Q: Which orbital-filling diagram represents the ground state of oxygen?

$[\text{He}]\ \uparrow\downarrow\ 2s\ \uparrow\ 2p_x\ \uparrow\ 2p_y\ \uparrow\downarrow\ 2p_z$

Question 1

A solution contains 0.736 M KBr. What volume of this solution is needed to provide 303.6 g of KBr? (Molar mass of KBr = 119.0 g/mol)

Accepted Answer

$2.12\ 	ext{L}$

Question 2

How many electrons are in the ion $	ext{PO}_4^{3-}$?

Accepted Answer

$50$

Question 3

Using the VSEPR model, what is the molecular geometry of the central atom in $	ext{BF}_3$?

Accepted Answer

Trigonal planar

Question 4

Which of the following molecules has the weakest bonds?

Accepted Answer

$	ext{Cl}_2$

Question 5

How many electrons are in the outermost shell of the $	ext{Ca}^{2+}$ ion in its ground state?

Accepted Answer

$0$

Question 6

Which of the following pairs have the same number of valence electrons?

Accepted Answer

$	ext{Li}$, $	ext{Na}$

Question 7

A mixture of Xe, Kr, and Ar has a total pressure of 670 atm. What is the mole fraction of Kr if the partial pressures of Xe and Ar are 140 atm and 280 atm, respectively?

Accepted Answer

$0.373$

Question 8

A solution of LiCl in water is 0.27 M. What is the mole fraction of LiCl?

Accepted Answer

$0.0048$

Question 9

Calculate the work energy, $w$, gained or lost by the system when a gas expands from 15.1 L to 35.1 L against a constant external pressure of 1.5 atm. $[1\ 	ext{L} \cdot 	ext{atm} = 101\ 	ext{J}]$

Accepted Answer

$-3.03\ 	ext{kJ}$

Question 10

What is the molar concentration of sodium ions in a $0.450\ 	ext{M}$ $	ext{Na}_3	ext{PO}_4$ solution?

Accepted Answer

$1.35\ 	ext{M}$

Question 11

A solution is 2.25% by weight $	ext{NaHCO}_3$. How many grams of $	ext{NaHCO}_3$ are in 150.0 g of solution?

Accepted Answer

$3.38\ 	ext{g}$

Question 12

Which orbital-filling diagram represents the ground state of oxygen?

Accepted Answer

$[	ext{He}]\ \uparrow\downarrow\ 2s\ \uparrow\ 2p_x\ \uparrow\ 2p_y\ \uparrow\downarrow\ 2p_z$

Question 13

The pressure exerted by 15.0 mL of gas in a 3.1 L flask at 22°C is ______ kPa.

Accepted Answer

$19.0$

Question 14

A gas originally at 27°C and 1.00 atm pressure in a 3.91 L flask is cooled at constant pressure until the temperature is 11°C. The new volume of the gas is ______.

Accepted Answer

$3.70\ 	ext{L}$

Question 15

Which compound has the highest boiling point?

Accepted Answer

$	ext{HF}$

Question 16

At 298 K the average kinetic energy is the same for He, H$_2$, and N$_2$. The gas with the highest average velocity is ______.

Accepted Answer

$	ext{He}$

Question 17

How many of the following molecules are polar? $	ext{XeCl}_2$, $	ext{CO}_2$, $	ext{PCl}_3$, $	ext{SF}_4$

Accepted Answer

$3$

Question 18

A balloon contains 0.76 mol N$_2$, 0.18 mol O$_2$, 0.031 mol He and 0.026 mol H$_2$ at 770 mm Hg. What is the partial pressure of O$_2$?

Accepted Answer

$130\ 	ext{mm Hg}$

Question 19

What type of bonding is found in the compound OF$_2$?

Accepted Answer

Covalent bonding

General Chemistry: Comprehensive Study Guide (Exam-Style Questions and Concepts)

Study Guide - Practice Questions

Study Guide - Flashcards