Chemistry and Matter

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Chemistry and Matter
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What is chemistry?
The science that deals with the materials of the
universe and the changes that these materials
undergo.
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What is Matter?

• The stuff of which the universe is composed.

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What is Matter?

• Stuff that has mass

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What is Matter?

• Stuff that
• occupies space

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What is Matter?

• Stuff composed
• of tiny particles
• called atoms

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What is air?

• Does it take up space?
• Does it have mass?

Air is composed of different gas molecules
Nitrogen 78 Oxygen 21 Argon 0.9 Carbon
Dioxide 0.03 Neon 0.002 Helium 0.0005
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Matter

• Compounds substances with 2 or more different
  types of atoms bound in a particular way.
• Molecule more than one atom stuck together.
  Can be a compound or an element.
• Examples?

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Elements

• Atoms that are the same form elemental substances
  and sometimes form molecules.
• An element cannot be decomposed into simpler
  substances by physical or chemical means.
• The atoms that make up an element all have the
  same atomic number.

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• Elements contain only atoms of that element and
  never any atoms of any other element.
• However, compounds always contain atoms of
  different elements.
• Remember, molecules can be either elements or
  compounds.

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States of Matter

• 3 states
• Solid
• Liquid
• Gas

Maintains volume and shape regarless of location.
Maintains volume, but changes shape to fit the
shape of its container
Doesnt have a fixed volume or shape. It will
uniformly fill whatever container it is in.
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Figure 2.7 The three states of water Solid.
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Figure 2.7 The three states of water Liquid
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Figure 2.7 The three states of water Gas.
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• http//www.correspondence.school.nz/departments/sc
  ience/chemistry/web/home/chemistry/substances/mixt
  ures.html
• http//www.chem.purdue.edu/gchelp/atoms/elements.h
  tml
• http//www.darvill.clara.net/hotpots/emc.htm
• http//mysite.wanadoo-members.co.uk/science_ICT/ho
  tpots/ks3/elmixcom.html