1. Water & Solutions

2. Water’s Special Properties! #1- Ice Floats When water freezes, its structure locks air pockets in. This makes water less dense as a solid than as a liquid. Question: How would our Earth be different if it didn’t float?

3. Special Property #2 Water absorbs and retains heat. – How does this affect living organisms? – HINT: What is your body temp?

4. Special Property #3 Water molecules stick to each other. (Cohesion) -Water can stay a liquid at room temp. because it sticks together!

5. Special Property #4 Water molecules stick to other polar substances. (Adhesion) Fig. 5 on p. 55 – The water is moving up the stem of the plant.

6. Key Terms: Cohesion- The attraction of particles of the same substance. Adhesion- The attraction of particles of different substances. Solution- A mixture, in which 2 or more parts are evenly dissolved. (Has a solute & solvent.) – Solute- This part dissolves. – Solvent- This part does the dissolving.

7. Key Terms cont. Acid-Substances that give off H + ions in water. Bases-Substances that give off OH - ions in water. pH- The measure of how acidic or basic a substance is. Buffer- Prevents pH changes in a substance. Look at p. 57