Which kind of bond forms: ionic, covalent or metallic

Answer Key - Grade 10 Science Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

1. 1.

   In MgO, oxygen's electronegativity is 3.44 and magnesium's is 1.31. Using (1 − e^(−d²/4)) × 100, what is the bond's percent ionic character, to 0.01%, Ari?

   67.83 %
2. 2.

   In CaCl₂, chlorine's electronegativity is 3.16 and calcium's is 1. Using (1 − e^(−d²/4)) × 100, what is the bond's percent ionic character, to 0.01%, Bo?

   68.85 %
3. 3.

   In Al₂O₃, oxygen's electronegativity is 3.44 and aluminum's is 1.61. Using (1 − e^(−d²/4)) × 100, what is the bond's percent ionic character, to 0.01%, Esme?

   56.71 %
4. 4.

   Why does table salt melt only at a very high temperature, Jun?

   • Strong attractions between ions
   • A sea of free electrons
   • Weak forces between separate molecules
5. 5.

   Why does salt water conduct electricity when solid salt doesn't, Kira?

   • Its ions are free to move
   • Water makes new electrons
   • Salt becomes a metal
6. 6.

   Milo says NaCl is held together by shared electron pairs. Agree or disagree?

   • Disagree: an electron moves to make ions
   • Agree: bonds are shared pairs
   • Agree: Na and Cl share one pair of electrons
7. 7.

   Noah says water's O–H bonds are ionic because oxygen pulls hard. Agree or disagree?

   • Agree: water is a salt
   • Disagree: they share pairs unequally
   • Agree: oxygen takes the electrons fully
8. 8.

   Pia says NaCl's bond is 100% ionic. Agree or disagree?

   • Agree: ionic means 100%
   • Disagree: about 71% by Pauling's formula
   • Agree: salt shares no electrons whatsoever
9. 9.

   Al₂O₃'s difference is 1.83, just above 1.7. How is it best described, Tala?

   • Metallic
   • Ionic, with some covalent character
   • Purely covalent
10. 10.

    Which bond is more ionic, Na–Cl (2.23) or Al–O (1.83), Zee?

    • Na–Cl
    • Al–O
    • They are equal