Question

predict the average dissolving time if the substance was placed in boiling hot water (100°c)
73 seconds
12 seconds
49 seconds
151 seconds

Explanation:

Step1: Analyze the relationship between water temperature and dissolving time

As the temperature of water increases, the average dissolving time decreases. For example, cold water (\(2.1^{\circ}C\)) has an average dissolving time of \(120.5\) seconds, room - temperature water (\(23.9^{\circ}C\)) has \(38.3\) seconds, and hot water (\(50.0^{\circ}C\)) has \(24.4\) seconds. Boiling water (\(100^{\circ}C\)) is much hotter than the \(50^{\circ}C\) water in the table.

Step2: Predict based on the trend

Since the trend is that higher temperature leads to lower dissolving time, and \(100^{\circ}C\) is significantly hotter than \(50^{\circ}C\), among the given options, \(12\) seconds is the most reasonable as it is less than the dissolving time of \(50^{\circ}C\) water (\(24.4\) seconds). The other options (\(73\) seconds, \(49\) seconds, \(151\) seconds) either do not follow the temperature - dissolving time trend (e.g., \(151\) seconds is longer than cold - water dissolving time) or are not in line with the expected decrease from the \(50^{\circ}C\) data.

Answer:

12 seconds