Rate of reaction A + B -> products doubles when [A] is doubled and quadruples when [B] is doubled. If both concentrations are doubled together, the rate changes by what factor?
Answer and explanation
Correct answer: B. 8, because the order is 1 in A and 2 in B, so the factors multiply: 2 x 4
- Step 1: Doubling A multiplies rate by 2 (first order in A). Step 2. Doubling B multiplies rate by 4 (second order in B). Step 3. Effects multiply: 2 x 4 = 8. Answer: 8. Why not the others: factors multiply rather than add, the larger factor does not dominate, and 16 would need second order in both.
Practise more Biological and Physical Science Reasoning.
Free questions with an explanation for every one, and full timed GAMSAT (Graduate Medical School Admissions Test) mock tests.
More Biological and Physical Science Reasoning questions
- Which structure in a eukaryotic cell is the main site of ATP production by oxidative phosphorylation?
- A competitive inhibitor is added to an enzyme-catalysed reaction. Compared with the uninhibited reaction, which change is seen in the kineti…
- In a population in Hardy-Weinberg equilibrium, an autosomal recessive condition affects 1 person in 2500. Approximately what proportion of p…
- What is the pH at 25 degrees C of a 0.0010 M solution of barium hydroxide, Ba(OH)2, assuming complete dissociation? (log 2 = 0.30)
- A fixed mass of ideal gas in a rigid container is heated from 300 K to 600 K. What happens to its pressure?
- 2.0 mol of an ideal gas occupies 4.1 L at 300 K. What is its pressure? (R = 0.0821 L atm per mol per K)