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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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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
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. $NaCl$
What is the word to describe oil repelling or pushing away from water?
1. Hydrophobic
2. Agoraphobic
3. Waterphobic
4. Claustrophobic
Which of the following is NOT a characteristic of a compound?
1. It has different properties from the elements that formed it.
2. It is a pure substance made of two or more elements.
3. Different samples of the same compound have different properties.
4. It can be represented by a chemical formula.
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
$CaCO_3$ represents a chemical