Chemistry Fundamentals Quiz

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Questions and Answers

How many moles of carbon dioxide are produced by the complete combustion of 7.0 g of ethene, $C_2H_4$ (g)?

  • 0.25
  • 0.5 (correct)
  • 0.75
  • 1.0

Which is a possible empirical formula for a substance with Mr = 42?

  • C3H8
  • CH2
  • C3H6
  • CH (correct)

Which quantities are different between two species represented by the notation $({52}^{128})Te$ and $({53}^{128})I^-$?

  • The number of protons and electrons only
  • The number of protons only
  • The number of protons, neutrons, and electrons
  • The number of protons and neutrons only (correct)

What is the relative atomic mass of a sample of chlorine containing 70 % of the $^{35}Cl$ isotope and 30 % of the $^{37}Cl$ isotope?

<p>35.5 (D)</p> Signup and view all the answers

Which molecule is polar?

<p>PH3 (D)</p> Signup and view all the answers

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