New Hampshire NH SAS Science - High School Practice Questions - New Hampshire Statewide Assessment System Science - High School (Second Year Of High School) Exam

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A student stirs powdered calcium carbonate into 50 mL of dilute hydrochloric acid and observes bubbles of carbon dioxide. Which change to the reaction conditions would most directly increase the rate of gas production by increasing the frequency of effective collisions between reacting particles?

Grinding the calcium carbonate into a finer powder before adding it Cooling the acid to 5 °C before adding the carbonate Using a larger flask with the same volumes of acid and carbonate Diluting the acid with an equal volume of water

Correct Answer:

Grinding the calcium carbonate into a finer powder before adding it

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