‹ Back to the paper
Answer the following.
Suppose 50 bacteria are placed in a flask containing nutrients, so that they can multiply. A study…
Suppose 50 bacteria are placed in a flask containing nutrients, so that they can multiply. A study at $35^\circ$C gave the following results:
The rate constant for the reaction is:
| Time (in minutes) | 0 | 15 | 30 | 45 | 60 |
|---|---|---|---|---|---|
| Number of bacteria | 100 | 200 | 400 | 800 | 1600 |
- (a)$0.0462\ \text{min}^{-1}$
- (b)$0.462\ \text{min}^{-1}$
- (c)$4.62\ \text{min}^{-1}$
- (d)$46.2\ \text{min}^{-1}$
Answer
Answer
AICorrect option: (a)
Answer: (a) $0\cdot0462\text{ min}^{-1}$
$t_{1/2} = 15\text{ min}$, so $k = \dfrac{0\cdot693}{t_{1/2}} = \dfrac{0\cdot693}{15\text{ min}} = 0\cdot0462\text{ min}^{-1}$.
From ISC 2023 Specimen Chemistry Paper 1, question 18(ii).