For the Reaction PCl₅ (G) ⇌ PCl₃ (G) + Cl₂

question 45

Multiple Choice

For the reaction PCl₅ (g) ⇌ PCl₃ (g) + Cl₂ (g) Kc = 0.0454 at 261°C. If a vessel is filled with these gases such that the initial concentrations are [PCl₅] = 0.2 M, [PCl₃] = 0.20 M, and [Cl₂] = 2.25 M, in which direction will a reaction occur and why?

• A) toward products because Q = 0.56
• B) toward reactants because Q = 1.8
• C) toward products because Q = 2.8
• D) toward reactants because Q = 0.0454
• E) it is at equilibrium because Q = 1

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Traits Evolve

The process by which characteristics or traits of organisms change over generations through natural selection and genetic drift.

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The ability of a species to continue existence and avoid extinction by adapting to environmental changes or overcoming threats.

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The idea that the natural laws observable around us now are also responsible for events in the past. One part of this view, for example, is the idea that Earth has been shaped by the cumulative action of gradual processes like sediment deposition and erosion.

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