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CH. 2-2 IN CLASS NOTES PROPERTIES OF WATER. Water, Water Everywhere If you have ever seen a photograph of Earth from space, you know that much of the.

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Presentation on theme: "CH. 2-2 IN CLASS NOTES PROPERTIES OF WATER. Water, Water Everywhere If you have ever seen a photograph of Earth from space, you know that much of the."— Presentation transcript:

1 CH. 2-2 IN CLASS NOTES PROPERTIES OF WATER

2 Water, Water Everywhere If you have ever seen a photograph of Earth from space, you know that much of the planet is covered by water. Water makes life on Earth possible. If life as we know it exists on some other planet, water must be present to support that life. Section 2-2 Interest Grabber Go to Section:

3 1. THE WATER MOLECULE H 2 O NEUTRAL-10 P & 10E BENT SHAPE P. 40

4 2. WATER IS A POLAR MOLECULE O-SLIGHT NEG. CHARGE H-SLIGHT POS. CHARGE MOLECULES IN WHICH THE CHARGES ARE UNEVENLY DISTRIBUTED LIKE A MAGNET W/ POLES ---=_____ & += BETWEEN_____

5 3. HYDROGEN BONDS-------- NOT AS STRONG AS IONIC OR COVALENT(STRONGEST) POLAR MOLECULES ATTRACT EACH OTHER— BECAUSE PARTIAL + / -

6 4. PROPERTIES OF WATER A. SINGLE MOLECULE MAY HAVE 4 H-BONDS AT THE SAME TIME B. COHESION-ATTRACTION BETWEEN MOLECULES OF THE SAME SUBSTANCE EX. WATER BEADS

7 C. ADHESION ATTRACTION BETWEEN MOLECULES OF DIFFERENT SUBSTANCES EX: READING A GRAD. CYL.; CAPILLARY ACTION IN PLANTS ADHESION BETWEEN WATER & GLASS IS STRONGER THAN WATER VS. WATER

8 D. MIXTURE 2 OR MORE ELEMENTS OR COMPOUNDS THAT ARE PHYSICALLY MIXED EX: SALT/PEP. STIRRED EARTH’S ATMOSPHERE

9 E. 2 TYPES OF MIXTURES WITH WATER 1. SOLUTIONS-all the compounds are evenly distributed throughout a. solute-substance dissolved (salt) b. solvent-substance in which the solute is dissolved (water)

10 Cl - Water Cl - Na + Water Na + Section 2-2 Figure 2-9 NaCI Solution Go to Section:

11 Section 2-2 Figure 2-9 NaCI Solution Go to Section: Cl - Water Cl - Na + Water Na +

12 2. SUSPENSIONS Water & nondissolved material; when some materials do not dissolve Ex. Blood & components

13 DOUBLE ARROW MEANS….. THE REACTION CAN OCCUR IN BOTH DIRECTIONS ARROW MEANS “FORMS” OR “PRODUCES”

14 CHEMICAL EQUATION H 2 O H + + OH — REACTANTS PRODUCTS BEFORE AFTER

15 Oven cleaner Bleach Ammonia solution Soap Sea water Human blood Pure water Milk Normal rainfall Acid rain Tomato juice Lemon juice Stomach acid Neutral Increasingly Basic Increasingly Acidic Section 2-2 pH Scale Go to Section:

16 1. What is pH used for? To determine acids, bases and neutral substances

17 2. What does the pH value 7 mean? There is an equal number of H+ ions and OH- ions. Example: pure water; neutral

18 3. Substances with a pH value above 7 are considered bases. Under 7 are considered acids

19 4. What is the purpose for using a known base, a known acid, and distilled water? The control part of the lab. To make sure the pH paper is working properly.

20 5. ACIDS, BASES AND pH A water molecule can react to form ions. H 2 O H + + OH — Water forms hydrogen +hydroxide ion

21 6. pH Scale= Potential or Power of Hydrogen Indicates the concentration of H+ ions in a solution Ranges from 0-14 pH 7= H+ and OH- are equal--- ---pure water=7 NEUTRAL

22 7. Acidic-any compound that forms H+ ions in solution pH below 7, more H+ ions than OH- ions The lower the pH the greater the acidity Ex: HCl-hydrochloric acid In your stomach=______

23 8. Base-any compound that produces OH- ions in a solution A.K.A= Alkaline Lower concentrations of H+ ions than water, more OH- ions pH value above 7 Ex: oven cleaner=_______

24 E. BUFFERS WEAK ACIDS OR BASES PREVENT SHARP CHANGES IN pH Human body cells-pH 6.5-7.5-homeostasis


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