Q: A sample of gas occupies a volume of 414 mL at 0.744 atm and 94.0 °C. Calculate the volume of the gas if the pressure is changed to 0.987 atm while the temperature is held constant.

$$V_2$$ = \frac{$$P_1$$ $$V_1$$}{$$P_2$$} = \frac{0.744 \times 414}{0.987} = 312\ \text{mL}$$

Question 1

Which of the following statements correctly describes the relationship between pressure, volume, and temperature for an ideal gas, according to the combined gas law?

Accepted Answer

If the volume decreases while temperature is held constant, the pressure increases.

Question 2

A sample of gas occupies a volume of 414 mL at 0.744 atm and 94.0 °C. Calculate the volume of the gas if the pressure is changed to 0.987 atm while the temperature is held constant.

Accepted Answer

$$V_2$$ = \frac{$$P_1$$ $$V_1$$}{$$P_2$$} = \frac{0.744 	imes 414}{0.987} = 312\ 	ext{mL}$$

Question 3

Which of the following compounds is insoluble in water according to the solubility rules?

Accepted Answer

AgCl

Question 4

Which of the following is the correct empirical formula for a compound containing 40.0% C, 6.7% H, and 53.3% O by mass?

Accepted Answer

CH$$_2O$$

Question 5

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

Accepted Answer

Cl

Question 6

Which of the following molecules is nonpolar?

Accepted Answer

CO$$_2$$

Question 7

What is the correct electron configuration for Se in its ground state?

Accepted Answer

[Ar]4s$$^23d$^{10}4p$^4$$

Question 8

Which of the following is the correct net ionic equation for the reaction between K$$_2SO$_4$$ and CaCl$$_2 in $$aqueous solution?

Accepted Answer

$$Ca^{2+}(aq$$) + $$SO_4$$^{2-}(aq) \rightarrow $$CaSO_4(s$$)$$

Question 9

Which of the following sets of quantum numbers is allowed for an electron in a 3d orbital?

Accepted Answer

$$n = 3,\ l = 2,\ m_l = 2,\ m_s = +\frac{1}{2}$$

Question 10

Which of the following molecules has a central atom with an expanded octet?

Accepted Answer

SF$$_6$$

Question 11

Which of the following correctly lists the compounds K$$_2S$$, CaS, K$$_2O$$, and CaO in order of increasing lattice energy (least lattice energy listed first)?

Accepted Answer

K$$_2S$$ \u003c K$$_2O$$ \u003c CaO \u003c CaS

Question 12

Which of the following is the correct formula for a gas whose molecules have the highest average speed at 225 K?

Accepted Answer

N$$_2$$

Question 13

Which of the following intermolecular forces must be overcome to convert H$$_2O $$from liquid to gas?

Accepted Answer

London dispersion, dipole-dipole, and hydrogen bonding

Question 14

Which of the following correctly describes the electron-domain geometry and molecular geometry for a molecule with 5 electron domains and 2 lone pairs on the central atom?

Accepted Answer

Electron-domain geometry is trigonal bipyramidal; molecular geometry is T-shaped.

Question 15

Which of the following is the correct hybridization for the central atom in OCl$$_2$$?

Accepted Answer

$$sp^3$$

Question 16

Which of the following correctly lists the three particles K$$^+$$, K, and S$$^{2-} in $$order of increasing EXTACTED size (smallest to largest)?

Accepted Answer

K$$^+$$ \u003c K \u003c S$$^{2-}$$

Question 17

Which of the following is a permissible set of quantum numbers for an electron in a hydrogen atom in an excited state?

Accepted Answer

$$n = 3,\ l = 2,\ m_l = -2,\ m_s = +\frac{1}{2}$$

Question 18

Which of the following statements is correct regarding the solubility of ionic compounds?

Accepted Answer

All compounds containing NO$$_3^-$$ are soluble in water.

Question 19

Which of the following correctly describes the relationship between the boiling points of H$$_2O$$, CH$$_4$$, and CO$$_2$$?

Accepted Answer

H$$_2O$$ \u003e CO$$_2$$ \u003e CH$$_4$$

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