Exam 2, Intro to Chemistry-BIO 1111

Which species is the conjugate base of NH3? A.NH4+ B.NH2 C.NH2- D.H2O E.NH4OH

C

The pH of a lime is 1.90. What is the [H3O+]? A.1.3 × 10-2 M H3O+ B.1.3 × 1012 M H3O+ C.7.9 × 101 M H3O+ D.7.9 × 10-13 M H3O+ E.1.9 M H3O+

A

What are the products of the acid-base reaction of sodium carbonate with acetic acid? A.CO2(g) + H2O(l) + 2 NaCH3COO(aq) B.5 CO2(g) + 2 H2O(l) + 2 NaOH(aq) C.H2CO3(aq) + H2O(l) + 2 NaOH(aq) D.CO(g) + H2O(l) + 2 NaCH3COO(aq)

A

What does it mean if a substance is described as being radioactive? A.The substance emits high energy particles or rays from its unstable nucleus. B.The substance was exposed to radiation that was given off by a decaying nucleus. C.The substance readily absorbs energy from the radiofrequency region of the electromagnetic spectrum. D.The substance is extremely small and special radiomicroscopes are necessary to view it.

A

What is the molarity of an HCl solution if 43.6 mL of a 0.125 M KOH solution are needed to titrate a 25.0 mL sample of the acid according to the equation below? KOH(aq) + HCl(aq) → H2O(l) + KCl(aq) A.0.218 M HCl B.0.573 M HCl C.0.0717 M HCl D.4.58 M HCl E.1.74 M HCl

A

When phosphoric acid (H3PO4) dissolves in water, the equilibrium shown below is established. If Ka = 7.5 × 10-3 for H3PO4, which statement concerning an aqueous solution of phosphoric acid is correct? H3PO4 + H2O H3O+ + H2PO4- A.An aqueous solution of phosphoric acid contains mainly H3PO4 molecules. B.An aqueous solution of phosphoric acid contains predominantly H3O+ and H2PO4- ions. C.An aqueous solution of phosphoric acid contains equal amounts of H3O+ and H3PO4. D.An aqueous solution of phosphoric acid contains a greater concentration of dissolved ions than it does neutral phosphoric acid molecules.

A

Which acid is the strongest? A.Hydrogen sulfate ion HSO4- (Ka = 1.2 × 10-2) B.Hydrocyanic acid HCN (Ka = 4.9 × 10-10) C.Hydrofluoric acid HF (Ka = 7.2 × 10-4) D.Ammonium ion NH4+ (Ka = 5.6 × 10-10)

A

Which nuclear equation is an example of β decay? see sheet

A

Which solution has the lowest pH? A.1.3 × 10-8 M -OH B.1.0 × 10-7 M -OH C.5.1 × 10-2 M -OH D.3.9 × 10-8 M -OH E.2.3 × 10-3 M -OH

A

Which species can act as a Brønsted-Lowry base? A.CO32- B.HBr C.H2CO3 D.NH4+

A

Which type of radiation has the largest mass? A.An alpha particle B.A gamma ray C.A positron D.A beta particle

A

Which unit describes the amount of radiation absorbed by one gram of a substance? A.rad B.rem C.Bq D.gray

A

Which unit of radioactivity is equivalent to 3.7 × 1010 disintegrations/second? A.1 Ci B.1 mCi C.1 μCi D.1 Bq

A

Which species completes this nuclear equation shown below? 30,15 P→ _____ + 0,+1e A.30,16 P B.30, 14 Si C.30,14 P D.30,16 S

B

Which species is the conjugate acid of HCO3-? A.CO32- B.H2CO3 C.CO2 D.H2O

B

Which term correctly describes the medical condition in which the pH of blood is greater than 7.45, and therefore the blood is more basic than normal? A.respiratory alkalosis B.alkalosis C.respiratory acidosis D.acidosis

B

Which type of radiation has the greatest penetrating power? A.An alpha particle B.A gamma ray C.A beta particle D.All of the above have the same penetrating power.

B

What is the pH of a peach with a [-OH] = 3.2 × 10-11 M -OH? A.11.32 B.10.49 C.3.51 D.3.2

C

Which amount of radioactivity is equivalent to 3.7 × 105 mCi? A.3.7 × 103 Ci B.3.7 × 102 μCi C.3.7 × 108 μCi D.3.7 × 1014 μCi

C

Which amount of radioactivity is equivalent to 4.1 × 1012 disintegrations/s? A.1.1 × 103 Ci B.4.1 × 109 Bq C.4.1 × 1012 Bq D.1.1 × 1010 μCi

C

Which buffer solution has the lowest pH (HF has Ka = 7.2 × 10-4)? A.0.10 M HF and 0.10 M NaF B.0.20 M HF and 0.20 M NaF C.0.20 M HF and 0.10 M NaF D.0.10 M HF and 0.20 M NaF E.All of the buffer solutions described above have the same pH.

C

Which compound is a weak acid? A.HNO3 B.HBr C.CH3COOH D.H2SO4

C

Which is the symbol for a beta particle? A.1,0 e B.1,-1 e C.0,-1 e D.-1,1 e

C

Which nuclear equation is an example of positron emission? see sheet

C

Which quantity represents the smallest amount of radioactivity? A.1 × 10-3 Ci B.1 × 104 mCi C.1 Bq D.1 × 1010 μCi

C

Which solution containing an equal number of moles of each of the substances is a buffer? A.HCl and NaCl B.HNO2 and HNO3 C.CH3COOH and NaCH3COO D.H2CO3 and CO32- E.More than one of the solutions above is a buffer.

C

Which type of radiation has a negligible mass and a charge of +1? A.alpha particle B.gamma ray C.positron D.beta particle

C

Which salt forms a basic solution when dissolved in water? A.KCl B.NH4Br C.LiNO3 D.Na3PO4

D

Which salt forms a solution with a pH < 7 when dissolved in water? A.RbI B.NaCH3COO C.LiNO2 D.(NH4)2SO4

D

Which solution has the highest pH? A.4.3 × 10-8 M H3O+ B.1.0 × 10-7 M H3O+ C.5.1 × 10-2 M H3O+ D.1.9 × 10-8 M H3O+ E.1.0 × 10-2 M H3O+

D

Which species completes the nuclear equation shown below? 14,7 N+ 1,0n→ _____ + 1,1 H A.14,6 alpha B.14,8 O C. 14,6N D.14,6 C

D

Which species completes the nuclear equation shown below? 0,+1e + 0,-1e → _____ A. beta B.α C.γ D.2 γ

D

Which species is a diprotic acid? A.Mg(OH)2 B.CH3COOH C.H2 D.H2CO3

D

How many neutrons are generated in the nuclear equation shown below? see sheet

E

What is the molarity of an HNO3 solution if 24.1 mL of a 0.250 M Ba(OH)2 solution are needed to titrate a 15.0 mL sample of the acid according to the equation below? Ba(OH)2(aq) + 2 HNO3(aq) 2 H2O(l) + Ba(NO3)2(aq) A.0.402 M HNO3 B.0.156 M HNO3 C.0.311 M HNO3 D.0.201 M HNO3 E.0.803 M HNO3

E

What types of cells are most sensitive to radiation damage? A.the intestinal tract cells B.reproductive organs cells C.cancer cells D.bone marrow cells E.All of the cell types listed above are very sensitive to radiation damage.

E

Which nuclear equation is an example of nuclear fission?

235,92 U + 1,0 n--> 137,52 Te + 97,40Zr, 2:1,0n

What is the balanced nuclear equation for the β emission of the radioisotope strontium-90?

90,38 Sr--> 90,39Y + 0,-1 e

A sample of urine has a pH of 8.2. Which statement describing the urine sample is NOT true? A.The urine sample is basic. B.The urine sample has a hydronium ion concentration greater than that of a neutral solution. C.The urine sample has a hydroxide ion concentration greater than its hydronium ion concentration. D.The urine sample has a hydroxide ion concentration greater than 1.0 × 10-7.

B

A sample of water from the Chesapeake Bay has [H3O+]=3.1 × 10-9 M. Which statement below accurately describes this water sample? A.The pH of the water sample is 7.5. B.The water sample is a basic solution. C.The water sample doesn't contain any hydroxide ions. D.The water sample has a higher concentration of hydronium ions than pure water does.

B

An alpha particle is a high-energy particle that contains A.one proton and one neutron. B.two protons and two neutrons. C.one electron. D.one proton.

B

In the acid-base reaction: F-(aq) + HNO3(aq) HF(aq) + NO3-(aq) A.F- is the acid and its conjugate base is HF, and HNO3 is the base and its conjugate acid is NO3-(aq). B.HNO3 is the acid and its conjugate base is NO3-(aq), and F- is the base and its conjugate acid is HF. C.F- is the acid and its conjugate base is NO3-(aq), and HNO3 is the base and its conjugate acid is HF. D.HNO3 is the acid and its conjugate base is HF, and F- is the base and its conjugate acid is NO3-(aq).

B

In the acid-base reaction: HCN(aq) + F-(aq) CN-(aq) + HF(aq), where Ka (HCN) = 4.9 × 10-10 and Ka (HF) = 7.2 × 10-4, the A.products are favored. B.reactants are favored.

B

Phosphorous-32 is used for organ imaging. How many neutrons are present in this radioisotope? A.15 B.17 C.32 D.47

B

The defintion of a Brønsted-Lowry acid is A.a compound that contains hydroxide and dissolves in water to form OH-. B.a compound that is a proton donor. C.a compound that is a proton acceptor. D.a compound that contains a hydrogen atom and dissolves in water to form a hydrogen ion, H+.

B

The half-life (t1/2) of a radioactive isotope depends on which of the following? A.the amount of the radioisotope present B.the isotope C.the temperature D.the pressure E.all of the factors listed above

B

The pH of normal blood is 7.4. The pH of a diabetic's blood was determined to be 6.4. Which comparison of these two blood samples is accurate? A.The diabetic's blood has a lower [H3O+] than normal blood. B.The diabetic's blood is more acidic than normal blood. C.Normal blood has a lower [OH-] than the diabetic's blood. D.Normal blood has a higher [H3O+] than the diabetic's blood.

B

To treat a thyroid tumor, a patient must be given a 150-mCi dose of iodine-131, supplied in a solution containing 32 mCi/mL. What volume of solution must be administered per dose? A.1.0 mL B.4.7 mL C.4,800 mL D.32 mL

B

What are the number of protons, the number of neutrons, and the mass number of the radioisotope ? A.149, 102, and 251, respectively B.102, 149, and 251, respectively C.102, 251, and 353, respectively D.149, 251, and 353, respectively

B

What is the minimum recommended protective equipment when handling a beta particle emitter? A.lab coat and gloves B.heavy lab coat and gloves C.lead shielding D.No protective equipment is recommended.

B

Which acid has the strongest conjugate base? A.Hydrogen sulfate ion HSO4- (Ka = 1.2 × 10-2) B.Hydrocyanic acid HCN (Ka = 4.9 × 10-10) C.Hydrofluoric acid HF (Ka = 7.2 × 10-4) D.Ammonium ion NH4+ (Ka = 5.6 × 10-10)

B

Which acid is the weakest? A.Hydrogen sulfate ion HSO4- (Ka = 1.2 × 10-2) B.Hydrocyanic acid HCN (Ka = 4.9 × 10-10) C.Hydrofluoric acid HF (Ka = 7.2 × 10-4) D.Ammonium ion NH4+ (Ka = 5.6 × 10-10)

B

Which diagram properly depicts the dissolved species present in an aqueous solution of KOH? (water molecules are not shown) A- K+, H+, O-2 B- K+, OH- C-KOH, KOH, KOH D- K, O2, H2

B

Which ion is the strongest base? A.Br- B.F- C.I- D.NO3-

B

Which nuclear equation is an example of nuclear fusion? see sheet

B

Which quantity represents the greatest amount of radioactivity? A.1 × 10-3 Ci B.1 × 104 mCi C.1 Bq D.1 × 10-10 μCi

B

Which radioisotope is used to measure thyroid activity and treat thyroid disease? A.Technetium-99m B.Iodine-131 C.Cobalt-60 D.Carbon-11

B

Which solution has the highest pH? A.4.3 × 10-8 M -OH B.1.0 × 10-7 M -OH C.5.1 × 10-2 M H3O+ D.1.9 × 10-8 M -OH E.1.0 × 10-2 M H3O+

B

Which species can act as a Brønsted-Lowry acid? A.CO32- B.HBr C.Br2 D.LiOH

B

Which species completes the nuclear equation shown below? 218, 84 Po→ _____ + 4,2He A.214, 82 Po B.214, 82 Pb C.222, 86 Rn D.222, 86 Po

B

Which species completes the nuclear equation shown below? 232,90 Th → 228,88 Ra + _____ A.4,2 Beta B.4,2 He C.2:0,+1 e D.2:0,-1 e

B

How many milliliters of 0.653 M NaOH are needed to neutralize 25.0 mL of a 1.02 M HBr solution? The neutralization reaction is: NaOH(aq) + HBr(aq) → H2O(l) + NaBr(aq) A.16.0 mL NaOH B.25.5 mL NaOH C.39.1 mL NaOH D.16.3 mL NaOH

C

Normal gastric juice has a pH of about 2. Assuming that normal gastric juice is primarily aqueous HCl, what is the concentration of HCl in the stomach? A.2 M HCl B.1.0 × 102 M HCl C.0.01 M HCl D.0.14 M HCl

C

What is the balanced equation for the acid-base reaction of nitrous acid with lithium hydroxide? A.LiOH(aq) + HNO3(aq) H2O(l) + LiNO3(aq) B.Li(OH)2(aq) + 2 HNO3(aq) 2 H2O(l) + Li(NO3)2(aq) C.LiOH(aq) + HNO2(aq) H2O(l) + LiNO2(aq) D.2 LiOH(aq) + H2NO2(aq) 2 H2O(l) + Li2NO2(aq)

C

What is the conjugate base of the hydronium ion, H3O+? A.OH- B.H2O- C.H2O D.H3O+ has no conjugate base

C

What is the expression for Kw, the ion-product constant for water? A.Kw = [H2O]2 B.Kw = [H3o+][-OH]/[H20]2 C.Kw = [H3O+][-OH] D.Kw = [H30+]/[-OH]

C

What is the pH of a buffer that contains 0.15 M CH3COOH and 0.10 M NaCH3COO (Ka = 1.8 × 10-5)? A.4.74 B.7.00 C.4.57 D.4.92

C

What is the pH of a cleaning solution with a [H3O+] = 7.4 × 10-9 M H3O+? A.5.9 B.7.13 C.8.13 D.5.87

C

Ammonia, NH3, is an example of a A.strong acid B.strong base C.weak acid D.weak base

D

An aqueous solution with a low pH is necessary for a certain industrial process. Which of the following solutions would have the lowest pH? A.2.0 M NaOH B.0.5 M HCl C.1.0 M acetic acid, CH3COOH D.1.0 M HCl E.0.15 M NaOH

D

If the half-life of phosphorus-32 is 14.3 days, how much of a 200. mg sample of phosphorus-32 remains after 71.5 days? A.100. mg B.50. mg C.12.5 mg D.6.25 mg

D

The [-OH] in a sample of egg whites is 6.3 × 10-7 M. What is the [H3O+] in these egg whites? A.6.3 × 10-7 M H3O+ B.1.0 × 10-7 M H3O+ C.6.3 × 10-21 M H3O+ D.1.6 × 10-8 M H3O+ E.1.0 × 10-14 M H3O+

D

The [H3O+] in a cabernet sauvignon wine is 5.9 × 10-4 M. What is the [-OH] in this wine? A.5.9 × 10-4 M -OH B.1.0 × 10-7 M -OH C.5.9 × 10-18 M -OH D.1.7 × 10-11 M -OH E.1.0 × 10-14 M -OH

D

The definition of an Arrhenius acid is A.a compound that contains hydroxide and dissolves in water to form OH-. B.a compound that is a proton donor. C.a compound that is a proton acceptor. D.a compound that contains a hydrogen atom and dissolves in water to form a hydrogen ion, H+.

D

What is the SI unit in the measurement of radioactivity? A.Ci B.mCi C.μCi D.Bq

D

What is the estimated the age of an artifact that has 1/16 of the amount of carbon-14 (relative to carbon-12) compared to living organisms. (C-14 t1/2 = 5,730 years) A.358 years B.5,730 years C.17,190 years D.22,920 years E.28,650 years

D

What is the net ionic equation for the acid-base reaction of hydrobromic acid with sodium hydroxide? A.NaOH(aq) + HBr(aq) → H2O(l) + NaBr(aq) B.Na+(aq) + -OH(aq) + H+(aq) + Br-(aq) → H2O(l) + Na+(aq) + Br-(aq) C.Na+(aq) + -OH(aq) + H+(aq) + Br-(aq) → H+(aq) + -OH(aq) + Na+(aq) + Br-(aq) D.-OH(aq) + H+(aq) → H2O(l)

D

Which nuclear equation is an example of α decay? see sheet

D