when you mix together sugar and water the volume of the resultin g mixture is more than the sum of the volumes of the unmixed sugar and water
true or false
Answers
Answer:
Explanation:
For instance, the sugar is still in the container you used.
Now, a bit of chemistry lesson (perhaps more physical chemistry since it is the course during which I learned this stuff).
When you look at a mixture of two liquids or a solid-liquid mix (like this one) the most important thing to remember is that volumes are not necessarily additive, which means that mixing 1 L of a substance and 1 L of another doesn’t imply a 2L solution as a result. The final volume could be 2 L but, more commonly, it would be a little less or a little more than 2, depending on which and how many substances we are dealing with.
For example (this is very classic) mixing water with ethanol gives a final mix with a volume a little lower than expected. The property to discuss here is know as partial molar volume (which accounts for the variation in volume compared to common sense).
On the other hand, masses are always additive (mass cannot be created nor destroyed. So 1 g of sugar plus 100 g ow water give 101 g of solution).
What happens exactly? We must begin by assuming that we work at constant room temperature (dissolving something in a solvent strongly depends on temperature).
So when you add sugar to water, some of its molecules (of the sugar), with their pretty crystal shape, find a space between the molecules of water and they actually do not use extra space. So if you add just a small amount of sugar to water and stir it until it’s all gone, you will see that basically nothing changes and if so, it is barely measurable.
Adding more sugar will cause the new molecules to struggle in finding a place for their own, and since we have already reached maximum concentration, extra molecules will just deposit on the floor, since they are more complex, so “heavier” that the water molecules.
These extra sugar molecules, by creating a non-dissolved layer, increase water level and, therefore, water volume.
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