When the Concentration of a Is Doubled,the Rate for the Reaction

question 162

Multiple Choice

When the concentration of A is doubled,the rate for the reaction: 2 A + B → 2 C quadruples. When the concentration of B is doubled the rate remains the same.Which mechanism below is consistent with the experimental observations?

• A)Step 1: A + B ⇌ D (fast equilibrium)
• Step 2: A + D → 2 C (slow)
• B)Step 1: A + B → D (slow)
• Step 2: A + D ⇌ 2 C (fast equilibrium)
• C)Step 1: 2 A → D (slow)
• Step 2: B + D → E (fast)
• Step 3: E → 2 C (fast)
• D)Step 1: 2 A ⇌ D (fast equilibrium)
• Step 2: B + D → E (slow)
• Step 3: E → 2 C (fast)

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Definitions:

High-Low Method

is a technique used in managerial accounting to estimate variable and fixed costs based on the highest and lowest levels of activity.

Variable Cost Per Unit

This is the cost that varies with each unit produced, including materials, labor, and other direct costs.

Total Fixed Costs

The sum of all costs that do not change with the level of output or activity within a certain period.

Cost-Volume-Profit Analysis

The examination of the relationships among selling prices, sales and production volume, costs, expenses, and profits.