Worksheet: Reactions of Alkali Metals

In this worksheet, we will practice writing equations for the reactions of alkali metals with oxygen and water and explain trends in reactivity.

Q1:

Freshly cut lithium tarnishes in air in under a minute. With which substance is lithium reacting when it tarnishes?

  • AWater
  • BCarbon dioxide
  • CNitrogen
  • DOxygen
  • EArgon

Q2:

Why are the alkali metals lithium, sodium, and potassium stored under oil?

  • AThey oxidize if exposed to air.
  • BThey react with nitrogen in the air.
  • CThey react with the oil to form a protective coat.
  • DThey are sensitive to ultraviolet light, which the oil blocks.
  • EThey are unstable if not in contact with oil.

Q3:

What is the molecular formula of the compound produced when lithium reacts with oxygen gas?

  • A L i O 2 3
  • B L i O 2
  • C L i O
  • D L i O 3
  • E L i O 2

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