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Eighth Grade (Grade 8) Chemistry Questions

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Grade 8 Periodic Table and Elements
The symbol for tin is Sb.
  1. True
  2. False
Grade 8 Matter
Solids have a crystal lattice because the particles                                .
  1. vibrate around fixed positions.
  2. move in all directions.
  3. attract one another strongly.
  4. are not compressible at all.
Grade 8 Periodic Table and Elements
What is the atomic number of hydrogen?
  1. 0
  2. 1
  3. 2
  4. 3
Grade 8 Acids and Bases
Which of the following would be most useful in determining if a substance is either an acid or a base?
  1. filter paper
  2. litmus paper
  3. thermometer
  4. triple beam balance
Grade 8 Atomic Structure
A particle that cannot be broken down further is a(n)
  1. compound.
  2. mixture.
  3. element.
  4. atom.
Grade 8 Molecules and Compounds
A compound differs from a mixture in that a compound always has a                            .
  1. homogeneous composition
  2. maximum of two components
  3. minimum of three components
  4. heterogeneous composition
Grade 8 Periodic Table and Elements
Copper is located in Group 4 and Period 11 of the periodic table.
  1. True
  2. False
Grade 8 Periodic Table and Elements
The first Periodic Table was organized by                .
  1. atomic number
  2. atomic mass
  3. chemical symbol
Grade 8 Atomic Structure
A(n)                 is the building block of matter.
  1. nucleus
  2. atom
  3. proton
  4. electron
Grade 8 Bonds and Mixing
MgF2 is an example of a(n)                .
  1. ionic bond
  2. metallic bond
  3. covalent bond
  4. noble bond
Grade 8 Periodic Table and Elements
Gold's atomic number is 79.
  1. True
  2. False
Grade 8 Properties of Matter
                is the mass per unit volume of a substance.
  1. Mass
  2. Weight
  3. Density
  4. Chemistry
Grade 8 Properties of Matter
Sugar dissolving in water is an example of a                .
  1. chemical change
  2. physical change
Grade 8 Bonds and Mixing
How is a mixture different from a compound?
  1. A mixture has a chemical formula. A compound does not.
  2. Substances in a compound are chemically combined. The substances in a mixture are not.
  3. A compound is easier to separate than a mixture.
  4. A mixture forms with a chemical reaction. A compound does not.
Grade 8 Biochemical Pathways
What are the products of photosynthesis?
  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)
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