Q: A photon has an energy of $$5.0 \times 10$$^{-19}$$ J. What is the frequency of this photon? (h = 6.63$$ \times $$10^{-34}$$ \ \mathrm{J \cdot s}$$)

A. $$7.5 \times 10$$^{14}$$ \ \mathrm{Hz}$$

Question 1

Which of the following statements best describes a chemical change?

Accepted Answer

C. Burning propane in air to produce energy, carbon dioxide, and water

Question 2

A student measures a volume of water as 1.58 mL using a graduated cylinder marked to 0.1 mL. How should these measurements be properly reported?

Accepted Answer

C. 1.58 mL

Question 3

What is the result of the calculation $$ (1.25 	imes 10$$^{-4}$$) 	imes (2.0 	imes 10$$^{-3}$$) $$ reported with the correct number of significant figures?

Accepted Answer

C. $$2.5 	imes 10$$^{-7}$$

Question 4

A dry beaker has a mass of 38.46 g. When 100.0 mL of an unknown liquid is added, the total mass is 105.86 g. What is the density of the liquid?

Accepted Answer

B. $$1.054 \ \mathrm{g/mL}$$

Question 5

Which statement is consistent with Thomson’s cathode ray experiments (and Millikan’s oil-drop findings)?

Accepted Answer

C. The electron’s mass is about $$1/2000$$ the mass of a H atom.

Question 6

Boron occurs as two isotopes, $$^{10}\mathrm{B} (10.01 u) $$and $$^{11}\mathrm{B} (11.01 u). If $$boron’s atomic weight is 10.81 u, which of the following is the most likely abundance of these isotopes?

Accepted Answer

B. 20% $$^{10}\mathrm{B}$$, 80% $$^{11}\mathrm{B}$$

Question 7

Which of the following compounds is insoluble in water?

Accepted Answer

C. $$\mathrm{PbS}$$

Question 8

Mixing which pair of aqueous solutions will result in formation of a precipitate?

Accepted Answer

A. Sodium sulfate + Lead(II) nitrate

Question 9

A reaction has a theoretical yield of 15.0 g, but a chemist actually obtains 12.0 g. What is the percent yield of the product?

Accepted Answer

A. 80.0%

Question 10

Which of the following gases is not commonly produced by a double-displacement reaction in aqueous solution?

Accepted Answer

D. $$\mathrm{O}_2$$

Question 11

Which pair of variables is inversely proportional for an ideal gas (assuming all other conditions are constant)?

Accepted Answer

B. Volume and pressure

Question 12

Which condition causes ideal gas behavior to deviate most from real gas behavior?

Accepted Answer

A. Low temperature and high pressure

Question 13

Which of the following statements about ideal gases is correct according to the kinetic-molecular theory?

Accepted Answer

C. Gas molecules move in straight lines until they collide with something.

Question 14

Methane ($$\mathrm{CH}_4) $$has a molar enthalpy of combustion $$\Delta H_{comb} = -890.4 kJ/$$mol. How much heat is released when 0.80 g of $$\mathrm{CH}_4 is $$completely combusted?

Accepted Answer

A. 44.5 kJ

Question 15

When solid $$\mathrm{NH_4NO_3}$$ dissolves in water, the solution cools down. Which of the following is true for the dissolving process?

Accepted Answer

B. It is endothermic and $$\mathrm{NH_4NO_3}$$ solution gains heat from the surroundings.

Question 16

A photon has an energy of $$5.0 	imes 10$$^{-19}$$ J. What is the frequency of this photon? (h = 6.63$$ 	imes $$10^{-34}$$ \ \mathrm{J \cdot s}$$)

Accepted Answer

A. $$7.5 	imes 10$$^{14}$$ \ \mathrm{Hz}$$

Question 17

Which subshell is described as having a 'dumbbell' shape and can hold a maximum of 6 electrons?

Accepted Answer

B. p subshell

Question 18

Which element has the smallest atomic radius?

Accepted Answer

C. Ne

Question 19

Which pair of atoms are isoelectronic (same number of electrons)?

Accepted Answer

B. $$\mathrm{F^-}$$ and $$\mathrm{Ne}$$

General Chemistry: Comprehensive Study Guide (Units 1–11)

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