Solutions

Do Now 9/29:

Take out homework (3-1 worksheet) so I can check it.

You have 5 minutes (and just 5) to do some quick studying for the quiz:

Elements, atoms, compounds, molecules

Parts of an atom

3 Types of atomic bonds

Solution: one substance dissolved in another

Solvent: The (liquid) substance that does the dissolving

Solute (pronounced Sahl-yoot): The dissolved substance

Solute Solvent

Hydrophilic substances “love water”

and dissolve easily

Hydrophobic substances “fear water” and don’t dissolve easily

The Dead Sea, in the Middle East, has the highest

concentration of salt of any body of water on Earth.

Concentration: How much of something is dissolved in solution

The solubility of a substance measures

the maximum amount that can

dissolve.

A saturated solution can’t dissolve any

more solute.

The golden rule: “Like dissolves like”

• Solvents are best at dissolving substances that are similar to themselves

• Water is polar, and is good at dissolving polar compounds.

• Non-polar solvents (like paint thinner or gasoline) are good at dissolving non-polar substances (like tar or oil)

• Hydrophilic compounds: polar or non-polar?

Homework

• Read p. 40

• Answer solution questions on back of notes.