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Eighth Grade (Grade 8) Chemistry Questions

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Grade 8 Biochemical Pathways
Which chemical process happens in cells to release energy?
  1. respiration
  2. photosynthesis
  3. breathing
  4. exercise
Grade 8 Periodic Table and Elements
Which element has 4 neutrons?
  1. an element with an atomic number of 2 and an atomic mass of 4
  2. an element with an atomic number of 3 and an atomic mass of 7
  3. an element with an atomic number of 4 and an atomic mass of 9
  4. an element with an atomic number of 7 and an atomic mass of 14
Grade 8 Biochemical Pathways
What are the reactants of cellular respiration?
  1. water (H2O) and glucose (C6H12O6)
  2. glucose (C6H12O6) and carbon dioxide (CO2)
  3. carbon dioxide (CO2) and water (H2O)
  4. glucose (C6H12O6) and oxygen (O2)
Grade 8 Bonds and Mixing
Sand is dropped into a beaker of iron filings. This is an example of a(n)
  1. electrolysis.
  2. element.
  3. mixture.
  4. compound.
Grade 8 Biochemical Pathways
Which statement 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
The modern Periodic Table is organized by                .
  1. atomic number
  2. atomic mass
  3. chemical symbol
Grade 8 Periodic Table and Elements
Mercury is a metalloid.
  1. True
  2. False
Grade 8 Organic Chemistry
The four classes of organic chemistry required by living things are                                                     .
  1. carbohydrates, proteins, vitamins, and lipids
  2. carbohydrates, proteins, nucleic acids, and vitamins
  3. carbohydrates, proteins, nucleic acids, and lipids
  4. carbohydrates, vitamins, nucleic acids, and lipids
Grade 8 Periodic Table and Elements
Cobalt has 27 protons.
  1. True
  2. False
Grade 8 Reactions
What law says that nothing can be created or destroyed in a reaction?
  1. The Law of Physics
  2. The Law of Conservation and Mass
  3. The Law of Chemistry
  4. The Law of Conserving Chemical Reactions
Grade 8 Biochemical Pathways
What process produces carbon dioxide?
  1. photosynthesis
  2. replication
  3. mutation
  4. respiration
Grade 8 Acids and Bases
Which set of substances listed is correctly sequenced from most to least acidic?
  1. pH = 3, pH = 2, pH = 9
  2. pH = 7, pH = 8, pH = 9
  3. pH = 1, pH = 3, pH = 6
  4. pH = 8, pH = 10, pH = 14
Grade 8 Properties of Matter
States of matter are determined by which of the following?
  1. light
  2. breaking
  3. plasma
  4. temperature
Grade 8 Properties of Matter
Jackie gets a hair cut. The haircut is a(n)                     .
  1. chemical change
  2. endothermic reaction
  3. physical change
  4. exothermic reaction
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
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