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Molecules and Compounds (Grade 8)

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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.
  1. True
  2. False
In a compound, the components are always combined in definite proportions.
  1. True
  2. False
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.
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
Which of the following is NOT a characteristic of a compound?
  1. has different properties from the element that formed it
  2. pure substances made of two or more elements
  3. different samples have different properties
  4. can be represented by a chemical formula
A compound that conducts electricity when melted or dissolved in water is a(an)               .
  1. electrolyte
  2. electron
  3. molecule
  4. hydrocarbon
Select the answer that is a compound.
  1. Gold
  2. Chicken noodle soup
  3. Table salt
  4. Rocky road ice cream
Of the following,                is NOT a compound.
  1. water
  2. oxygen
  3. sodium chloride
  4. epsom salt
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