12.10 Concentration and reaction rate — Visual & Photo Quiz

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Questions count: 1
Passing grade: B+

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Look at the disappearing cross experiment (sodium thiosulfate + hydrochloric acid placed over a paper cross). Why does the black cross disappear faster when using higher acid concentration?

Higher concentration means more reactant particles per unit volume, increasing collision frequency and producing sulfur precipitate faster

Concentrated acid bleaches the black ink of the cross

Higher concentration makes the beaker glass opaque

The temperature drops to freezing