Atoms and Molecules

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Atoms and Molecules

• Basic units of EVERYTHING!

Of all the PowerPoints, this one matters the
most - PPTA
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Which of these is true?

1. Atom and molecule mean the same thing.
2. Atoms are made of molecules.
3. Molecules are made of atoms.

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What is the smallest structure in this list that
can be seen with an ordinary desk microscope?

1. Cells.
2. Cell nucleus.
3. Atoms.
4. Chain molecules, such as proteins.

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The Structure of Matter

• Matter Anything that has mass and takes up space

Mass The amount of matter in an object
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Atoms smallest unit of matter that has the
properties of an element.
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In our model of scale, remember that the BB
represented an atom.
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Hydrogen
Helium
As a class, identify the atoms represented here
and label the sub-atomic particles.
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• Element a type of atom

Oxygen
Carbon
Phosphorous
Calcium
What elements are represented here? Use the
Periodic Table on the wall to identify these
atoms.
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Why is this important?

• Each element has distinct properties color,
  melting point, reactivity, etc.
• The basic atomic structure of each element
  determines that elements properties. Change the
  structure, and you have an entirely different
  element.

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Each element has a name and symbol
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Not all elements are equally common
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Molecules
Atoms combine to form molecules.
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States of Matter

• State Definite Shape Definite Volume
• Solid
• Liquid
• Gas

Yes
Yes
Yes
No
No
No
Solid Liquid Gas
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Which of these is found in the nucleus of an atom?

1. Protons
2. Electrons
3. DNA
4. Depends on the atom

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An ion is an atom that has lost or gained

1. An electron
2. A proton
3. A neutron
4. Any sub-atomic particle

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T or F An atomic nucleus and a cell nucleus are
about the same size.

1. True
2. False
3. Depends on which cell and which atom.

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