Question

co₂ is correctly named carbon dioxide, but cacl₂ is calcium chloride, with no di. why? (choose all that apply)
□ carbon dioxide is made up of two nonmetals and is a molecule.
□ calcium chloride is made up of a metal and a nonmetal and is ionic.
□ it should be bi, not di.
□ only elements that begin with vowels get prefixes.
20 multiple answer 1 point
periodic trends are based on which of these parameters? (choose all that apply.)
□ size of the atom
□ charge of the electron
□ charge of the nucleus
□ effective nuclear charge
21 multiple answer 1 point
the chemical bonds that are identified by electronegativity are which of the following? (choose all that apply.)
□ an ionic bond
□ a nonpolar covalent bond
□ an atomic bond
□ a polar covalent bond

Explanation:

Question 1 (Naming Compounds)

• For \( \ce{CO2} \): It's a covalent compound (two nonmetals, C and O) so uses prefixes (di- for 2 O).
• For \( \ce{CaCl2} \): It's an ionic compound (metal Ca + nonmetal Cl), ionic compounds don't use prefixes for subscripts.
• "It should be bi, not di" is wrong (bi- is for polyatomic ions, not simple binary).
• "Only elements that begin with vowels get prefixes" is wrong (prefixes depend on bonding type, not element name start).

• Periodic trends (atomic size, ionization energy, etc.) relate to atom size (e.g., atomic radius), nuclear charge (protons, affects attraction), and effective nuclear charge (net positive charge felt by electrons).
• Electron charge is constant (\( -1 \)), so it doesn’t drive trends.

• Electronegativity differences determine bond type:
• Ionic: Large difference (metal-nonmetal).
• Polar covalent: Moderate difference (nonmetal-nonmetal, unequal sharing).
• Nonpolar covalent: Small/no difference (nonmetal-nonmetal, equal sharing).
• "Atomic bond" is not a recognized bond type.

Answer:

A. Carbon dioxide is made up of two nonmetals and is a molecule.
B. Calcium chloride is made up of a metal and a nonmetal and is ionic.

Question 2 (Periodic Trends)