- The worksheet correctly identifies the bond type for each compound based on the elements involved: ionic bonds form between metals and non-metals, covalent bonds between non-metals, and metallic bonds between metals.
- Oxidation states are assigned following standard rules: oxygen is typically -2, hydrogen is +1 (except in metal hydrides), and the sum of oxidation states in a neutral compound is zero or matches the ion’s charge.
- For polyatomic ions like PO₄³⁻ and NO₂⁻, the total oxidation state equals the ion’s charge, requiring calculation of individual atom states to satisfy that sum.
- In alloys like Cu-Zn and Au-Pt, all atoms are metals, so the bond type is metallic, with oxidation states listed as 0 since they are elemental forms in a mixture.
- Compounds like Fe₂O₃ and TiO₂ are ionic because they consist of a metal and non-metal, despite having multiple atoms; the metal retains its positive oxidation state while oxygen remains -2.
- Glucose (C₆H₁₂O₆) is covalent because it contains only non-metals (C, H, O), and its oxidation states reflect typical values: C = +4, H = +1, O = -2, summing to zero for the neutral molecule.
Parent Tip: Review the logic above to help your child master the concept of atomic bonding worksheet.
