Question 1

Which of the following elements has the greatest number of valence electrons?

Accepted Answer

Neon (Ne)

Question 2

According to the Pauli exclusion principle, which statement is correct regarding electrons in an atom?

Accepted Answer

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

Question 3

Which electron configuration represents the ground state of oxygen (O)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^4$$

Question 4

Which of the following elements is most likely to be diamagnetic?

Accepted Answer

Zn (Zinc)

Question 5

Which statement best explains why electrons in different orbitals are more shielded than those in the same orbital?

Accepted Answer

Electrons in different orbitals experience greater electron-electron repulsion, increasing shielding.

Question 6

Which quantum numbers are needed to uniquely identify an electron in an atom?

Accepted Answer

$$n,\ l,\ m_l,\ m_s$$

Question 7

Which of the following best describes Hund's rule?

Accepted Answer

Electrons fill degenerate orbitals singly before pairing.

Question 8

Which element has the highest first ionization energy?

Accepted Answer

Fluorine (F)

Question 9

Which of the following transitions in the hydrogen atom emits the highest energy photon?

Accepted Answer

$$n=3 \rightarrow n=1$$

Question 10

A student mixes 50.0 mL of 0.200 M HCl with 50.0 mL of 0.200 M NaOH. What is the final concentration of NaCl in the solution?

Accepted Answer

$$0.100\ \mathrm{M}$$

Question 11

Which of the following is a correct net ionic equation for the reaction between aqueous solutions of AgNO$$_3$$ and NaCl?

Accepted Answer

$$\mathrm{Ag^+ (aq) + Cl^- (aq) \rightarrow AgCl (s)}$$

Question 12

Which of the following is the correct formula for calculating the energy of a photon?

Accepted Answer

$$E = h 
u$$

Question 13

Which of the following acids is considered a strong acid?

Accepted Answer

HNO$$_3$$

Question 14

What is the molar mass of Ca(NO$$_3$$)$$_2$$?

Accepted Answer

$$164.10\ \mathrm{g/mol}$$

Question 15

Which of the following is the oxidizing agent in the reaction: $$2\mathrm{Na} + 2\mathrm{H_2O} \rightarrow 2\mathrm{NaOH} + \mathrm{H_2$}$$?

Accepted Answer

$$\mathrm{H_2O}$$

Question 16

A solution is prepared by dissolving 5.00 g of NaCl in enough water to make 250.0 mL of solution. What is the molarity of the solution? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

$$0.342\ \mathrm{M}$$

Question 17

Which of the following best describes the difference between a molecular equation and a net ionic equation?

Accepted Answer

A molecular equation shows all reactants and products as compounds, while a net ionic equation shows only the species that actually change during the reaction.

Question 18

Which of the following is the correct formula for calculating the heat of reaction ($$q) $$using specific heat capacity ($$c$$), mass ($$m$$), and temperature change ($$\Delta T$$)?

Accepted Answer

$$q = mc\Delta T$$

Question 19

Which of the following best describes the Aufbau principle?

Accepted Answer

Electrons fill the lowest energy orbitals first before occupying higher energy orbitals.

Question 20

Which of the following is the correct balanced molecular equation for the reaction between H$$_2SO$_4$$ and Ba(OH)$$_2$$?

Accepted Answer

$$\mathrm{H_2SO_4 (aq) + Ba(OH)_2 (aq) \rightarrow $$BaSO_4$$ (s) + 2H_2O (l)}$$

General Chemistry I: Study Guide for Exam 2 – Atomic Structure, Periodicity, Chemical Reactions, and Thermochemistry

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