Question

which combination of factors would result in the slowest reaction rate? 2.0 m nitric acid at 20° c with a silver ribbon 1.0 m nitric acid at 30° c with a silver ribbon 1.0 m nitric acid at 20° c with a silver ribbon

Explanation:

Step1: Recall reaction rate factors

Reaction rate depends on concentration, temperature, and surface area (here, silver ribbon is same, so surface area constant). Higher concentration and higher temperature increase reaction rate.

Step2: Analyze each option

• Option 1: 2.0 M (high conc), 20°C.
• Option 2: 1.0 M, 30°C (high temp).
• Option 3: 1.0 M (low conc), 20°C (low temp).

Lower concentration and lower temperature both slow reaction. So 1.0 M at 20°C will have slowest rate.

Answer:

1.0 M nitric acid at 20° C with a silver ribbon