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Which solids will dissolve?
Dayna Lee Martínez
STARS – USF
Maniscalco Elementary
Review
• Mixture– A mixture is a combination of two or more
substances that are not chemically combined and that can be separated.
– Could you give me an example?
• Homogeneous vs. heterogeneous mixtures– Homogeneous mixtures are of uniform
appearance – Heterogeneous mixtures consists of visibly
different substances
Solutions• Solution
– A solution is a group of molecules that are mixed up in a completely even distribution.
AlloysCarbonated
water
Chocolatemilk
Solute and Solvent• Solute
– A solute is the substance to be dissolved.
• Solvent – A solvent is the substance doing the dissolving.
Solubility• Solubility
– Ability of the solvent to dissolve the solute.
• Factors that affect solubility
Temperature PressureStructure ofthe substance
Classification of solutions
• Saturated solutions – have the maximum amount of solute dissolved in them.
No more solute can be made to dissolve.
• Unsaturated solutions – have less than the maximum amount of solute dissolved
in them. This means that more solute could be added to the solution and the additional solute would still dissolve.
• Supersaturated solutions – have more than the maximum amount of solute dissolved
in them. Not all substances will form supersaturated solutions.
http://genchem.chem.wisc.edu/demonstrations/gen_chem_pages/11solutionspage/crystallization_from_super.htm
Saturated
Unsaturated
Supersaturated
Suspensions• The particles in suspensions are larger than those
found in solutions. Components of a suspension can be evenly distributed by mechanical means, like by shaking the contents, but the components will settle out.
Chalk in water Dust in air
Which solids will dissolve?
At the end of today’s experimentwe will be able to answer this question for the following solids: sand, sugar, salt and baking soda