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Eighth Grade (Grade 8) Chemistry Questions

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Grade 8 Periodic Table and Elements
Grade 8 Periodic Table and Elements
Which best describes oxygen?
  1. Oxygen is a halogen.
  2. Oxygen is a nonmetal.
  3. Oxygen is a noble gas.
  4. Oxygen is a rare earth element.
Grade 8 Periodic Table and Elements
Grade 8 Periodic Table and Elements
Grade 8 Periodic Table and Elements
Grade 8 Matter
During a change of state, such as melting or freezing, a substance's temperature
  1. increases
  2. decreases
  3. remains constant
  4. increases during melting and decreases during freezing
Grade 8 Acids and Bases
Grade 8 Properties of Matter
Sugar dissolving in water is an example of
  1. chemical change
  2. physical change
Grade 8 Biochemical Pathways
Which of the following statements correctly describes a primary distinction between respiration and photosynthesis?
  1. Photosynthesis needs oxygen, while respiration needs water
  2. Photosynthesis needs carbon dioxide, while respiration needs oxygen and sugars
  3. Photosynthesis makes oxygen, while respiration makes water
  4. Photosynthesis makes water, while respiration makes carbon dioxide
Grade 8 Periodic Table and Elements
Grade 8 Biochemical Pathways
Which chemical process happens in cells releasing energy?
  1. respiration
  2. photosynthesis
  3. breathing
  4. exercise
Grade 8 Periodic Table and Elements
Grade 8 Chemistry
The diagram shows the electron-dot diagram of potassium. What does potassium do with electrons to become stable?
Electron-Dot Diagram - Potassium
  1. It gains 1 valence electron
  2. It gains 2 valence electrons
  3. It loses 1 valence electron
  4. It loses 2 valence electrons
Grade 8 Atomic Structure
Kayla draws the image shown as part of her physical science homework.
Electron-Dot Diagram - Phosphorus
What did Kayla draw?
  1. Bohr model
  2. Lewis symbol
  3. Molecular formula
  4. Structural formula
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