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Eighth Grade (Grade 8) Molecules and Compounds Questions

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Grade 8 Molecules and Compounds
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.
Grade 8 Molecules and Compounds
Hydrogen Gas is diatomic. It is written as which formula?
  1. [math]H[/math]
  2. [math]He_2[/math]
  3. [math]H_2[/math]
  4. [math]He[/math]
Grade 8 Molecules and Compounds
What is the chemical name for the compound [math]NaS[/math]?
  1. sodium fluoride
  2. magnesium sulfide
  3. lithium oxide
  4. sodium sulfide
Grade 8 Molecules and Compounds
In chemistry, the image shown below is called
Structural Formula - Aldehyde
  1. a structural formula
  2. a chemical equation
  3. an empirical formula
  4. an electron-dot diagram
Grade 8 Molecules and Compounds
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
Grade 8 Molecules and Compounds
Water is an example of
  1. element
  2. homogeneous mixture
  3. compound
  4. heterogeneous mixture
Grade 8 Molecules and Compounds
Grade 8 Molecules and Compounds
Grade 8 Molecules and Compounds
What are the “bones” of molecules?
  1. Cells
  2. Nuclei
  3. Atoms
  4. Femurs
Grade 8 Molecules and Compounds
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
Grade 8 Molecules and Compounds
CO is an element.
  1. True
  2. False
Grade 8 Molecules and Compounds
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
Grade 8 Molecules and Compounds
Grade 8 Molecules and Compounds
Grade 8 Molecules and Compounds
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
Grade 8 Molecules and Compounds
What is the word to describe oil repelling or pushing away from water?
  1. Hydrophobic
  2. Agoraphobic
  3. Waterphobic
  4. Claustrophobic
Grade 8 Molecules and Compounds
Sodium Chloride (NaCl) is an example of
  1. a solid
  2. a compound
  3. a crystal
  4. all of the above
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