Q: A bomb calorimeter with a heat capacity of $$11.3\ \mathrm{kJ\ ^\circ C$$^{-1}$$} is $$used to combust a sample, causing a temperature rise of $$2.19\ ^\circ C. $$What is the heat released by the reaction?

$$q = C \Delta T = 11.3 \times 2.19 = 24.75\ \mathrm{kJ}$$

Question 1

Which of the following statements about hybridization is CORRECT?

Accepted Answer

An sp$$^2$$ hybridized carbon atom has a trigonal planar geometry.

Question 2

A sample of magnesium nitrate, Mg(NO$$_3$$)$$_2$$, is dissolved in water. Which of the following correctly represents the dissociation of this salt in aqueous solution?

Accepted Answer

$$\mathrm{Mg(NO_3$)_2 (aq) \rightarrow Mg$$^{2+}$$ (aq) + 2NO_3^- (aq)}$$

Question 3

Which of the following is the correct set of quantum numbers for the last electron added to form the K$$^+$$ ion from the K atom?

Accepted Answer

$$n = 4,\ l = 0,\ m_l = 0,\ m_s = -1/2$$

Question 4

A 0.500 mol sample of an ideal gas occupies 22.0 grams at a pressure of 3.00 bar and a temperature of 300.0 K. What is the molar mass of the gas?

Accepted Answer

$$M = \frac{22.0\ \mathrm{g}}{0.500\ \mathrm{mol}} = 44.0\ \mathrm{g\ $$mol^{-1}$$}$$

Question 5

Which of the following best explains why the effective nuclear charge experienced by a valence electron is less than the actual nuclear charge?

Accepted Answer

Valence electrons are shielded from the nucleus by inner electrons.

Question 6

Given the reaction: $$\mathrm{CH_4$(g) + 2O_2(g) \rightarrow CO_2$(g) + 2H_2O(l)}$$ with $$\Delta H = -890.3\ \mathrm{kJ}$$, how much heat is released when 16.04 grams of methane is combusted?

Accepted Answer

$$-890.3\ \mathrm{kJ}$$

Question 7

Which of the following is the correct balanced equation for the precipitation reaction between AgNO$$_3$$ and NaCl in aqueous solution?

Accepted Answer

$$\mathrm{$$AgNO_3$$(aq) + NaCl(aq) \rightarrow AgCl(s) + $$NaNO_3$$(aq)}$$

Question 8

Which of the following statements about the molecular geometry of water is correct?

Accepted Answer

Water has a bent geometry due to two lone pairs on the oxygen atom.

Question 9

A bomb calorimeter with a heat capacity of $$11.3\ \mathrm{kJ\ ^\circ C$$^{-1}$$} is $$used to combust a sample, causing a temperature rise of $$2.19\ ^\circ C. $$What is the heat released by the reaction?

Accepted Answer

$$q = C \Delta T = 11.3 	imes 2.19 = 24.75\ \mathrm{kJ}$$

Question 10

Which of the following is the correct electron configuration for the ground state of nitrogen (N)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^3$$

Question 11

Which of the following best describes the process of hybridization?

Accepted Answer

The mixing of atomic orbitals to form new, equivalent hybrid orbitals.

Question 12

Which of the following is the correct formula for calculating the root mean square speed ($$u_{rms}) of a $$gas molecule at temperature $$T$$?

Accepted Answer

$$u_{rms} = \sqrt{\frac{3RT}{M}}$$

Question 13

Which of the following is the correct oxidation number for sulfur in SO$$_2$$?

Accepted Answer

+4

Question 14

Which of the following statements about the stability of benzene is TRUE?

Accepted Answer

The stability of benzene is a major function of delocalized $$\pi$$ bonding.

Question 15

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

Accepted Answer

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

Question 16

Which of the following is the correct relationship for the enthalpy change ($$\Delta H) of a $$reaction using Hess's Law?

Accepted Answer

$$\Delta H_{reaction} = \sum \Delta H_{products} - \sum \Delta H_{reactants}$$

Question 17

Which of the following best describes the geometry of an sp$$^3$$ hybridized atom?

Accepted Answer

Tetrahedral

Question 18

Which of the following is the correct formula for the work done by an expanding gas at constant pressure?

Accepted Answer

$$w = -P_{ext} \Delta V$$

Question 19

Which of the following is the correct order of atomic radius for the elements Sb, K, Rh, Al?

Accepted Answer

K \u003e Sb \u003e Rh \u003e Al

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