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Changes of state at the particle level Original Scenario-Based Practice

Chemistry · Matter · Chemistry · Particle Model of Matter

1 Chemistry practice questions on Changes of state at the particle level. Questions built around original scenarios.

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  1. 1.

    During a deep-space exploration mission, specialist Mira monitors a transparent sealed chamber holding a solid crystalline fuel. As thermal energy is gradually introduced, she observes through a high-magnification sensor that the tightly packed particles, which were originally vibrating about fixed points, begin to slide past one another while still remaining in close physical contact. Which statement correctly describes the transformation occurring among the particles at this stage?

    • A) The substance is boiling because the individual particles expand in volume and break apart into smaller chemical fragments.
    • B) The substance remains in the solid state because particle spacing increases without any change in the arrangement or motion of the particles.
    • C) The substance is melting because the added energy partially overcomes the attractive forces holding the particles in fixed positions, allowing them to flow as a liquid.
    • D) The substance is undergoing sublimation because the particles absorb heat energy and immediately disperse widely to fill the entire container.

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