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Eighth Grade (Grade 8) Chemistry Questions

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Grade 8 Biochemical Pathways
Which chemical process happening in cells releases energy?
  1. respiration
  2. photosynthesis
  3. breathing
  4. exercise
Grade 8 Bonds and Mixing
Compare and contrast mixtures and compounds. Which statement is true about mixtures and compounds?
  1. Mixtures and compounds are the same throughout.
  2. Mixtures and compounds are made of two or more elements in a definite proportion.
  3. Mixtures must be separated by chemical methods and compounds by physical methods.
  4. Mixtures contain two or more elements physically combined and compounds contain two or more elements chemically combined.
Grade 8 Biochemical Pathways
Which is the correct word equation for respiration?
  1. oxygen + carbon dioxide -> water + glucose
  2. water + carbon dioxide -> oxygen + glucose
  3. carbon dioxide + glucose -> water + oxygen
  4. oxygen + glucose -> water + carbon dioxide
Grade 8 Biochemical Pathways
What are the products of respiration?
  1. water + carbon dioxide
  2. oxygen + water
  3. glucose + carbon dioxide
  4. glucose + oxygen
Grade 8 Biochemical Pathways
Why do plants convert glucose to starch?
  1. So the plant can use it to make chloroplasts
  2. So it can be stored for later
  3. because plants use it for photosynthesis
  4. because plants use it for respiration
Grade 8 Bonds and Mixing
[math]MgF_2[/math] is an example of a(n)
  1. Ionic bond
  2. Metallic bond
  3. Covalent bond
  4. Noble bond
Grade 8 Bonds and Mixing
Grade 8 Reactions
When oxygen in the air reacts with iron, iron oxide forms. Which of the following statements is correct?
  1. This is a physical change.
  2. This is a chemical change.
  3. Iron and iron oxide have the same properties.
  4. Oxygen and iron have similar properties.
Grade 8 Chemistry
Which of the following statements does NOT describe a physical property of a piece of chalk?
  1. Chalk is a solid
  2. Chalk can be broken into pieces
  3. Chalk is white
  4. Chalk will bubble in vinegar
Grade 8 Periodic Table and Elements
Grade 8 Macromolecules
Grade 8 Macromolecules
Grade 8 Periodic Table and Elements
Grade 8 Biochemical Pathways
What is the equation for photosynthesis?
  1. carbon dioxide + oxygen -> glucose + water
  2. carbon dioxide + water -> glucose + oxygen
  3. oxygen + glucose -> carbon dioxide + water
  4. water + oxygen -> glucose + carbon dioxide
Grade 8 Properties of Matter
The formula for density is
  1. Volume x mass
  2. Mass/volume
  3. None of the above
Grade 8 Properties of Matter
Ductility is the ability for a metal to be
  1. rolled into sheets
  2. pulled into wires
  3. pressed into angles
  4. melted into molds
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