What is Chemistry

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What is Chemistry?
Lets Find Out!
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What do you think of when you hear CHEMISTRY?
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Chemistry is all around us!

• Food
• Photography
• Fisherman
• Medicines
• Textiles
• Playgrounds

A CHEMICAL IS ANY SUBSTANCE WITH A DEFINITE
COMPOSITION!
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Background Info!

• All matter is made of particles.
• A basic property of matter is its PHYSICAL STATE!
• These physical states are solid, liquid, and
  gas!

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What defines these states of matter?

• SOLIDSfixed volume and shape
• (Particles are held tightly and vibrate very
  little)
• LIQUIDSfixed volume, but variable shape
• (Particles can flow and take the shape of the
  container, but have a definite volume)
• GASESno fixed shape or volume
• (Particles move freely and expand to fill any
  container they occupy)

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Classification of Matter

• We can classify matter into one of three states,
  but this is very general!
• We also classify matter into one of four
  categories element, compound, mixture, or
  solution.
• Lets see how to do this!

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ELEMENTS

• An element is a substance that cant be broken
  down into simpler chemical substances.
• There are 90 naturally occurring elements on
  earth and many synthetic elements as well.
• EX Gold, Carbon, Lead

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COMPOUNDS

• A compound is a substance that is composed of
  atoms of two or more different elements that are
  chemically combined.
• EX Water is a combination of oxygen atoms and
  hydrogen atoms.

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MIXTURES

• A mixture is a combination of substances in which
  individual components retain their individual
  properties.
• So the two substances are not chemically
  combined!
• EX Sand and sugar mixture you can still pick
  out the sand particles and the sugar grains.
  They do NOT make a new substance.

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SOLUTIONS

• A solution is a mixture in which one or more
  substances are distributed evenly in another
  substance.
• One substance is dissolved in another!
• EX Kool-Aid! The Kool-aid crystals dissolve in
  water making a tasty treat!

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Use your brain!

• Matter can be homogenous or heterogeneous!
• What do those words mean?
• Remember your roots!

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Did you figure it out?

• If something is HOMOGENOUS, that means it is the
  SAME throughout!
• If something is HETEROGENEOUS, that means there
  are different parts to it!

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This is just the beginning of our journey into
the world of CHEMISTRY!