Q: Which of the following best describes the relationship between the frequency $(\nu)$ and wavelength $(\lambda)$ of electromagnetic radiation?

$\nu$ is inversely proportional to $\lambda$

Question 1

When a system gives off heat and does work, the change in internal energy $\Delta E$ is always negative. Which of the following best explains this?

Accepted Answer

The system gives off heat and does work.

Question 2

For the combustion reaction of methane, $\Delta H_f^\circ$ is zero for which of the following substances?

Accepted Answer

O$_2$(g)

Question 3

The value of $\Delta H^\circ$ for the reaction below is $-126$ kJ. How many kJ are released when $2.00$ mol of NaOH is formed in the reaction?

$2	ext{Na}_2	ext{O}_2 (s) + 2	ext{H}_2	ext{O} (l) ightarrow 4	ext{NaOH} (s) + 	ext{O}_2 (g)$

Accepted Answer

$63$

Question 4

Which of the quantum number(s) below represent the principal quantum number?

Accepted Answer

n only

Question 5

Given the following data, what is $\Delta H$ for the reaction: $	ext{IF}_5 (s) ightarrow 	ext{IF}_3 (g) + 	ext{F}_2 (g)$?

$	ext{IF} (g) + 2	ext{F}_2 (g) ightarrow 	ext{IF}_5 (g)$, $\Delta H = -390$ kJ
$	ext{IF} (g) + 2	ext{F}_2 (g) ightarrow 	ext{IF}_3 (g)$, $\Delta H = -745$ kJ

Accepted Answer

$+355$ kJ

Question 6

Which of the following is NOT a valid set of four quantum numbers $(n, l, m_l, m_s)$?

Accepted Answer

$0, 2, 0, +1/2$

Question 7

Which of the following types of radiation has the shortest wavelength?

Accepted Answer

Ultraviolet

Question 8

The energy of a photon of light is ______ proportional to its frequency and ______ proportional to its wavelength.

Accepted Answer

Directly, inversely

Question 9

The ground-state electron configuration of fluorine is:

Accepted Answer

$[	ext{He}]2s^2 2p^5$

Question 10

Which of the following best describes the relationship between the frequency $(
u)$ and wavelength $(\lambda)$ of electromagnetic radiation?

Accepted Answer

$
u$ is inversely proportional to $\lambda$

Question 11

A chemical reaction releases $355$ kJ of energy. What is the sign of $\Delta H$ for this reaction?

Accepted Answer

Negative

Question 12

Which of the following elements has a standard enthalpy of formation $\Delta H_f^\circ$ of zero?

Accepted Answer

O$_2$(g)

Question 13

Which quantum number determines the shape of an orbital?

Accepted Answer

Angular momentum quantum number ($l$)

Question 14

If a system absorbs heat and has work done on it, what is the sign of $\Delta E$?

Accepted Answer

Always positive

Question 15

Which of the following is a correct electron configuration for an atom in its ground state?

Accepted Answer

$1s^2 2s^2 2p^5$

Question 16

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

Accepted Answer

Magnetic quantum number ($m_l$)

Question 17

Which of the following statements about the energy of electromagnetic radiation is correct?

Accepted Answer

Energy increases as frequency increases.

Question 18

Which of the following is the correct set of quantum numbers for a 2p electron?

Accepted Answer

$n=2, l=1, m_l=0, m_s=+1/2$

Question 19

Which of the following is a correct statement about the principal quantum number ($n$)?

Accepted Answer

It determines the energy level of the electron.

Question 20

Which of the following is true for a system that absorbs heat and does work?

Accepted Answer

$\Delta E$ can be positive or negative depending on the magnitudes.

General Chemistry Study Notes: Thermochemistry, Quantum Numbers, and Atomic Structure

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