During an investigation, similar effervescent tablets were dropped into a beaker containing cold water and a beaker containing warm water. The table below shows an incomplete record of the investigation.

Question

Investigation Results
Beaker Time Taken for the Tablet to Dissolve
(seconds)
Cold Water (50 ml) 68
Warm Water (50 ml) ?
Which statement best explains the time taken for the tablet to dissolve in warm water?

Group of answer choices

More than 68 seconds as the rate of reaction is lower for cold water

Less than 68 seconds as the rate of reaction is higher for cold water

Less than 68 seconds as the rate of reaction is higher for warm water

More than 68 seconds as the rate of reaction is lower for warm water

Answer 1

The correct statement is:

Less than 68 seconds as the rate of reaction is higher for warm water.

Explanation: The dissolution rate of effervescent tablets is generally faster in warm water compared to cold water. This is due to higher kinetic energy of particles in warm water, which leads to increased collisions between the water molecules and the tablet, facilitating the reaction and dissolution process. Therefore, the time taken for the tablet to dissolve in warm water is expected to be less than that in cold water.