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Zorluk: KolayChemical Reactions and Compounds

An automotive technician observes several processes taking place in a workshop. Which of the following processes is an example of a chemical change?

  1. A
    The evaporation of spilled degreaser on the concrete floor
  2. The rusting of an iron vehicle frame exposed to moistureCevap
  3. C
    The melting of solid solder wire using a heated soldering iron
  4. D
    The grinding of a steel brake rotor into fine metal shavings

Cevap

The rusting of an iron vehicle frame exposed to moisture
The rusting of an iron frame represents a chemical reaction (oxidation) where metallic iron combines with oxygen and water to synthesize a new compound, iron oxide. Because a new chemical substance with unique properties is created, it is a chemical change.

Adım Adım Çözüm

1
Differentiate between physical and chemical changes.
A physical change alters form, state, or appearance without changing chemical identity. A chemical change produces one or more new chemical substances through the breaking and forming of bonds.
Establishing the core scientific definitions allows accurate classification of each workshop process.
2
Analyze the process involving the formation of rust on iron.
Iron (FeFe) reacts with oxygen (O2O_2) and moisture (H2OH_2O) to form hydrated iron(III) oxide (Fe2O3⋅nH2OFe_2O_3 \cdot nH_2O), which is a brand-new compound.
Since a new chemical compound with distinct properties is formed, the process is definitively a chemical change.

Anahtar Kavram

Chemical change involves a transformation where original substances combine or break down into new substances with different chemical properties.
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Konular

Chemical Reactions and Compounds

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