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Zorluk: OrtaProperties of Matter

During a cold-storage maintenance procedure, a technician handles solid dry ice (solid CO2\text{CO}_2) and observes it converting directly into carbon dioxide gas at room temperature without forming any liquid. Which term correctly describes this phase transition, and is it classified as a physical or chemical change?

  1. A
    Evaporation, which is a chemical change because intermolecular forces are broken to create a gas.
  2. Sublimation, which is a physical change because the chemical identity of the substance remains unchanged.Cevap
  3. C
    Sublimation, which is a chemical change because the substance undergoes a complete change in state.
  4. D
    Condensation, which is a physical change because heat energy is absorbed during the transition.

Cevap

Sublimation, which is a physical change because the chemical identity of the substance remains unchanged.
The transition directly from a solid state to a gaseous state is known as sublimation. Because the chemical composition of dry ice remains carbon dioxide (CO2\text{CO}_2) throughout the process and no new chemical substances are produced, the transition is strictly a physical change.

Adım Adım Çözüm

1
Identify the specific phase transition occurring from solid to gas.
The direct phase change from a solid to a gas without passing through the liquid phase is defined as sublimation.
Understanding standard phase change terminology classifies the transition correctly.
2
Classify whether the process represents a physical change or a chemical change.
Physical change.
The molecules before and after the transition remain CO2\text{CO}_2. Because no chemical bonds within the molecules are formed or broken to create new substances, it is a physical change.

Anahtar Kavram

Phase Transitions and Physical vs. Chemical Changes
Tahmini Süre:45s
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Properties of Matter

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