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You can create printable tests and worksheets from these Grade 8 Molecules and Compounds questions! Select one or more questions using the checkboxes above each question. Then click the add selected questions to a test button before moving to another page.

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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
Select the answer that is a compound.
1. Gold
2. Chicken noodle soup
3. Table salt
Which of the following best describes carbon monoxide?
1. element
2. compound
3. homogeneous mixture
4. heterogeneous mixture
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.
Water is an example of a(n)                      .
1. element
2. homogeneous mixture
3. compound
4. heterogeneous mixture
In the chemical formula $CO_2$, the subscript 2 shows which of the following?
1. There are two oxygen ions.
2. There are two oxygen atoms.
3. There are two $CO_2$ molecules.
4. There are two $CO_2$ compounds.
What is the chemical name for the compound $Na_2S$?
1. sodium fluoride
2. magnesium sulfide
3. lithium oxide
4. sodium sulfide
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.
Which of the following is a compound?
1. dirt
2. silver
3. water
4. blood
In chemistry, the image shown below is called
1. a structural formula.
2. a chemical equation.
3. an empirical formula.
4. an electron-dot diagram.
What are the “bones” of molecules?
1. Cells
2. Nuclei
3. Atoms
4. Femurs
Which of the following is a covalently bonded molecule?
1. $Cl_2$
2. $air$
3. $Ne$
4. $NaCl$