Representing Matter<br />The fundamental unit of matter is the atom.<br />Greek-”unbreakable”<br />A neutral group of atom...
Matter cont.<br />Elements are the simplest pure substances. <br />Contain only one kind of atom.<br />Each has their own ...
Matter cont.<br />If a molecule has at least two different kinds of atoms present then it is a compound<br />
Classifying Matter<br />Use the symbols of the elements<br />Ag, Na, H2, NaCl, H2O, etc<br />Subscripts tell how many of a...
Pure Substances<br />Fixed composition<br />Cannot be separated into simpler substances by physical methods (physical chan...
Mixtures<br />Variable composition<br />Components retain their characteristic properties<br />May be separated into pure ...
Homogeneous Mixtures<br />Homogenous mixtures look the same throughout but can be separated by physical means (dissolution...
Heterogeneous Mixtures<br />Heterogeneous mixtures are composed of large pieces that are easily separated by physical mean...
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Representing matter

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Representing matter

  1. 1. Representing Matter<br />The fundamental unit of matter is the atom.<br />Greek-”unbreakable”<br />A neutral group of atoms held together by chemical bonds is called a molecule<br />
  2. 2. Matter cont.<br />Elements are the simplest pure substances. <br />Contain only one kind of atom.<br />Each has their own set of physical and chemical properties<br />Diatomic<br />
  3. 3. Matter cont.<br />If a molecule has at least two different kinds of atoms present then it is a compound<br />
  4. 4. Classifying Matter<br />Use the symbols of the elements<br />Ag, Na, H2, NaCl, H2O, etc<br />Subscripts tell how many of an atom is in the molecule<br />H2O, H2SO4, CaCl2<br />Coefficientstell how many of the atom/molecule<br />Ag, 2Na, 3H2, 4NaCl, 5H2O, etc<br />
  5. 5. Pure Substances<br />Fixed composition<br />Cannot be separated into simpler substances by physical methods (physical changes)<br />Can only be changed in identity and properties by chemical methods<br />Properties do not vary<br />
  6. 6. Mixtures<br />Variable composition<br />Components retain their characteristic properties<br />May be separated into pure substances by physical methods<br />Mixtures of different compositions may have widely different properties<br />
  7. 7. Homogeneous Mixtures<br />Homogenous mixtures look the same throughout but can be separated by physical means (dissolution, centrifuge, gravimetric filtering, etc.). Examples: milk, yogurt, solutions<br />
  8. 8. Heterogeneous Mixtures<br />Heterogeneous mixtures are composed of large pieces that are easily separated by physical means (ie. density, polarity, metallic properties). <br />

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