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 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 %
3. 3.

   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
4. 4.

   Why is CO₂ a gas at room temperature while NaCl is a solid, Luz?

   • CO₂ has a sea of electrons
   • CO₂ is separate molecules
   • CO₂ is made of ions
5. 5.

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

   • Agree: Na and Cl share one pair of electrons
   • Disagree: an electron moves to make ions
   • Agree: bonds are shared pairs
6. 6.

   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
7. 7.

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

   • Disagree: about 71% by Pauling's formula
   • Agree: ionic means 100%
   • Agree: salt shares no electrons whatsoever
8. 8.

   Why is 1.7 called a rule of thumb, Ren?

   • Bond type changes gradually
   • Metals alone reach 1.7
   • It is an exact law
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?

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