Hot water has the energy(heat) to make the change go faster
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Adding cold water helps to dissolve the jelly crystals evenly without forming lumps. This ensures a smooth texture and helps the jelly set properly. Additionally, cold water helps to cool down the mixture faster, speeding up the setting process.
Instant coffee granules dissolve faster in hot water than in cold water.
Even in cold water sugar will dissolve eventually, but it does dissolve faster in hot water. Hot water molecules move faster than cold water molecules and therefore can more easily break sugar molecules out of solid sugar and into solution.
Hot water will make sugar dissolve faster compared to cold water because the increased temperature causes the sugar molecules to move more rapidly and interact with the water molecules more effectively.
Salt will dissolve faster in hot water compared to cold water. This is because the heat in the hot water speeds up the movement of the water molecules, allowing them to interact more readily with the salt particles and dissolve them quicker.