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6. At the positive electrode, which substances form first?

  • Gases
  • Halides
  • Oxides
  • Hydroxides

7. What is true about isotopes?

  • Mass number is different, atomic number is different.
  • Mass number is different, atomic number is the same.
  • Mass number is the same, atomic number is different.
  • Mass number is the same, atomic number is the same.

8. Acid + Metal = ?

  • Salt + Water
  • Salt + Water + Hydrogen
  • Salt + Hydrogen
  • Salt + Water + Carbon Dioxide