Transcript Understanding Solutions

Understanding Solutions
Chapter 7 section 1
What is a Solution
• Solution: Is a uniform mixture that contains a
solvent and at least one solute.
• Solvent: The part of solution present in large
amount.
• Solute: Is the substance that is present in a
solution in smaller amount and is dissolved by
the solvent.
• A solution contains particles that are too small to
see and it had the same properties throughout.
• Dissolving one substance into another is
an example of Physical change.
• Water is a universal solvent meaning it can
dissolve many substances in it.
• Many other solutions are made with
substances other than water example:
Brass, Gasoline, Air (solid, liquid and gas).
Colloids and Suspensions
• Not all mixtures are solutions
• Colloids: Is a mixture that contains small,
undissolved particles that do not settle out.
A colloid contains large particles than a
solution. The particles are still too small to
be seen easily, but large enough to scatter
light beam. Examples: Milk, Fog, Gelatin,
mayonnaise, shaving cream.
• Suspensions: Is a mixture in which
particles can be seen and easily separated
by settling or filtration. A suspension does
not have the same properties throughout.
It contains visible particles that are larger
than the particles in solutions or colloids.
Example: Snow globe
Particles in a Solution
• When a solution forms, particles of the
solvent surround and separate the
particles of the solute.
• Solutions of ionic compounds conduct
electric current.
• Solutions of Molecular compounds do not
conduct electric current.
Effects of Solutes on Solvents
• Solutes lower the freezing point and raise
the boiling point of a solvent.