Chem 123

Which of the following solutions has the highest percent ionization? A. 0.025 M HC2H3O2 B. 0.05 M HC2H3O2 C. 0.1 M HC2H3O2 D. 0.25 M HC2H3O2 E. 0.5 M HC2H3O2

0.0250 M HC2H3O2

In Which of the following solutions would solid PbBr2 be expected to be the most soluble at 25 C 0.10 M HBr 0.10 M NaBr 0.10 M CaBr2 0.10 M KNO3 0.10 M PbNO3

0.10 M KNO3 Because it doesnt include any elements from PbBr2

Which of the following solution would have the highest pH? A. 0.100 M NaOH B. 0.200 M Ca(OH)2 C. 0.300 M LiOH D. 0.400 M Sr(OH)2 E. 0.500 M KOH

0.400 M Sr(OH)2

People often take milk of magnesia to reduce the discomfort associated with stomach acid or heartburn. The recommended does is 1 teaspoon, which contains 4.00 x 10^2 mg of Mg(OH)2. What volume of an HCl solution with a pH of 1.3 can be neutralized by one dose of milk of magnesia?

274 mL

Which of the following solutions is a buffer system? A. A solution that is 0.10 M NaCl and 0.10 M HCl B. A solution that is 0.10 M HCNl and 0.10 M LiCN C. A solution that is 0.10 M NaOH and 0.10 M HNO3 D. A solution that is 0.10 M HNO3 l and 0.10 M NaNO3 E. A solution that is 0.10 M HCN and 0.10 M KI

A solution that is 0.10M HCN and 0.10 M LiCN

Which of the equations shown below describes how a generic buffer neutralizes added strong acid?

A- + H+ --> HA

Which of the following captions has the highest potential to be reduced? Ag+ Cu2+ Sn2+ Al3+ Na+

Ag+

What is the oxidizing agent in the reaction shown below? Cd(s) + Ag+(aq) ---> Ag(s) + Cd2+(aq)

Ag+(aq)

Which of the following is/are true? A. A basic solution ha pH < 7 B. A neutral solution does not contain any H3O+ or OH- C. An acidic solution has [H3O+] > [OH-] D. All of the above are true E. None of the above are true

An acidic solutin has [H3O+] or[ OH-]

Which of the following processes has a S rxn > 0 CH3OH(l) ---> CH3OH(s) N2(g) + 3H2(g) ---> 2NH3(g) CH4(g) + H2O(g) ---> CO(g) + 3H2(g) Na2CO3(s) + H2O(g) + CO2(g) ---> 2NaHCO3(s) All of the above processes have a S rxn > 0

CH4(g) + H2O(g) ---> CO(g) + 3H2(g)

All spontaneous reactions occur quickly

False

What are the criteria for a spontaneous reaction? G < 0, E cell > 0, K > 1 G > 0, E cell > 0, K > 1 G > 0, E cell < 0, K > 1 G < 0, E cell > 0, K < 1 G > 0, E cell < 0, K < 1

G < 0, E cell > 0, K > 1

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of H+ and Fe3+(aq) in the balanced reaction? Fe2+(aq) + MnO4-(aq) ---> Fe3+(aq) + Mn2+(aq)

H+ = 8, Fe3+ = 5

Which of the following acids will have the strongest conjugate base? A. HCl B. HClO4 C. HNO3 D. HCN E. HI

HCN

Which of the following solutions would have the lowest pH? Assume that they are all 0.10M. Ka values are listed on the equation sheet. A. HF B. HCN C. HNO2 D. HCHO2 E. HClO2

HClO2

Place the following in order of increasing acid strength. HOI HOBr HOCl

HOI < HOBr < HOCl

Which of the following species is/are amphoteric? A. HF B. HCN C. HNO2 D. HCHO2 E. HClO2

HPO4

Which of the following are characteristics of a strong acid?

Ionizes completely in aqueaous of a strong acid, has equillibrium far to the right, has a polar bond

What element is undergoing oxidation (if any) in the following reaction? Ni(s) + 2 AgClO4(aq) ---> Ni(ClO4)2(aq) + 2 Ag(s)

Ni

A solution containing CaCl2 is mixed with a solution of Li2C2O4 to form a solution that is 2.1 x 10^-5 M in calcium ion and 4.75 x 10^-5 M in oxalate ion. What will happen once these solutions are mixed? Ksp (CaC2O4)= 2.3 x 10^-9

No precipate will form since Ksp > Q for calcium oxalate

Under which set of conditions is G rxn for the reaction A(g) ---> B(g) most likely to be negative?

PA + 10.0 atm; PB + 0.010 atm

What is true about the change in the entropy of the universe for the reaction shown below? N2(g) + 2O2(g) ---> 2NO2(g) H = +66.4 kJ

The entropy of the universe decreases at any temperature

Consider a reaction that has a positive change in H and a positive change in S. Which of the following statements are true?

This reaction will be spontaneous only at high temperatures

If the pKa of HCHO2 is 3.74 and the pH of an HCHO2/NaCHO2 solution is 3.11, which of the following is true? A. [HCHO2] < [NaCHO2] B. [HCHO2] = [NaCHO2] C. [HCHO2] > [NaCHO2] D. It is not possible to make a buffer of this pH from HCHO2 and NaCHO2

[HCHO2] > [NaCHO2]

When titrating a weak base with a monophonic strong acid, the...

pH will be less than 7 at the equivalence point