You need…

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½ sheet of paper

Survey – ½ sheet of paper

• Answer the following questions on your ½ sheet of paper. You do not need to re-write the question, but write using complete sentences

1. How does it feel to be almost done with middle school?

2. What has been your favorite moment at BTMS so far?

1. Heterogeneous mixtures• All components of the mixture are

visible because they do not mix together

• Particles not distributed evenly

EX: sand and water vegetable soup oil and water

2 types of mixtures

2. Homogeneous mixtures• Components cannot be

distinguished from each other, appear as one substance

• Particles distributed evenly throughout

• Is also called a solution

2 types of mixtures

SOLUBILITY• Every chemical substance which dissolves in

water has a fixed solubility. – If it does not dissolve, solubility = zero.

• Many of these solublities have been measured and special charts are produced displaying solubility of many substances at once.

SOLUBILITY• Because different amounts of

solute can be dissolved in a solvent, we look at a solution’s SOLUBILITY.

• Definition: The maximum amount of solute that can be dissolved in a given amount of solvent at a specific temperature.

• Usually expressed as the number of grams of solute per 100mL of solvent.

• Solute: the one that gets dissolved – smaller amount

• Solvent: the one that dissolves the other substance – greater amount

• Suspension: solution that includes solid particles that might not dissolve – you can use distillation to separate the solute and solvent

Homogeneous Mixtures = Solutions

Solution terminology:o Saturated:

Maximum amount of solute dissolved in solvent

o Unsaturated:

Less than maximum amount of solute dissolved in solvent

o Supersaturated:

More than maximum amount of solute dissolved in solvent

o Dilute:

to make less concentrated

As temperature increases, solubility increases.

This is because there is more space between solvent particles, making more room for solute particles.

Solubility Curves