Chemistry 9701 · AS & A Level · Atoms, molecules and stoichiometry

Atoms, molecules and stoichiometry — practice question

Marble chips are reacted in large excess with $25\,\text{cm}^3$ of $1.0\,\text{mol dm}^{-3}$ hydrochloric acid at $40^{\circ}\text{C}$. What difference is observed when the reaction is repeated using $60\,\text{cm}^3$ of $0.5\,\text{mol dm}^{-3}$ hydrochloric acid at $40^{\circ}\text{C}$?

  • AThe reaction is faster and more of the products are made when the reaction is complete.
  • BThe reaction is faster and less of the products are made when the reaction is complete.
  • CThe reaction is slower and more of the products are made when the reaction is complete.
  • DThe reaction is slower and less of the products are made when the reaction is complete.

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