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Ninth Grade (Grade 9) Chemistry Questions

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Grade 9 Atomic Structure
Why does an atom have no net electric charge?
  1. Its subatomic particles carry no electrical charge.
  2. The positively charged protons cancel out the negatively charged neutrons.
  3. The positively charged neutrons cancel out the negatively charged electrons.
  4. The positively charged protons cancel out the negatively charged electrons.
Grade 9 Atomic Structure
What are the three particles that make up an atom?
  1. protons, neutrons, and isotopes
  2. neutrons, isotopes, and electrons
  3. positives, negatives, and electrons
  4. protons, neutrons, and electrons
Grade 9 Bonds and Mixing
Grade 9 Biochemical Pathways
Grade 9 Periodic Table and Elements
An element is a substance that
  1. exists naturally as a solid, liquid, and gas.
  2. cannot be broken down into simpler substances.
  3. is above 86 on the periodic table.
  4. can be broken down only by chemical means.
Grade 9 Biochemical Pathways
Which are typically products of cellular respiration?
  1. carbon dioxide and water
  2. oxygen and carbon dioxide
  3. water and glucose
  4. glucose and oxygen
Grade 9 Biochemical Pathways
Which are typically products of photosynthesis?
  1. oxygen and carbon dioxide
  2. glucose and oxygen
  3. carbon dioxide and water
  4. water and glucose
Grade 9 Biochemical Pathways
Which correctly describes the purpose of photosynthesis?
  1. to release energy by decomposing glucose
  2. to store energy in the form of carbon dioxide
  3. to use sunlight energy to make sugars
  4. to create water for hydration
Grade 9 Biochemical Pathways
Which most accurately describes the purpose of cellular respiration?
  1. to decompose glucose into energy that can be used for cellular functions
  2. to decompose usable energy into smaller parts
  3. to decompose different types of substances to be used to construct other parts of the cell
  4. all of the above
Grade 9 Atomic Structure
What does the octet rule state?
  1. Atoms become less stable with eight electrons in their outer energy level.
  2. Atoms become more stable with eight electrons in their outer energy level.
  3. Atoms will change their configurations and become a noble gas.
  4. Atoms will become more reactive and chemically bond with noble gases.
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