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Water & Solutions

Water possesses remarkable properties that make it vital for life on Earth. One such property is that ice floats due to its less dense structure when frozen, which allows ecosystems to thrive. Furthermore, water can absorb and retain heat, maintaining stable temperatures essential for living organisms. Its cohesive nature allows water molecules to stick together, while adhesion enables water to interact with other substances, aiding in processes like nutrient transport in plants. Understanding these properties highlights the critical role of water in our world.

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Water & Solutions

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  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

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