c}{\lambda} = \frac{3.00 \times 10^8}{500 \times 10^{-9}} = 6.00 \times 10^{14}\ \mathrm{Hz}$

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

$E = \frac{hc}{\lambda} = \frac{6.626 \times 10^{-34} \times 3.00 \times 10^8}{589 \times 10^{-9}} = 3.37 \times 10^{-19}\ \mathrm{J}$

Question 1

Which of the following is the correct SI unit for measuring mass?

Accepted Answer

kilogram (kg)

Question 2

A student measures the temperature of a solution as 25°C. What is this temperature in Kelvin?

Accepted Answer

$25 + 273.15 = 298.15\ \mathrm{K}$

Question 3

Which of the following measurements contains three significant figures?

Accepted Answer

0.00450

Question 4

A chemist needs to convert 5.00 meters to centimeters. What is the correct conversion?

Accepted Answer

$5.00\ \mathrm{m} 	imes 100\ \mathrm{cm}/\mathrm{m} = 500\ \mathrm{cm}$

Question 5

Which experiment provided evidence for the existence of the electron?

Accepted Answer

Cathode ray experiment (J.J. Thomson)

Question 6

What is the atomic number of an element with 17 protons?

Accepted Answer

17

Question 7

Which statement best describes isotopes?

Accepted Answer

Atoms with the same number of protons but different numbers of neutrons

Question 8

Which scientist is credited with the gold foil experiment that led to the discovery of the atomic nucleus?

Accepted Answer

Ernest Rutherford

Question 9

Given the atomic symbol $^{14}_{6}\mathrm{C}$, how many neutrons does this isotope of carbon have?

Accepted Answer

$14 - 6 = 8$ neutrons

Question 10

Which of the following best describes the periodic table?

Accepted Answer

A chart that organizes elements by increasing atomic number and recurring chemical properties

Question 11

The speed of light ($c$) is a fundamental constant in quantum mechanics. What is its value?

Accepted Answer

$3.00 	imes 10^8\ \mathrm{m/s}$

Question 12

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

Accepted Answer

$E = h 
u$

Question 13

If the wavelength of a photon is $500\ \mathrm{nm}$, what is its frequency? (Use $c = 3.00 	imes 10^8\ \mathrm{m/s}$)

Accepted Answer

$
u = \frac{c}{\lambda} = \frac{3.00 	imes 10^8}{500 	imes 10^{-9}} = 6.00 	imes 10^{14}\ \mathrm{Hz}$

Question 14

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number ($l$)

Question 15

Which principle states that no two electrons in an atom can have the same set of four quantum numbers?

Accepted Answer

Pauli exclusion principle

Question 16

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

Accepted Answer

$E = \frac{hc}{\lambda} = \frac{6.626 	imes 10^{-34} 	imes 3.00 	imes 10^8}{589 	imes 10^{-9}} = 3.37 	imes 10^{-19}\ \mathrm{J}$

Question 17

Which of the following statements about the Heisenberg uncertainty principle is correct?

Accepted Answer

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

Question 18

Which quantum number specifies the orientation of an orbital in space?

Accepted Answer

Magnetic quantum number ($m_l$)

Question 19

A sample contains $6.022 	imes 10^{23}$ atoms of iron. What is the mass of the sample? (Molar mass of iron = $55.85\ \mathrm{g/mol}$)

Accepted Answer

$55.85\ \mathrm{g}$

Question 20

Which of the following is NOT a correct statement about the periodic table?

Accepted Answer

Elements are arranged by alphabetical order.

General Chemistry Study Notes: Essentials, Atoms, and Quantum-Mechanical Model

Study Guide - Practice Questions

Study Guide - Flashcards