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6. Which is the smallest particle?

  • An atom
  • A star
  • A speck of dust
  • A grain of sand

7. The following chemical reaction occurs: N2 + 3 H2 -> 2 NH3 How many atoms of hydrogen are there in the product?

  • 6 atoms of Hydrogen
  • 3 atoms of Hydrogen
  • 5 atoms of Hydrogen
  • 2 atoms of Hydrogen