Question 1

Which of the following species can act as both a Bronsted-Lowry acid and a base in aqueous solution?

Accepted Answer

$$HCO_3$$^-$

Question 2

A 0.03 M solution of HCl is prepared at 25$$^\circC. $$What is the pH of this solution?

Accepted Answer

$$1.5$$

Question 3

Which of the following salts will hydrolyze in water to produce a basic solution?

Accepted Answer

NaC_2H_3O_2$

Question 4

Which of the following mixtures would constitute a buffer solution?

Accepted Answer

$$NH_3$$ and NH_4NO_3

Question 5

A 1.0 	imes $$10^{-3}$$ \ M$$ solution of Ba(OH)_2 is $$prepared at 25$$^\circC. $$What is the pH of the solution?

Accepted Answer

$$11.3$$

Question 6

Which of the following is the strongest acid?

Accepted Answer

$$HClO_4$$

Question 7

Which of the following best explains why water (H$$_2O) $$has a much higher boiling point than H$$_2S$$, H$$_2Se$$, and H$$_2Te$$?

Accepted Answer

Extensive hydrogen bonding

Question 8

A 0.10 \ m$$ aqueous solution of HF shows a freezing point of -0.198$$^\circ$$C. What is the percent dissociation of HF? (K_f$ for water = 1.86$$^\circ$C/m)

Accepted Answer

$$6.4\%$$

Question 9

Which of the following is the correct expression for the solubility product constant ($$K_{sp}) $$for Ag$$_2$$CrO$$_4$$?

Accepted Answer

$$K_{sp} = [Ag^+]^2 [$$CrO_4$$^{2-}]$$

Question 10

A sample of neon occupies a volume of $$27.3 L at $$STP. What would be the volume of this neon at $$177^\circC $$and $$0.100$$ atm pressure?

Accepted Answer

$$450 L$$

Question 11

Which of the following reactions will an increase in total pressure at constant temperature favor the formation of products?

Accepted Answer

$$2NO(g) + O_2$(g) \rightarrow 2NO_2(g)$$

Question 12

Which of the following best describes the effect of adding solid Na$$_2SO$_4 to an $$aqueous solution in equilibrium with solid BaSO$$_4$$?

Accepted Answer

Precipitation of more BaSO$$_4$$

Question 13

Which of the following is the correct IUPAC name for N$$_2O$_3$$?

Accepted Answer

Dinitrogen trioxide

Question 14

A 0.10 M solution of a monoprotic acid, HA, has a $$K_a = 1.0 	imes 10$$^{-6}$$. What is the pH of the solution?

Accepted Answer

$$3.5$$

Question 15

Which of the following best explains why magnesium metal floats to the surface when placed in dilute sulfuric acid?

Accepted Answer

Gas bubbles attached to the metal buoy the metal to the top

Question 16

Which of the following best describes the geometry of the SeF$$_3^+$$ ion?

Accepted Answer

Trigonal pyramidal

Question 17

Which of the following is most likely to replace selenium (Se) in a biological system, based on periodic trends?

Accepted Answer

Te

Question 18

Which of the following best describes the effect of temperature on the numerical value of the equilibrium constant for a chemical reaction?

Accepted Answer

It is affected by temperature

Question 19

Which of the following is the most soluble in water?

Accepted Answer

C_2H_5OH$

Question 20

Which of the following best describes the bond type and molecular polarity of SiCl$$_4$$?

Accepted Answer

Polar bonds, nonpolar molecule

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