When frozen carbon dioxide (CO2) is heated, it changes directly into a gas. Which statement BEST
indicates that a physical change has taken place?
a. Heat caused an increase in gas production.
b. Heat caused a new substance to form.
c. Heat caused a decrease in energy.
d. Heat caused a change in state.
Answers: 1
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When frozen carbon dioxide (CO2) is heated, it changes directly into a gas. Which statement BEST
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