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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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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.
What is the chemical name for the compound $NaS$?
1. sodium fluoride
2. magnesium sulfide
3. lithium oxide
4. sodium sulfide
Hydrogen Gas is diatomic. It is written as which formula?
1. $H$
2. $He_2$
3. $H_2$
4. $He$
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
Water is an example of
1. element
2. homogeneous mixture
3. compound
4. heterogeneous mixture
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
What are the “bones” of molecules?
1. Cells
2. Nuclei
3. Atoms
4. Femurs
What does an ionic compound usually contain besides a positively charged metal ion?
1. a negatively charged non-metal ion
2. a positively charged non-metal ion
3. a negatively charged metal ion
4. a positively charged metal ion
CO is an element.
1. True
2. False
$CaCO_3$ represents a chemical