Molecules and Compounds (Grade 8)
Print Test (Only the test content will print)
Molecules and Compounds
What is a molecule?
What is a compound and give an example.
A molecule is the smallest particle of a chemical element that retains its chemical properties.
In a compound, the components are always combined in definite proportions.
The sum of the atomic masses of all of the atoms in a molecule is known as the
- average atomic mass.
- specific mass.
- molar mass.
- molecular mass.
A compound differs from a mixture in that a compound always has a
- homogeneous composition
- maximum of two components
- minimum of three components
- heterogeneous composition
Which of the following is NOT a characteristic of a compound?
- has different properties from the element that formed it.
- pure substances made of two or more elements.
- different samples have different properties.
- can be represented by a chemical formula
A compound that conducts electricity when melted or dissolved in water is a(an) .
Select the answer that is a compound.
- Chicken noodle soup
- Table salt
- Rocky road ice cream
Of the following, is NOT a compound.
- sodium chloride
- epsom salt