7th Grade

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7th Grade Unit 11 Chemical Reactions and
Compounds Lesson 1 Physical Properties of
Elements Vocabulary of Instruction
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1. Brittle

• Having little elasticity hence easily cracked,
  fractured, or snapped.

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2. Conductivity

• Property of metals and alloys that allows heat or
  electrical charges to pass through the material
  easily.

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3. Ductile

• Ability of metals to be drawn into wires.

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4. Luster

• Property of metals and alloys that describes
  having a shiny appearance or reflecting light.

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5. Magnetic

• The properties and interactions of magnets to
  attract other metal objects.

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6. Malleable

• Ability of metals and alloys to be rolled or
  hammered into thin sheets.

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7. Metal

• Element that typically is a hard, shiny solid, is
  malleable, and is a good conductor of heat and
  electricity.

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8. Metalloid

• Element that shares some properties with metals
  and some with nonmetals.

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9. Nonmetal

• Element that usually is a gas or brittle solid at
  room temperature, is not malleable or ductile, is
  a poor conductor of heat and electricity, and
  typically is not shiny.

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10. Reactive

• A chemical that, in the pure state, or as
  produced or transported, will vigorously
  polymerize, decompose, condense, or become
  self-reactive under conditions of shock, high
  pressure, or high temperature.

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11. Semiconductor

• Materials having conductivity properties between
  that of metals (good conductors) and nonmetals
  (insulators) and having controllable conductivity
  parameters.

Germanium
Silicon
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12. Sonorous

• Capable of giving out a deep, resonant sound.