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Eighth Grade (Grade 8) Molecules and Compounds Questions

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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
What is the correct formula for aluminum oxide?
  1. AlO
  2. Al3O2
  3. Al2O3
  4. Al3O6
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 of the same compound have different properties.
  4. It can be represented by a chemical formula.
Grade 8 Molecules and Compounds
Define compound.
Grade 8 Molecules and Compounds
In the formula H2SO4, how many atoms are there?
  1. 2
  2. 4
  3. 6
  4. 7
Grade 8 Molecules and Compounds
Table sugar, C12H22O11, has how many atoms? How many elements?
  1. 3, 22
  2. 45, 3
  3. 3, 45
  4. 6, 45
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
Define what a mole of an element is.
Grade 8 Molecules and Compounds
What is the name of the formula scientists use to show the shapes of molecules based on how their atoms are connected?
  1. Chemical Formula
  2. Quadratic Formula
  3. Periodic Formula
  4. Structural Formula
Grade 8 Molecules and Compounds
H2O is a compound.
  1. True
  2. False
Grade 8 Molecules and Compounds
The polarity of water is responsible for which properties?
  1. Cohesion
  2. Adhesion
  3. Surface tension
  4. All of the above
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