Author: Study Clue

In a first-order reaction, concentration drops from 0.80 M to 0.10 M in 40 min at constant temperature. The rate

For a first-order reaction, if the half-life is 10 min, the rate constant is closest to which value? A 0.069

For a first-order reaction, if the rate constant is 0.20 s⁻¹, the half-life is closest to which value? A 3.5

When rate is written as −d[A]/dt, the minus sign is used because reactant concentration decreases with time. A B. Product

In chemical kinetics, “rate of reaction” usually means the change in concentration of a reactant or product per unit time.

In acidic medium, balancing the half-reaction MnO₄⁻ → Mn²⁺ requires adding on reactant side A B. 5H⁺, 8e⁻ B C.

In alkaline medium, MnO₄⁻ is commonly reduced to manganate ion having formula A Mn²⁺ ion B MnO₂ solid C Mn³⁺

When chlorine reacts with cold dilute NaOH, chlorine undergoes A Disproportionation B Only oxidation C Only reduction D No redox

In an oxidation-number approach, the total increase in oxidation number must equal the total A Charge of solution B Decrease

In redox reactions, oxidation is best defined as A Gain of electrons B Decrease in oxidation number C Loss of