Question

which combination of factors will result in the fastest reaction rate? 0.5 m hcl at 25 °c with zn foil 1.0 m hcl at 35 °c with zn powder 0.5 m hcl at 15 °c with zn powder

Explanation:

Step1: Analyze reactant concentration

Higher concentration (1.0 M HCl) increases reaction rate compared to lower (0.5 M), as more reactant particles collide.

Step2: Analyze temperature

Higher temperature (35 °C) increases rate, as particles have more kinetic energy for collisions.

Step3: Analyze surface area

Powdered Zn has larger surface area than foil, increasing collision frequency.

Step4: Combine factors

1.0 M HCl (high conc.), 35 °C (high temp.), and Zn powder (large surface area) maximize collision frequency and energy.

Answer:

1.0 M HCl at 35 °C with Zn powder