Topic: Chemistry

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• Topic Chemistry
• Aim Describe the difference between elements and
  compounds.
• Do Now Bottom of Atoms reading notes
• HW Ditto - Measuring Mass and Volume Part A
• (Properties Reading Notes due tomorrow)

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• Lets review
• Identify the building blocks of matter.
• Identify the subatomic particles that make up an
  atom.
• Describe the location of each subatomic particle.
• Describe the charge of each subatomic particle.
• What is an atoms atomic number indicate?

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Oxygen atom

-
4
Oxygen atom
Nucleus
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-


-

-

Neutron



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Proton
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Electron
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Elements

• Made up of only ONE type of atom
• CANNOT be broken down

7
26
29
79
8
47
28
6
17
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Compounds

1. How many atoms are found in each compound?
2. How many elements are found in each compound?
3. How are the atoms connected to each other?

3 atoms
4 atoms
2 elements
2 elements
3 atoms
5 atoms
2 elements
2 elements
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Compounds

• Made up of 2 or more different elements
  CHEMICALLY combined
• Can be broken down

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Compounds have properties DIFFERENT from the
properties of the elements that it is made up of.

• Compounds have properties DIFFERENT from the
  elements it is made up of

Na
Cl
NaCl
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• Molecule
• Formed when 2 or more ATOMS join together
  chemically
• All compounds are molecules

Water is a compound because it is made up of the
elements H and O.
This is one molecule of water because H and O are
bonded together.
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• When atoms of the same element join together we
  get a molecule of that element.

Oxygen (O2)
Hydrogen (H2)
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• Compounds will always exist as molecules, not
  separate atoms.

3 water (H2O) molecules
2 carbon dioxide (CO2) molecules
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• Ex A glass of water is made up of millions of
  water molecules that are exactly the same

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Thousands of molecules of Sodium chloride
1 molecule of Sodium chloride
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• Lets summarize
• Describe an element.
• Describe a compound.
• Describe the difference between an element and a
  compound.
• Are all compounds molecules? Support your answer.
  
• Identify a molecule that is not a compound.

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• Review
• An object has a mass of 10g and a volume of 2cm3.
  Identify the density of the object.
• D M/V
• 10g/2cm3
• 5g/cm3

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• Identify the instrument used to measure mass.
• Thermometer
• Graduated cylinder
• Triple beam balance
• Metric ruler

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• The SI units used when measuring mass are
• milliliters
• centimeters cubed
• meters
• grams

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• Identify the instrument used to measure
  temperature.
• Thermometer
• Graduated cylinder
• Triple beam balance
• Metric ruler

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• Identify the SI units used to measure
  temperature.
• meter
• degrees Celsius
• grams
• Degrees Fahrenheit

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• Identify the SI units used to measure the density
  of a liquid.
• mL
• g/cm3
• cm3
• g/mL