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SAT® Subject Test in Chemistry

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Difficult

Rel Analysis: Reaction Speed

SATCHM-EXH6FY

$$Na_2S_2O_3(aq) + HCl(aq) → S(g) + SO_2(g) + 2NaCl$$

I. The reaction of 50.0mL of 0.1M sodium thiosulfate and 5.0mL 2M $HCl$ will go to completion more quickly than the reaction of 50.0mL of 0.05M sodium thiosulfate and 5.0mL 2M $HCl$.

BECAUSE

II. Higher concentrations of reactants cause the frequency of effective collisions to increase.

A

Statement I is true, Statement II is true

B

Statement I is true, Statement II is false

C

Statement I is false, Statement II is true

D

Statement I is false, Statement II is false

E

Statement I is true, Statement II is true and is a correct explanation of the phenomena described in I