Question 1

A sample of 10 g sodium bicarbonate ($$\mathrm{$$NaHCO_3$$}) $$reacts with excess hydrochloric acid ($$\mathrm{HCl}) at$$ $$1.0$$ atm and $$20\ ^\circ\mathrm{C}. $$How many liters of $$\mathrm{CO_2$}$$ gas are produced? (Molar mass $$\mathrm{$$NaHCO_3$$} = 84.01 g/$$mol, $$R = 0.0821 L$$·atm/mol·K)

Accepted Answer

$$2.9 L$$

Question 2

Which of the following best explains why the atomic radius decreases across a period from left to right in the periodic table?

Accepted Answer

The effective nuclear charge increases while shielding remains relatively constant.

Question 3

A gas expands from $$2.0 L to$$ $$6.0 L $$against an external pressure of $$1.2$$ atm at constant temperature. What is the work done by the gas (in Joules)? ($$1 L$$·atm $$= 101.3 J)$$

Accepted Answer

$$-490 J$$

Question 4

Which of the following statements about the kinetic molecular theory is FALSE?

Accepted Answer

Gas particles lose energy during elastic collisions.

Question 5

A photon of green light has a frequency of $$6.0 	imes 10$$^{14}$$\ \mathrm{s}^{-1}. $$What is its wavelength?

Accepted Answer

$$500 nm$$

Question 6

Which of the following pairs of species is correctly ordered from largest to smallest atomic/ionic radius?

Accepted Answer

$$\mathrm{S$$^{2-}$$} \u003e \mathrm{Cl^-} \u003e \mathrm{K^+} \u003e \mathrm{Ca$$^{2+}$$}$$

Question 7

Which color of visible light corresponds to photons with the highest energy per photon?

Accepted Answer

Violet

Question 8

An electron falls from $$n=6 to$$ $$n=3 in a $$hydrogen atom. What is the wavelength of the emitted photon? ($$R_H = 1.10 	imes 10^7$\ \mathrm{m}^{-1})$$

Accepted Answer

$$1094 nm$$

Question 9

Which of the following quantum number sets is NOT allowed for an electron in an atom?

Accepted Answer

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

Question 10

Which of the following best explains why the 2s orbital is lower in energy than the 2p orbital in multi-electron atoms?

Accepted Answer

The 2s orbital penetrates closer to the nucleus, experiencing less shielding.

Question 11

A 5.4 g sample of peanuts is burned under a beaker containing 466 g of water. The water warms from $$8.5\ ^\circ\mathrm{C} to$$ $$74.6\ ^\circ\mathrm{C}. $$What is the caloric value per gram of peanuts? ($$C_{water} = 4.18 J/g$$·$$^\circC$$, $$1$$ food calorie $$= 1000$$ cal, $$1$$ cal $$= 4.18 J)$$

Accepted Answer

$$5.70$$ calories/g

Question 12

Which experiment provided evidence for the existence of electron spin quantum numbers ($$m_s$$)?

Accepted Answer

The Stern-Gerlach experiment

Question 13

Which of the following is the correct electron configuration for bromine ($$\mathrm{Br}$$)?

Accepted Answer

$$[\mathrm{Ar}]\ 4s^2$\ 3d$$^{10}$$\ 4p^5$

Question 14

Which of the following best describes the shape of the $$d_{z^2$}$$ orbital?

Accepted Answer

A dumbbell with an equatorial ring

Question 15

Which of the following pairs is correctly ordered from lowest to highest first ionization energy?

Accepted Answer

$$\mathrm{Li} \u003c \mathrm{B} \u003c \mathrm{Be} \u003c \mathrm{C} \u003c \mathrm{O} \u003c \mathrm{N} \u003c \mathrm{F} \u003c \mathrm{Ne}$$

Question 16

Which of the following best describes the conditions under which the ideal gas law fails and the van der Waals equation must be used?

Accepted Answer

At high pressure and low temperature

Question 17

If $$\mathrm{NH_3$}$$ and $$\mathrm{HCl}$$ are released into still air, how far will $$\mathrm{NH_3$}$$ have effused when $$\mathrm{HCl}$$ has diffused 1.00 meter? (Use Graham's Law: $$	ext{rate}_{\mathrm{NH_3$}}/	ext{rate}_{\mathrm{HCl}} = \sqrt{M_{\mathrm{HCl}}/M_{\mathrm{NH_3$}}}$$, $$M_{\mathrm{HCl}} = 36.461 g/$$mol, $$M_{\mathrm{NH_3$}} = 17.031 g/$$mol)

Accepted Answer

$$1.46$$ meters

Question 18

Which two factors determine the effective nuclear charge ($$Z_{\mathrm{eff}}) $$experienced by an electron?

Accepted Answer

Actual nuclear charge and electron screening

Question 19

A reaction has $$\Delta H = -566 kJ/$$mol and $$\Delta n = -1$$ for the change in moles of gas. What is $$\Delta E at$$ $$1$$ atm and $$25\ ^\circ\mathrm{C}$$? ($$R = 8.314 J/$$mol·K)

Accepted Answer

$$-563.5 kJ/$$mol

General Chemistry Exam 3 Review – Step-by-Step Study Guidance

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