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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 true about compounds?
  1. Compounds are combinations of elements that join specific ratios according to their masses.
  2. The mass ratio of a specific compound is always the same.
  3. Compounds are random combinations of elements.
  4. Different mass ratios mean different compounds.
Grade 8 Molecules and Compounds
CO is an element.
  1. True
  2. False
Grade 8 Molecules and Compounds
Grade 8 Molecules and Compounds
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
Grade 8 Molecules and Compounds
Grade 8 Molecules and Compounds
What two elements is carbon dioxide made of?
  1. carbon and dioxin
  2. carbon and oxygen
  3. carbohydrate and dioxin
  4. carbohydrate and oxide
Grade 8 Molecules and Compounds
Grade 8 Molecules and Compounds
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