Review Quiz and Introduction to
Acids/Bases/pH Scale
Review
1. What is an ion?
1. An ion is an atom that has lost or gained an electron
2. What is a chemical reaction? Click Here to See a Chemical Reaction
2. A chemical reaction is the process by which one or more substances
change to produce one or more different substances
3. What is a cation?
3. A cation is a positively charged ion
4. What is a Chemical Equation
4. A shorthand of a chemical reaction using chemical formulas and
symbols
Ex: C+O2CO2
reactants
products
5. What is an anion
5. An anion is a negatively charged ion
Need extra help?
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Go to Chemistry tutorials at
http://www.wwnorton.com/chemistry/home.
htm
Go to the online text at http://my.hrw.com
Go to the class website at
www.classhomework.com
Back
Acids
Reaction:
Produce H+ (as H3O+) ions in water
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Acids contain H+ cations, that react with
metals and produce H gas.
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HCl + Na = NaCl + H(g)
Acid + Metal = Product + H Gas
Acids
Properties:
 Acids taste sour.
 Acids turn Litmus paper
RED
Corrode metals
React with bases to
form salts and water
Bases
Reaction:
 Bases contain an OH- anion, that react
with acids, producing liquid H2O.
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HCl + NaOH = H2O + NaCl
Acid + Base = Water + Product
See movie (on hardrive) on the Internet
Bases
Properties:
 Bases taste bitter.
 Bases feel slippery.
 Bases turn Litmus paper
BLUE.
 Produce OH- ions in water
 Taste bitter, chalky
 Are electrolytes
 React with acids to form
salts and water
Check for Understanding
Post your answers on the class
newsgroup.
Describe the solution in each of the
following as: 1) acid 2) base or 3)neutral.
A. ___soda
B. ___soap
C. ___coffee
D. ___ wine
E. ___ water
F. ___ grapefruit
Check for Understanding
Answers:
Describe each solution as:
1) acid 2) base or 3) neutral.
A. _1_ soda
B. _2_ soap
C. _1_ coffee
D. _1_ wine
E. _3_ water
F. _1_ grapefruit
Need Help
Common Acids & Bases
Acids:
 HCl
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In your tummy! Human
Digestive Acid
C6H8O7
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Citric Acid (Lemon)
C2H4O2
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Bases:
 NaOH
Acetic Acid/Vinegar
KOH
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Cleaners, soap,
Drano, and Hominy
Fertilizer
Mg(OH)2
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Stomach medicine,
Milk of Magnesia
Common Acids & Bases
pH scale
The pH scale orders acids and
bases.
Great Resource:
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Help and explanations can be found at
http://www.school-forchampions.com/science/chemacids.htm