It has more surface area.
Dissolving will depend on surface area. Castor sugar has a smaller particle than regular sugar. The smaller the particle the larger the surface area. Surface area: Regular sugar < castor sugar < icing sugar. Castor sugar should dissolve faster than the same mass of regular sugar but slower than the same mass of icing sugar.
Not really; sugars other than powdered do not dissolve when used in a mixture that is not heated (such as icing). If the recipe already involves brown sugar, you can increase the quantity slightly without too many side-effects. However replacing powdered sugar (completely) with brown is likely to yield undesirable results; powdered sugar helps add 'smoothness' to icing, so without this you may end up with a very brown granular icing (that may not set adequately). If the recipe does not call for brown sugar at all, definitely do not add it.
The hotter it is the faster the molecules will move away from each other
Natural sugars usually ferment faster in yeast than artificial sugars because they contain a more balanced ratio of glucose and fructose, which are easily metabolized by the yeast. Artificial sugars, on the other hand, may be more difficult for yeast to ferment due to their chemical composition.
It doesn't. The amount of time it takes for a tablet to dissolves depends on the tablet brand. Some brand names dissolve faster but some other tablets can dissolve faster.
Salt will dissolve faster in liquids than sand. Salt is a solute that is able to break down and mix with the liquid, forming a homogeneous solution. Sand, on the other hand, is insoluble and will not dissolve in liquid.
Ink will dissolve faster in warm water compared to cold water. This is because warm water molecules have more energy, allowing them to interact more readily with the ink particles and break them down.
No, sugars are polar molecules considering that they will interact and dissolve in water (which is also a polar molecule). Polar molecules will only interact with other polar molecules and vice-versa.
Fondant goes over icing that has been on a cake in the fridge.
Sugar dissolves in a liquid faster than salt does. The reason is that sugar is less dense as a solute than salt is, leading to it dissolving in the solvent faster as it would fit into the 'empty gaps' that the solvent has at a much faster rate, which is how substances dissolve.
In hot water the water molecules are moving at a faster rate than they move in cold water. The faster moving molecules hit the salt molecules with greater force and knock them away from the other salt molecules faster. That way the salt molecules dissolve in the water quicker.
A sugar-free mint would likely dissolve faster than a regular mint because sugar can take longer to dissolve than other ingredients in the mint. The absence of sugar allows the sugar-free mint to dissolve more quickly in comparison.