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Ninth Grade (Grade 9) Thermodynamics Questions

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Grade 9 Thermodynamics
Allotropes are considered to be what?
  1. Chemical elements to exist in two or more different forms.
  2. An atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
  3. A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.
  4. It is a type of chemical bond that generates two oppositely charged ions.