Physical

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Physical Chemical Properties / Compounds
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1 Mendeleevs task
When this guy
created this thing
he used knowledge of the properties of the
elements to arrange them. Properties of elements
come in two varieties physical and chemical
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2 Physical Properties
Physical Properties can be observed/measured
without changing the substance

• Color Texture

• State of Matter (boiling, melting, etc.)

• Density

• Conductivity

• Malleability (form into shapes)

• Ductility (stretch into wires)

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3 Chemical Properties
Chemical Properties only observed when the
substance reacts and changes into a new substance

• Color change

• Reaction with chemicals (ex flammability)

• Formation of gases

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4 Review
Physical Properties can be observed without
changing the substance.
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5 Properties of the PT Families
We spent some time color-coding our Periodic
Table. Lets explore this further.
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6 Properties of Metals

• Common State strong, shiny solids
• Conductor good
• Malleable mostly yes
• Ductile mostly yes

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7 Properties of Nonmetals

• Common State gases or weak, dull solids
• Conductor poor (good insulators)
• Malleable no
• Ductile no

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8 Properties of Metalloids
Dont think of metalloids as a blend of Metals
nonmetals. Instead, think of them as sometimes
being metallic and being nonmetallic in other
conditions.

• Common State brittle solids, some shiny
• Conductor semi-conductors (useful!)
• Malleable no
• Ductile no

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9 New Topic Compounds
Remember our discussion of what makes an element
an element? (theyre a substance made of just one
kind of atom). Remember why we said that water
and steel and plastic ARENT on the P. Table?
(theyre made FROM elements combined).
So what do we call substances like water and
plastic that are made when pure elements combine
chemically? COMPOUNDS! Compound a new
substance formed when two or more
elements chemically combine
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10 The 1 Thing to Remember
When elements combine to form compounds, the
compound usually has VERY different properties
from the elements themselves.
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11 More examples of compounds
Iron (metal) Oxygen (gas) ? rust (crumbly
solid)
Nitrogen (gas) Hydrogen (gas) ? Ammonia
(odorous liquid)
Carbon (dull solid) Hydrogen (gas) ?
Naphthalene (moth balls)
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THE END