Practice Quiz

Praxis II: Chemistry Exam Prep - Question List

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86.
Given that the half-life of strontium-90 is 28.8 years, what mass of a 50.0 g sample of strontium-90 will remain after 144 years?
  1. 25.0 g
  2. 6.25 g
  3. 1.56 g
  4. 0.391 g
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87.
As atomic number increases in a group of the periodic table, which of the following atomic properties decreases?
  1. Electronegativity
  2. Metallic character
  3. Atomic mass
  4. Atomic radius
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88.
Which of the following elements has an atomic radius closest to but smaller than that of sulfur?
  1. Selenium
  2. Phosphorus
  3. Oxygen
  4. Chlorine
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89.
Which of the following symbols represents the element silver?
  1. Si
  2. Hg
  3. Sn
  4. Ag
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90.
Which of the following is one cause of eutrophication in aquatic ecosystems?
  1. An increase in the amount of acid precipitation.
  2. An increase in the concentration of heavy metals
  3. An overabundance of nitrogen-containing compounds.
  4. An overabundance of dissolved oxygen
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