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CHM 104 final practice
Terms in this set (40)
For the reaction shown below, which of the following is a conjugate acid-base pair?
C5H5N(aq) + H2O(l)
C5H5NH+(aq) + OH−(aq)
C5H5N, C5H5NH+ and H2O, OH−
A patient's urine sample gave a reading of pH = 8.2. What is the value of [H3O+] in this solution?
6.0 × 10-9 M
Consider two beakers, one containing 1.0 M HCl and the other containing 1.0 M CH3COOH. Which solution would have the lowest pH?
1.0 M HCl because its solution contains a higher hydronium ion concentration than 1.0 M CH3COOH
Titration of 15.0 mL of an NaOH solution required 7.4 mL of a 0.25 M KNO3 solution. What is the molarity of the NaOH solution?
What is TRUE about a solution whose pH is less than 7?
It has a hydronium ion concentration that is higher than pure water itself.
Which of the following is an example of a diprotic acid?
Which statement correctly describes what is happening in the reaction shown below? 2Mg(s) + S2(g) → MgS(s)
Mg is oxidized.
What is the conjugate acid of NH2−?
Which of the following compounds is NOT considered a polyprotic acid?
Sodium hydroxide (NaOH) can react with phosphoric acid (H3PO4) in a neutralization reaction. What is the reacting ratio of NaOH to H3PO4?
What is the hydronium ion concentration of pure water at 25°C?
1.0 × 10−7 M
What is the general term for the process in which a chemical species loses electrons?
A particular buffer solution consists of a weak acid and its conjugate base. How could this buffer solution be modified so as to increase its buffer capacity against added base?
Increase the concentration of the weak acid.
What is the hydronium ion concentration of a solution with a pH of 6.0?
1 × 10−6 M
The species that remains after an acid donates a proton is called its conjugate base. What is the conjugate base of the hydronium ion, H3O+?
A solution containing a buffer has an initial pH of 8.78. If a student adds 5 drops of HCl(aq) to this solution, what would be a reasonable pH for the resulting solution?
Calculate the molar concentration of a sodium hydroxide solution if 60.00 mL of this solution were required to neutralize 30.00 mL of a 0.150 M hydrochloric acid solution. NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)
What is the [OH−] of a solution that has a pH = 10.95?
8.9 × 10-4 M
Morphine is used medicinally as a pain reliever. If an aqueous solution of morphine has [H3O+] = 1.1 × 10−10 M, what is the pH of this solution?
Which of the following best represents the autoionization, or self-ionization, of water?
2H2O(l)--><-- H3O+(aq) + OH-(aq)
What percentage of the initial amount of a radioactive isotope will remain after ten half-lives?
What term is used to describe radioactive substances that are used as probes to study internal organs?
What fissionable isotope or element is produced from uranium-238 in a breeder reactor?
What type of radioactive decay is illustrated by the following nuclear equation?
238 C --> 234 B + 4 He
92 90 2
Which of the following measures of radioactivity takes into account the relative biological effect (RBE) of the radiation involved?
Americium-241 is a radioactive isotope used in smoke detectors. If the symbol for this isotope is
241 Am, which of the following
correctly describes its subatomic composition?
95 protons, 95 electrons, 146 neutrons
Which type of radiation emitted by radioactive nuclei is similar in mass to a helium atom?
The isotope 63 Ni
decays to 63 Cu
by emitting radiation. What type of radiation is emitted?
What particle or nucleus X is needed to complete the following equation
210 Rn --> 206 Po + X
The term LD50 represents which of the following?
the dosage of toxic material needed to kill 50% of the exposed population in 30 days
What is the charge of a beta particle?
When a nuclear reaction is balanced, which of the following is TRUE?
Both the sum of the mass numbers and the sum of the atomic numbers are the same on either side of the reaction.
Which one of the following radioactive isotopes is used to diagnose coronary disease?
The half-life of cobalt-60 is 5.3 years. What percent of a sample of cobalt-60 will remain after 21.2 years?
VControl rods made of cadmium or boron moderate the fission reactions in nuclear power plants. Which of the following best describes how control rods function?
Control rods absorb some of the fast moving neutrons that are produced in the fission reactions, preventing their initiation of other fission reactions.
Which radioactive emission can be stopped by a few sheets of paper?
Which type of radiation is negatively charged?
What statement concerning the half-life of a radioactive isotope is FALSE?
The half-life of a particular radioactive isotope decreases as the amount of the radioactive material decreases.
What nuclear process involves heavy nuclei splitting into lighter nuclei?
Which of the following isotopes has no neutrons?
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