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Water Unit B: A Look at Water and It’s Contaminants

Water Unit B: A Look at Water and It’s Contaminants. 1B.Water Water Everywhere. ...But Not a Drop to Drink. Physical Properties of Water (B.1). Every substance has a set of unique physical and chemical properties that allows it to be differentiated (isolated) from ALL other substances.

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Water Unit B: A Look at Water and It’s Contaminants

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  1. Water Unit B: A Look at Water and It’s Contaminants

  2. 1B.Water Water Everywhere....

  3. ...But Not a Drop to Drink

  4. Physical Properties of Water (B.1) • Every substance has a set of unique physical and chemical properties that allows it to be differentiated (isolated) from ALL other substances

  5. Physical Property • A characteristic of a substance that is observable without changing what it is (color, odor, physical state, boiling/freezing points, etc..)

  6. Chemical Properties • A characteristic of a substance that describes how it interacts with other substances (solubility, flammability, reacts w/ acids and bases)

  7. Physical/Chemical Change • Physical Change: Does not change the what the substance is (i.e. state change, sample size, etc.) • Chemical Change: Original substance changes to another substance with different physical and chemical properties (shown by a change in temp, smell, color, gas formation, etc..)

  8. Physical Properties of Water • Colorless • Odorless • Tasteless • Unusually high boiling point (100° C) • Low Freezing Point (0° C) • Unusually High Surface Tension • Density of solid form LESS than liquid form

  9. UNUSUAL PROPERTIES OF WATER High SURFACE TENSION High BOILING POINT 100oC Low FREEZING POINT 0oC

  10. Density • D=M/V • How much mass in a certain volume

  11. Mixtures and Solutions (B.2) • Mixture: when two things are combined and retain their individual properties, large particles • Example: bird seed mixtures

  12. Terms • Heterogeneous: not completely uniform throughout • Oil and water • Homogeneous: Uniform throughout • Colored Water

  13. Terms (Cont) • Solute: The substance being dissolved • Solvent: the dissolving agent

  14. Solutions • Solution: Smallest solute particles • NaCl + H20 • Aqueous Solution:a solution in water • Salt water is aqueous • NaCl (aq)

  15. Colloids • Colloids: bridge the gap between solutions and suspensions, the particles are dispersed without bonding to solvent molecules, and they do not settle out on standing.

  16. Solution Small particle size does not separate on standing entire solution will pass through the filter mixture appears clear rather than cloudy solute is completely dissolved into the solvent solution shows an increase in boiling point/melting point Mixture Larger particle size Can/will separate on standing Can separate by filtering Can appear cloudy Solute is not dissolved in solvent Solution Vs Mixture

  17. WATER POLARITY

  18. ATOMS VS. MOLECULES

  19. DIATOMIC MOLECULES – AKA Mr. BrINClHOF

  20. Crystalline structure of Ionic compounds How do they dissolve?

  21. Density Test

  22. Tyndall effect • Property of a mixture which allows observer to see beam of light passing through mixture

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