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Eighth Grade (Grade 8) Molecules and Compounds Questions

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Grade 8 Molecules and Compounds
CaCO3 represents a chemical                .
  1. symbol
  2. subscript
  3. formula
  4. reaction
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
In chemistry, the image shown below is called a/an                     .
Structural Formula - Aldehyde
  1. structural formula
  2. chemical equation
  3. empirical formula
  4. electron-dot diagram
Grade 8 Molecules and Compounds
How many atoms are represented in the formula CaCO3?
  1. 3
  2. 4
  3. 5
  4. 6
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
Name the compound: KI
  1. Potassium iodide
  2. Potassium monoiodide
  3. Potassium iodine
  4. Monopotassium monoiodide
Grade 8 Molecules and Compounds
In the chemical formula CO2, the subscript 2 shows which of the following?
  1. There are two oxygen ions.
  2. There are two oxygen atoms.
  3. There are two CO2 molecules.
  4. There are two CO2 compounds.
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
What is the chemical name for the compound Na2S?
  1. sodium fluoride
  2. magnesium sulfide
  3. lithium oxide
  4. sodium sulfide
Grade 8 Molecules and Compounds
Chemical compounds can be found on the Periodic Table.
  1. True
  2. False
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
Sodium Chloride (NaCl) is an example of                 .
  1. a solid
  2. a compound
  3. a crystal
  4. all of the above
Grade 8 Molecules and Compounds
Which of the following is a covalently bonded molecule?
  1. Cl2
  2. air
  3. Ne
  4. NaCl
Grade 8 Molecules and Compounds
What are the “bones” of molecules?
  1. Cells
  2. Nuclei
  3. Atoms
  4. Femurs
Grade 8 Molecules and Compounds
A gas which is so heavy that it can be "poured" is                .
  1. hydrogen
  2. oxygen
  3. carbon dioxide
  4. water vapor
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