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The solute becomes less ordered

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The solute becomes less ordered.

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Q: What causes the entropy to change when the solute dissolves in a solvent?
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What causes entropy to change when a solute dissolves in a solvent?

The solute becomes less ordered. (apex)

When sugar dissolves es in water is the change in entropy positive or negative?


In thermo-dynamics such a change causes an increase in entropy?


Energy transfer that causes a change in temperatureWhat term refers to an energy transfer that causes a change in temperature?


Is iodine dissolves in alcohol a chemical or physical change?

Dissolving (as such) of solutes in a solvent is physical.

How does an increase in surface area help a solute dissolve more quickly?

Not necessarily just changing the surface area causes the rate to change. Changing the ratio of surface area volume changes the rate at which a solute dissolves in a solvent. If the surface area is larger and the volume of a solute is smaller or the same, then the rate at which the solute dissolves in a solvent increases. If the surface area is smaller and the volume of the solute is larger or the same, then the rate at which the solute dissolves in a solvent decreases.

Why NaCl is very soluble but not CaO is only slightly soluble in water?

Its all to do with enthlapy and entropy. Anything which is soluble usually has a negative standard enthlapy of solution - the energy involved when 1 mole of solute dissolves in a solvent to give an infinately dilute solution. However, NaCl has a slightly positive enthalpy of solution, yet it dissolves. The reason for this is entropy - the change in the amount of disorder. When NaCl dissolves in solution, there is more chaos, more molecules within the solution. Any process that has a large positive entropy change will be favourable - spontaneous and can occur (reaction will 'go'). However, with CaO, the Ca2+ formed in solution has a high affinity (attraction to) for water molecules, hence a lot of water molecules are arranged orderly - less chaos and hence a negative entropy. This should in effect make the compound insoluble, however, the slight solubility is due to it still having a negative enthalpy change of solution - hence despite entropy it is still slightly soluble. (You may be asking how is dissolving CaO possible if entropy is negative? The entropy of the system maybe negative, but the entropy of the surroundings is positive (dissolving gives out heat - exothermic), hence the overall entropy (sum of both entropies) is positive and the reaction will 'go'.

Why does Milo dissolve in hot milk?

it is a physical change not a chemical change. milo dissolves into hot milk because it is a super saturated solvent.

Entropy change for dissolving salt in water?

This question isn't very complete, but if you meant what is the solute or solvent, the water would be the solvent because there is more water than salt. In this case, the salt is the solute. If there...

If something dissolves into something else will it change mass?

The mass of the solution will be equal to the mass of the solute plus the mass of the solvent. However, the total mass does not change.

What is true about entropy?

Entropy is not change. Entropy is disorder.

Function of entropy in climate change?

The climate is not affected by entropy.