science glossary terms

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Author:
alexisboudreau
ID:
185146
Filename:
science glossary terms
Updated:
2012-12-09 14:21:59
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chapter science glossary terms
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MS DAY chapter 6 glossary terms grade 9
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  1. Ion
    An ion is a positively or negatively charged atom or group of atoms
  2. Chemical bond
    chemical bonds are the links that hold atoms together
  3. Ionic bond
    • compounds that consist of 2 or more elements that are chemically linked together.
    • ionic bond : a chemical bond that forms between oppositely charged ions.
  4. Ionic compound
    A compound that forms when one or more valence electrons is transferred from one atom to another.

    An ionic bond forms between 2 ions, forming a neutral compound.

    • Ionic compounds tend to be very strong requiring large amounts of energy to break.
    •  
    • most ionic compounds exist in a solid arrangement called crystal lattice (regular repeating pattern of ions)

    many ionic compounds are soluble in water

    good conductors of electricity when melted or dissolved in water.
  5. Covalent bond
    • A chemical bond in which two atoms share one or more pairs of electrons
  6. Molecule
    • A molecule is the smallest unit of a pure substance that has two or more atoms covalently bonded.
    • Not all molecules are compounds because compounds are made up or 2 or more different elements
    • Ex. oxygen is a molecule but not a compound.
  7. Molecular compound
    • (ex. H2O)
    • A compound with particles made up of atoms held together by covalent bonds

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