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Eighth Grade (Grade 8) Bonds and Mixing Questions

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Grade 8 Bonds and Mixing
Grade 8 Bonds and Mixing
Compare and contrast mixtures and compounds. Which statement is true about mixtures and compounds?
  1. Mixtures and compounds are the same throughout.
  2. Mixtures and compounds are made of two or more elements in a definite proportion.
  3. Mixtures must be separated by chemical methods and compounds by physical methods.
  4. Mixtures contain two or more elements physically combined and compounds contain two or more elements chemically combined.
Grade 8 Bonds and Mixing
Grade 8 Bonds and Mixing
A chemical bond is
  1. a group of atoms that are joined together.
  2. the basic particle of matter.
  3. the force that holds two atoms together.
  4. a substance formed from the chemical combination of two or more atoms.
Grade 8 Bonds and Mixing
What holds sodium chloride crystals together?
  1. covalent bonds
  2. ionic bonds
  3. a sea of electrons
  4. metallic bonds
Grade 8 Bonds and Mixing
Grade 8 Bonds and Mixing
Grade 8 Bonds and Mixing
What is the definition of a solvent?
  1. The substance that is dissolved.
  2. The substance in which the solute is dissolved.
  3. Unable to be dissolved.
Grade 8 Bonds and Mixing
Grade 8 Bonds and Mixing
What joins 2 atoms together in a covalent bond?
  1. protons
  2. nuclei
  3. neutrons
  4. electrons
Grade 8 Bonds and Mixing
In general, covalent bonds
  1. always form polar bonds.
  2. are good conductors of electricity when dissolved in water.
  3. consist of atoms that share electrons.
  4. have high melting points.
Grade 8 Bonds and Mixing
Grade 8 Bonds and Mixing
Grade 8 Bonds and Mixing
Which mixture has the largest particle size?
  1. Solution
  2. Colloid
  3. Mixture
  4. Suspension
Grade 8 Bonds and Mixing
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