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Eighth Grade (Grade 8) Molecules and Compounds Questions

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Grade 8 Molecules and Compounds
Grade 8 Molecules and Compounds
A compound differs from a mixture in that a compound always has a                            .
  1. homogeneous composition
  2. maximum of two components
  3. minimum of three components
  4. heterogeneous composition
Grade 8 Molecules and Compounds
Select the answer that is a compound.
  1. Gold
  2. Chicken noodle soup
  3. Table salt
  4. Rocky road ice cream
Grade 8 Molecules and Compounds
Which of the following best describes carbon monoxide?
  1. element
  2. compound
  3. homogeneous mixture
  4. heterogeneous mixture
Grade 8 Molecules and Compounds
How is a molecule different from an atom?
  1. A molecule has 2 or more atoms bonded together.
  2. A molecule is a group of the same kind of atoms.
  3. An atom is not at all related to a molecule.
  4. A molecule is smaller than an atom.
Grade 8 Molecules and Compounds
Water is an example of a(n)                      .
  1. element
  2. homogeneous mixture
  3. compound
  4. heterogeneous mixture
Grade 8 Molecules and Compounds
In the chemical formula [math]CO_2[/math], the subscript 2 shows which of the following?
  1. There are two oxygen ions.
  2. There are two oxygen atoms.
  3. There are two [math]CO_2[/math] molecules.
  4. There are two [math]CO_2[/math] compounds.
Grade 8 Molecules and Compounds
What is the chemical name for the compound [math]Na_2S[/math]?
  1. sodium fluoride
  2. magnesium sulfide
  3. lithium oxide
  4. sodium sulfide
Grade 8 Molecules and Compounds
The sum of the atomic masses of all of the atoms in a molecule is known as the
  1. average atomic mass.
  2. specific mass.
  3. molar mass.
  4. molecular mass.
Grade 8 Molecules and Compounds
Which of the following is a compound?
  1. dirt
  2. silver
  3. water
  4. blood
Grade 8 Molecules and Compounds
Grade 8 Molecules and Compounds
Grade 8 Molecules and Compounds
In chemistry, the image shown below is called
Structural Formula - Aldehyde
  1. a structural formula.
  2. a chemical equation.
  3. an empirical formula.
  4. an electron-dot diagram.
Grade 8 Molecules and Compounds
What are the “bones” of molecules?
  1. Cells
  2. Nuclei
  3. Atoms
  4. Femurs
Grade 8 Molecules and Compounds
Which of the following is a covalently bonded molecule?
  1. [math]Cl_2 [/math]
  2. [math]air[/math]
  3. [math]Ne[/math]
  4. [math]NaCl[/math]
Grade 8 Molecules and Compounds
Grade 8 Molecules and Compounds
What is the word to describe oil repelling or pushing away from water?
  1. Hydrophobic
  2. Agoraphobic
  3. Waterphobic
  4. Claustrophobic
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