Which kind of bond forms: ionic, covalent or metallic

Answer Key - Grade 10 Science Worksheet

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

1. 1.

   The Na–Cl difference is 2.23. Using Pauling's formula, percent ionic = (1 − e^(−d²/4)) × 100, what is the bond's ionic character, to 0.01%, Ari?

   71.15 %
2. 2.

   The O–H difference is 1.24. Using Pauling's formula, percent ionic = (1 − e^(−d²/4)) × 100, what is the bond's ionic character, to 0.01%, Bo?

   31.91 %
3. 3.

   The C=O difference is 0.89. Using Pauling's formula, percent ionic = (1 − e^(−d²/4)) × 100, what is the bond's ionic character, to 0.01%, Esme?

   17.97 %

4. Read this first

   Electronegativity difference in common compounds (Pauling values, PubChem) (PubChem)

   compound	bond	difference
   NaCl	Na–Cl	2.23
   CaCl₂	Ca–Cl	2.16
   MgO	Mg–O	2.13
   Al₂O₃	Al–O	1.83
   H₂O	O–H	1.24
   CO₂	C=O	0.89
   O₂	O=O	0

5. 4.

   Using the table, how should the bonds in Al₂O₃ be classed, Jun?

   • Ionic
   • Metallic
   • Nonpolar covalent
6. 5.

   Using the table, what kind of bond is O–H in water, Kira?

   • Nonpolar covalent
   • Ionic
   • Polar covalent
7. 6.

   Using the table, why is the bond in O₂ nonpolar, Luz?

   • Its difference is 0
   • Oxygen is a metal
   • Its difference is 1.7
8. 7.

   Two atoms have an electronegativity difference of 2.0. What bond is likely, Milo?

   • Ionic
   • Polar covalent
   • Metallic
9. 8.

   Why do metals conduct electricity, Ren?

   • Their ions are fixed in place tightly
   • Their pooled electrons can move
   • They share pairs
10. 9.

    Why can a metal be bent into a new shape without shattering, Tala?

    • It has no electrons
    • Ions slide within the sea
    • Its bonds are ionic and rigid
11. 10.

    What holds a metal's atoms together, Zee?

    • Pairs shared between two neighbor atoms
    • Ions pulled by the electron sea
    • Opposite ions in a lattice