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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
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
Grade 8 Bonds and Mixing
Which substance dissolves another?
  1. solute
  2. solvent
  3. mixture
  4. compound
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
Which of the following best classifies dirt?
  1. element
  2. compound
  3. homogeneous mixture
  4. heterogeneous mixture
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
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
Select the answer below that is true about mixtures and compounds.
  1. Mixtures are formed when substances physically combine while compounds are formed when they are chemically combined.
  2. In mixtures the substances keep their properties, but in compounds the substances combined can lose their properties and become a new substance.
  3. Compounds require a chemical reaction to separate their parts, but a mixture can be physically separated.
  4. All of the above
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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