Week 9 CCA Test Review

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Week 9 CCA Test Review

• Chemistry Atoms and the Periodic Table

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Labeling an atom
Electron
Neutron
Proton
Nucleus
Energy Level
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Fill in the table
Subatomic Particles Charge
Proton
Negative
Neutron
Positive
Electron
Neutral/ No charge
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What is the atomic mass?
Atomic mass the weight of an atom
Protons Neutrons Atomic Mass
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What is the atomic number?

• Atomic number Element number used to show where
  on the periodic table the element is found. Also,
  it is the number of protons.

Atomic Number Number of Protons
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What are valence electrons?

• Electrons in the outside shell (energy level) of
  an atom. They are used to determine how reactive
  the atom is.

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How can you find the number of neutrons?

• Atomic Mass
• Atomic Number (protons)
• Neutrons

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How do you know if an atom is neutral?

• If it has the same number of positive (protons)
  and negative (electron) charges

Remember all elements on the periodic table are
neutral!
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Fill in the missing information
Atomic Mass 9
Atomic Number
Protons 4
Neutrons
Electrons 4
Energy Levels?
Valence Electrons
Is this a stable atom?
Is this a neutral atom?
Element?
Element symbol?
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2-8-8 Rule Octet Rule
9 - 4 5
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2
No - Valence level is not full
Yes protons electrons
Beryllium
Be
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Bohr Model
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How is the Periodic Table arranged?

• By atomic number (number of protons)
• Groups (valence electrons) and Period (energy
  levels)
• Physical and Chemical properties

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Color Metals, Non-Metals, and Metalloids
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Label Groups and Periods
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Most reactive groups
Group 1
Group 17
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Least Reactive Group
Noble Gasses Group 18
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What information can be found if you know the
Period of an element?

• Number of energy levels

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What information can be found if you know the
group of an element?

• Number of valence electrons

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Most reactive groups
Group 1
Why? Group 1 only has one valence electron and
group 17 only has 7. They are both 1 valence
electron away from being stable (happy).
Group 17
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Least Reactive Group
Why? Group 18 has 8 valence electrons which fills
up the valence level, meaning the atom is stable
(happy)
Noble Gasses Group 18
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Why do elements with similar valence level of
electrons have similar chemical properties?

• They will react the same way, because they have
  the same number of valence electrons

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What has similar physical and chemical
characteristics to Nitrogen?

• Any element that is in the same family/group

Nitrogen Family
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Argon - Protons

• Remember Atomic number protons
• Protons 18

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Sodium Atomic Mass

• Atomic Mass 22
• (drop the decimals)

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Carbon - neutrons

• Remember Atomic mass atomic number neutrons
• Neutrons 6

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Neon atomic number

• Atomic Number 10

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Potassium Valence Electrons
1st group 1 valence electron

• Valence electrons - 1

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Potassium Valence Electrons
2nd Period 2 energy levels

• Energy Levels Used - 2

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Oxygen Bohr Model
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Review from Unit 1

• Physics

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• Independent Variable What I (experimenter)
  change from trial to trial
• Dependent Variable the outcome or results

DRY
MIX
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Work

• Force x Distance Work
• Examples???

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Newtons 3 Laws

1. An object at rest will stay at rest, and an
   object in motion will stay in motion unless acted
   upon by an outside force
2. Fma
3. For every action there is an equal and opposite
   reaction

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Balanced and Unbalanced Forces

• Balanced not moving
• Unbalanced moving (creates a net force)

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Equations

• Speed D/T
• Acceleration change in speed/change in time
• Force ma
• Work Force x distance

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Make sure you look over how to do a lab write up
(steps for experimental design)