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Eighth Grade (Grade 8) Bonds and Mixing Questions

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Grade 8 Bonds and Mixing
What are the two major categories of matter?
  1. Atoms and molecules
  2. Homogeneous and heterogeneous mixtures
  3. Mixtures and substances
  4. Elements and compounds
Grade 8 Bonds and Mixing
[math]MgF_2[/math] is an example of a(n)                .
  1. ionic bond
  2. metallic bond
  3. covalent bond
  4. noble bond
Grade 8 Bonds and Mixing
How is a mixture different from a compound?
  1. A mixture has a chemical formula. A compound does not.
  2. Substances in a compound are chemically combined. The substances in a mixture are not.
  3. A compound is easier to separate than a mixture.
  4. A mixture forms with a chemical reaction. A compound does not.
Grade 8 Bonds and Mixing
Grade 8 Bonds and Mixing
Which of the following best classifies dirt?
  1. element
  2. compound
  3. homogeneous mixture
  4. heterogeneous mixture
Grade 8 Bonds and Mixing
What is a chemical bond?
  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
Which substance dissolves another?
  1. solute
  2. solvent
  3. mixture
  4. compound
Grade 8 Bonds and Mixing
Grade 8 Bonds and Mixing
An ionic bond is the attraction between                        .
  1. similarly charged ions
  2. oppositely charged ions
  3. neutral ions
  4. neutral atoms
Grade 8 Bonds and Mixing
Grade 8 Bonds and Mixing
Grade 8 Bonds and Mixing
All methods used to separate a mixture are based on the substances'
  1. chemical properties.
  2. physical properties.
  3. electric properties.
  4. nuclear properties.
Grade 8 Bonds and Mixing
Grade 8 Bonds and Mixing
Elements and compounds that have fixed compositions can be called
  1. mixtures.
  2. substances.
  3. alloys.
  4. aqueous solutions.
Grade 8 Bonds and Mixing
Electrons involved in bonding between atoms are                       .
  1. valence electrons
  2. inside the nucleus
  3. closest to the nucleus
  4. positively charged
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