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Eighth Grade (Grade 8) Bonds and Mixing Questions

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Grade 8 Bonds and Mixing
Which term describes the units that make up compounds with covalent bonds?
  1. ions
  2. molecules
  3. salts
  4. acids
Grade 8 Bonds and Mixing
When a solid compound dissolves in water
  1. it breaks up into individual crystals.
  2. it always conducts electricity.
  3. its particles surround individual water molecules.
  4. each of its particles becomes surrounded by water molecules.
Grade 8 Bonds and Mixing
Which of the following are both best classified as heterogeneous mixtures?
  1. salad and dirt
  2. dirt and air
  3. water and air
  4. air and salad
Grade 8 Bonds and Mixing
Ionic bonds involve the sharing of protons.
  1. True
  2. False
Grade 8 Bonds and Mixing
Which of the following are both best classified as homogeneous mixtures?
  1. dirt and water
  2. water and blood
  3. saltwater and dirt
  4. blood and saltwater
Grade 8 Bonds and Mixing
Lemonade without pulp is a heterogeneous mixture.
  1. True
  2. False
Grade 8 Bonds and Mixing
What happens to the electrons in the formation of a polar covalent bond?
  1. They are lost.
  2. They are gained.
  3. They are shared equally.
  4. They are shared unequally.
Grade 8 Bonds and Mixing
A(n)                 forms when atoms share one or more pairs of electrons.
  1. metallic bond
  2. molecule
  3. covalent bond
  4. ionic bond
  5. ion
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