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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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Hydrogen Gas is diatomic. It is written as which formula?
1. $H$
2. $He_2$
3. $H_2$
4. $He$
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 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
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
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 substance made of two or more elements
3. It keeps the properties of the elements that make it up
4. It can be represented by a chemical formula
Water is an example of
1. element
2. homogeneous mixture
3. compound
4. heterogeneous mixture
What are the “bones” of molecules?
1. Cells
2. Nuclei
3. Atoms
4. Femurs
CO is an element.
1. True
2. False
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 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
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