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Lesson Worksheet: Lewis Acids and Bases Chemistry

In this worksheet, we will practice explaining what Lewis acids and bases are, along with their characteristic properties, and identifying them in chemical reactions.

Q1:

Which of the following statements best defines a Lewis acid?

  • AA substance that can donate a H+ ion
  • BA substance that can donate a pair of electrons
  • CA substance that can accept a pair of electrons
  • DA substance that produces OH ions
  • EA substance that can accept a H+ ion

Q2:

Fill in the blank: A species that can donate an electron pair is known as .

  • Aa Lewis base
  • Ba Brønsted–Lowry base
  • Ca Brønsted–Lowry acid
  • Da Lewis acid
  • Ean Arrhenius base

Q3:

The equation below shows the reaction of borane with ammonia to form an ammonia–borane compound. BH+NHBHNH3333

Which species acts as a Lewis acid?

  • ABHNH33
  • BNH3
  • CBH3

Which species acts as a Lewis base?

  • ABH3
  • BNH3
  • CBHNH33

Q4:

Water can react with ammonia and hydrogen chloride according to the following chemical equations.

HO+NHNH+OHHO+HClHO+Cl234+23+

According to these equations, how can water be defined in terms of Lewis’s theory?

  • AA Lewis base
  • BA Lewis acid
  • CBoth, a Lewis acid and a Lewis base

Q5:

Which of the following reactions is an example of a Lewis acid–base reaction but not a Brønsted–Lowry acid–base reaction?

  • ANH+CHCOOHNH+CHCOO334+3
  • BNH+BHNHBH3333
  • CNH+HClNHCl34
  • DNH+HONH+OH324+
  • ENH+HNONHNO3343

Q6:

According to the Brønsted–Lowry theory, when ammonia gas is dissolved in water it will , forming .

  • Agive up a proton, NH3+
  • Baccept a proton, NH3+
  • Caccept a proton, NH4+
  • Dgive up a proton, NH4+

Q7:

Which of the following best describes the difference between a Brønsted–Lowry base and a Lewis base?

  • AA Lewis base is a proton donor, while a Brønsted–Lowry base is a species that can accept an electron pair or more.
  • BA Lewis base is a proton acceptor, while a Brønsted–Lowry base is a species that can donate an electron pair or more.
  • CA Brønsted–Lowry base is a proton donor, while a Lewis base is a species that can accept an electron pair or more.
  • DA Brønsted–Lowry base is a proton acceptor, while a Lewis base is a species that can donate an electron pair or more.
  • EA Brønsted–Lowry base is an OH ion acceptor, while a Lewis base is a species that can donate an electron pair or more.

Q8:

Consider the reaction shown:

NH()+HO()NH()+OH()324+glaqaq

Which of the following is correct about the reaction?

  • AAmmonia is the Lewis base which donates a lone pair of electrons, while water is the Lewis acid which accepts a lone pair of electrons.
  • BAmmonia is the Lewis acid which donates a lone pair of electrons, while water is the Lewis base which accepts a lone pair of electrons.
  • CAmmonia can act as a Lewis base as well as a Lewis acid which can donate or accept a lone pair of electrons.
  • DAmmonia is the Lewis base which accepts a lone pair of electrons, while water is the Lewis acid which donates a lone pair of electrons.

Q9:

Fill in the blank: On dissolution of hydrogen chloride in water, water will act as a as it .

  • ALewis base, accepts a proton to form a hydronium ion
  • BBrønsted–Lowry base, accepts a proton to form a hydronium ion
  • CBrønsted–Lowry acid, accepts a proton to form a hydronium ion
  • DBrønsted–Lowry base, donates a proton to form a hydroxide ion
  • ELewis acid, accepts a proton to form a hydronium ion

Q10:

Which of the following species is not a Lewis acid?

  • AH+
  • BMg2+
  • CNH3
  • DAlCl3
  • EBF3

This lesson includes 19 additional questions and 14 additional question variations for subscribers.

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