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ARC-Challenge / Mercury_407539 / When frozen carbon dioxide (CO_2) is heated, it changes directly into a gas.…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

When frozen carbon dioxide (CO_{2}) is heated, it changes directly into a gas. Which statement best indicates that a physical change has taken place?

choices

  • Heat caused an increase in gas production.
  • Heat caused a new substance to form.
  • Heat caused a decrease in energy.
  • Heat caused a change in state.

Discussion

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Source and history

Official source

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