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During this Unit
This unit focuses on the properties of water solutions and the factors affecting solid solubility. Students relate water’s polar structure to its ability to dissolve many types of solutes. Students will conduct investigations to determine the properties of water solutions.
Misconceptions:
Students may think that substances dissolved in water simply disappear rather than one substance being incorporated into another and the mass of both substances conserved.
Students may think that stirring a solute-solvent mixture or increasing the surface area of the solute will increase its solubility within a solution, rather than understanding that these methods only increasing the rate of dissolving, not the solubility of the solute.
Underdeveloped Concepts:
Students may not understand that dissolving is a different process than melting.
Key Content Vocabulary:
Concentration – a measure of the amount of a solute dissolved per unit of volume of a solvent
Dissolving – the process of making a solution by mixing a solute with a chemically compatible solvent
Polar molecule – a molecule in which the component atoms have different and unequal attractions for electrons, resulting in a positive and negative ends, or poles; water, H2O, is a polar molecule, with the oxygen end being negative
Saturation – the quality of a solution that is determined by a comparison of the amount of solute dissolved to the maximum amount of solute that can dissolve in a given volume of a solvent
Solubility – the quantity of a substance that dissolves in a given quantity of a particular solvent; usually measured in g/L or g/100 mL; solubility is dependent on the temperature of the solvent
Solute – the substance being dissolved in a solvent
Solution – a homogeneous mixture in which the particles of one or more solutes are uniformly dispersed (spread out) throughout a solvent
Solvent – the substance in which a solute is dissolved
Related Vocabulary:
Concentrated
Concentration
Dilute
Saturated
Supersaturated
Temperature
Universal
Unsaturated
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Editable PowerPoint - Matter