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N H 2 O Na K

Warm up 9/19 & Lab Turn in* Identify the following symbols & identify whether they are Elements (E) or Compounds (C). N H 2 O Na K. H 2 SO 4 HCl Cl NaCl. Write the equation: H 2 O+ H +  H 3 O + What are the products and what are the reactants ?

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N H 2 O Na K

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  1. Warm up 9/19 & Lab Turn in*Identify the following symbols & identify whether they are Elements (E) or Compounds (C). • N • H2O • Na • K • H2SO4 • HCl • Cl • NaCl Write the equation: H2O+ H+ H3O + What are the products and what are the reactants? *Staple pages 63-65 and put in basket in rear of classroom.

  2. ACIDS, BASES, AND pH pp. 39-44

  3. WaterPolar (covalent) compound • acts like a magnet with + attracted to – • pulls apart molecules like NaCl (ionic bond) Water has a positive (+) and negative (-) “pole” (+) is due to H and (-) is O

  4. WaterBonding covalent bonds hold H2O together hydrogen bonds hold molecules of H2O Covalent > Hydrogen

  5. Acids and Bases H2O = water H+ = hydrogen ion OH- = hydroxide ion

  6. Acids and Bases • H2O  H+ + OH- • H+ reacts with H2O H2O + H+ H3O+ (hydronium) • H3O+ more commonly written as H+

  7. Acids Acids: H+ > OH- pH less than 7 Acid Properties: tastes sour, highly corrosive EX. HCl, H2SO4

  8. Bases Bases: OH- > H+ pH more than 7 Base Properties: tastes bitter, feel slimy EX. NaOH, Mg(OH)2

  9. pHpower of Hydronium • measures acidity (from 0-14) and how much H3O+/H+ is present. The closer to 0, the more the H3O +/H+ 0 up to 7 = acid 7 = neutral over 7 = base/alkaline • Can use indicators to tell the pH ( phenol red, pH paper, litmus, BTB)

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