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Ch. 2-2

Ch. 2-2. Properties of Water. Water Molecule. Cohesion – water molecules stick together Adhesion – water molecules stick to other substances. Mixture. Mixture – material composed of two or more elements or compounds Mix together but do not chemically combine

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Ch. 2-2

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  1. Ch. 2-2 Properties of Water

  2. Water Molecule • Cohesion – water molecules stick together • Adhesion – water molecules stick to other substances

  3. Mixture • Mixture – material composed of two or more elements or compounds • Mix together but do not chemically combine • Example – salt and pepper, cinnamon and sugar, air • Solutions and suspensions are mixtures

  4. Solutions • All components are evenly distributed • Solute – what is being dissolved • Solvent – what is dissolving • Example: Saltwater • What is the solvent? • What is the solute? • Example: Kool-aid • What is the solvent? • What are the solutes?

  5. Suspensions • Water and nondissolved material • Example: Italian salad dressing • What doesn’t dissolve? • Example: orange juice • What doesn’t dissolve?

  6. Acids, Bases, and pH • pH scale – measures how acidic or basic a solution is • Goes from 0-14 • Acids • 0-6.9 on the pH scale • When dissolved, form hydrogen (H+) ions • Example: HCl • Bases • 7.1 – 14 on the pH scale • When dissolved, form hydroxide (OH-) ions • Example: NaOH

  7. Acids, Bases, and pH • The pH scale indicates strength • The farther from 7, the stronger it is

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