Ch 2 part 1
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Ch. 2 Part 1. Chemical Level of Organization. Chemistry Review. You should already know this! If you don’t, make notes. What are: atoms nucleus p rotons neutrons electrons energy levels a tomic number mass numbermolecule c ompound cation anion

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Ch. 2 Part 1

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Ch 2 part 1

Ch. 2Part 1

Chemical Level of Organization


Chemistry review

Chemistry Review

  • You should already know this!If you don’t, make notes.

  • What are:

    atoms nucleusprotons

    neutrons electronsenergy levels

    atomic number mass numbermolecule

    compoundcationanion

    ionic bond covalent bondchemical reaction

    reactants products


Atoms

Atoms

  • Atoms – smallest units of matter

  • Have a nucleus – center

    • Protons – positive, live in nucleus

    • Neutrons – neutral, live in nucleus

    • Electrons – negative, live in energy levels


Periodic table

Periodic Table


Periodic table1

Periodic Table

  • Atomic number – big number on periodic table, tells the number of protons

  • Mass number – small number on periodic table, tells the number of protons + neutrons

  • IN A NEUTRAL ATOM – the number of protons = the number of electrons

  • Practice

    • Neon, gallium, zirconium, chlorine


Compounds vs molecules

Compounds vs. Molecules

  • Compound – contains 2 or more different elements

    • Examples – H2O, NaCl, MgCl2

  • Molecules – contains 2 or more atoms that share electrons

    • Examples, H2O, O2


Bonding

Bonding

  • 2 Types – ionic and covalent

  • Ionic bonds – occur between ions, atoms give/take electrons

  • Covalent bonds – occur between atoms, atoms share electrons


Ionic bonds

Ionic Bonds

  • Ions give or take electrons

  • Cations - + ions

  • Anions – ions

  • When put together properly, compound should be neutral

  • Practice: sodium and chlorine

    • Na is a cation (Na+), chlorine is an anion (Cl-)

    • NaCl


Covalent bonds

Covalent Bonds

  • Atoms share electrons

  • Must meet the octet rule – each atom must have 8 electrons

  • Use Lewis structures for help

  • We will not worry about bonding angles or shape


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