Aim:

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Aim
What is a compound?
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Objectives
Identify exactly how atoms combine together to
form compounds
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Vocabulary
Compound Chemical Change Physical Change
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Demonstration

• Mr. Z will heat some sugar in a test tube
• Sugar is C6H1206
• What do you see happens
• First the sugar turns into a liquid
• And then just black.
• The black is solid carbon C
• The O and H were released as a gas

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Chemical or physical Change ?

• Not sure
• Try putting the black residue on your breakfast
  cereal !

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Compund

• Is a new substance produced when two or more
  elements chemically combine
• The new compound will have physical and chemical
  properties that will be different from the
  original elements

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Example

• Pure Chlorine will kill you (Cl)
• Pure Chlorine is a gas at room temperature
• Who know what Chlorine is.
• Sodium (Na) also by itself is harmful
• Chemically combine the two and what do you get ?

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Example

• Sodium (Na) also by itself is harmful
• At room temperature, sodium will explode into a
  fire
• Chemically combine Chlorine and Sodium and what
  do you get

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Unlike Chlorine, salt wont kill you. Unlike
sodium, it will not burst into flames Salt has
its own unique properties Salt is a new compound
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Chemical Change
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Last Example

• Chemical change was two or more elements forming
  a new compound

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also a Chemical Change
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Last Example

• Chemical change was separating CHEMICALLY an
  existing compound into its original SEPARATE
  elements

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Question

• Can two compounds combine chemically to produce a
  NEW compound
• YES