Compounds and Mixtures

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Compounds and Mixtures

• EQ How can I identify an element or a compound
  using a symbol and/or a formula?
• SPI 0807.9.3

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Ever Heard of Chemical Bonding??

• HINT Oxygen and Hydrogen undergo chemical
  bonding in order to become water!

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Chemical bonding is the joining of atoms to form
new substances.

• The properties of these new substances are
  different than the properties of the original
  elements.
• Example H2O

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For example, atoms of carbon, hydrogen, and
oxygen combine in different patterns to form
sugar and water.
C6H12O6
H2O
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When chemical bonds form, electrons are shared,
gained, or lost.
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Foldable
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Whats an element again??

• Element One or more of the same atoms NOT bonded
  together.

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Examples of Elements

• Gold Au

Oxygen O
Silver Ag
Aluminum Al
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Remember that elements will be written with only
ONE or TWO letters!!
Au
Ag
Hg
O
Cl
He
N
Al
Na
Mg
H
C
B
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Whats a Compound?

• Compound A pure substance made of two or more
  different elements chemically bonded together.

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Examples of compounds

• Carbon Dioxide CO2

• Water H2O

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Elements combine by reacting (undergoing a
chemical change).
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Whats a Mixture?

• MIXTURE A combination of two or more substances
  that are not chemically bonded.
• No chemical change happens when a mixture is
  made!
• Most natural substances are mixtures.

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Examples of Mixtures

• Tossed salad

A bowl of cereal
Oil and vinegar
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• Pizza

• Trail Mix

• Halloween Candy

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Mixtures can be separated!
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To Leave Class

• A (n) ______________ is a pure substance that
  cannot be broken down into simpler substances by
  chemical means.
• Compound
• Element
• Atom
• Mixture

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• Which of the following best describes chicken
  noodle soup?
• Element
• Mixture
• Compound
• Solution

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• Which of the following statements best describes
  elements?
• All of the particles in the same element are
  different.
• Elements can be broken down into simpler
  substances.
• Elements have unique sets of properties.
• Elements cannot be joined together in chemical
  reactions.

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• Hydrogen (chemical symbol H) is a (n)
• Compound
• Mixture
• Element
• Electron

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• Two different atoms are chemically combined to
  form a new substance. What kind of substance
  formed?
• A compound
• An element
• A mixture
• A solute