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Which equation represents a spontaneous reaction?

August 2019 NY Regents Chemistry Exam



47. Which equation represents a spontaneous reaction?



Solution: Table J on the Reference Table shows metals from the most active to the least active. When a more active metal reduces a less active metal, the reaction will be spontaneous. For example, in choice 1, Ca is lower than Ba on Table J and would not be able to reduce it.

Answer: 4


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