Convert 7.6 × 105 cal to kiloJoules
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Answer:
Explanation:
Tarnish ing
Tarnishing is a chemical property.
One substance changes into another substance with different properties. For example, the tarnish on silverware is formed by the reaction of silver with hydrogen sulfite to form black silver sulfide.
2Ag + H₂S ⟶ Ag₂S + H₂
Freezing
Freezing is a physical property, because the composition of the substance does not change. After liquid water has frozen to ice, it is still water, but in the solid state.
H₂O(ℓ) ⇌ H₂O(s)
Rusting
Rusting is a chemical property, because a new substance with different properties is formed.
A simple equation for the formation of rust is
2 Fe + 3O₂ + H₂O ⟶ Fe₂O₃·H₂O