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Background About Solutions Need To Know p. 220. What is a solution? Uniform mixtures of 2 or more substances. – Solid, liquid, or gas What do we mean.

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Presentation on theme: "Background About Solutions Need To Know p. 220. What is a solution? Uniform mixtures of 2 or more substances. – Solid, liquid, or gas What do we mean."— Presentation transcript:

1 Background About Solutions Need To Know p. 220

2 What is a solution? Uniform mixtures of 2 or more substances. – Solid, liquid, or gas What do we mean when we say a solution is UNIFORM?

3 Which picture represents a uniform mixture? A B

4 Substances that Make up A Solution Solvent: Substance that is doing the dissolving. Solute: Substance being dissolved.

5 3 Types of Solutions  Isotonic (iso = equal)  Hypertonic (hyper = over)  Hypotonic (hypo = under)  Used to describe the external environment of a cell!

6 Isotonic Solutions Solution provides an environment in which the concentration of solutes outside the cell equals the concentration inside. Cell will stay the same size.

7 Hypertonic Solution The concentration of solutes is greater outside a cell is greater than the concentration inside. Causes water in the cell to diffuse out! Cell shrinks.

8 Hypotonic Solution The concentration of solutes outside the cell is less than the concentration inside the cell. Causes water to diffuse into the cell. Cell gets larger!

9 Tonicity of Plant & Animal Cells

10

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