It takes 1 minute for a certain amount of potassium bromide (KBr) to dissolve in 100 grams of water at 25 °C.

Question

Which of the following will most likely happen if the same sample of potassium bromide is dissolved in 100 grams of water at 100 °C? (5 points)

a
The sample will dissolve in exactly 1 minute.

b
The sample will dissolve in less than 1 minute.

c
The collision between particles of the sample will decrease.

d
The collision between particles of the sample will remain constant.

Answer 1

When potassium bromide (KBr) is dissolved in water at a higher temperature, such as 100 °C, several factors come into play. Generally, an increase in temperature increases the kinetic energy of the particles, leading to more frequent and energetic collisions between the KBr and water molecules. This higher energetic environment typically results in increased solubility and faster dissolution rates.

Given these considerations, the most likely outcome when dissolving the same sample of potassium bromide in 100 grams of water at 100 °C as compared to 25 °C is:

b. The sample will dissolve in less than 1 minute.

This option is correct because the increased temperature will enhance the dissolution process and lead to a faster dissolving time.