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Eighth Grade (Grade 8) Chemistry Questions

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Grade 8 Molecules and Compounds
Select the answer that is a compound.
  1. Gold
  2. Chicken noodle soup
  3. Table salt
  4. Rocky road ice cream
Grade 8 Matter
Select all of the following that qualify as physical changes.
  1. burning
  2. bending
  3. breaking
  4. dissolving
  5. crushing
  6. evaporating
  7. melting
  8. decaying
Grade 8 Macromolecules
Which type of chemicals help to digest food?
  1. minerals
  2. enzymes
  3. cells
  4. lipids
Grade 8 Bonds and Mixing
What is a chemical bond?
  1. a group of atoms that are joined together
  2. the basic particle of matter
  3. the force that holds two atoms together
  4. a substance formed from the chemical combination of two or more atoms
Grade 8 Atomic Structure
The mass of a neutron is
  1. about equal to the mass of a proton.
  2. much less than the mass of a proton.
  3. about equal to the mass of an electron.
  4. much less than the mass of an electron.
Grade 8 Biochemical Pathways
Grade 8 Properties of Matter
A geologist finds a rock and breaks it into two pieces to examine the crystals inside. The two pieces of the rock are then labeled Sample A and Sample B. Sample A is twice as large as Sample B. Which of the following statements is true?
  1. Sample A is denser than Sample B.
  2. Sample B is denser than Sample A.
  3. Sample A and Sample B have the same density.
  4. Sample A and Sample B are both less dense than the original rock.
Grade 8 Bonds and Mixing
Which of the following best classifies dirt?
  1. element
  2. compound
  3. homogeneous mixture
  4. heterogeneous mixture
Grade 8 Biochemical Pathways
Which of the following is TRUE statement about cellular respiration?
  1. Cellular respiration converts energy directly from the Sun into energy stored in chemical bonds.
  2. Cellular respiration cannot occur without sunlight.
  3. Cellular respiration occurs in plant cells and in animal cells.
  4. Cellular respiration is not a cycle with photosynthesis.
Grade 8 Matter
Select all of the following that qualify as chemical properties.
  1. Reactivity with water
  2. pH
  3. Flammability
  4. Rusting
  5. Creating gases
  6. Texture
  7. Color
  8. Creating a new chemical product
Grade 8 Matter
Which is true regarding the solid model?
  1. There are strong forces of attraction between the particles.
  2. The particles move around freely.
  3. There are great open spaces between the particles.
  4. The particles move great distances before they collide.
Grade 8 Acids and Bases
Grade 8 Properties of Matter
Grade 8 Properties of Matter
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