Question

1. choose all that apply.

the crystalline lattice structure of ionic compounds gives them which three properties?
□ strong bonds
□ high melting points
□ brittleness
□ malleability

1. choose the best answer.

when two or more atoms form a covalent compound, the overall charge of the compound
○ is always positive
○ is always negative
○ is zero
○ depends on the types of atoms in the compound

Explanation:

Question 16

Ionic compounds have a crystalline lattice structure with strong electrostatic bonds (ionic bonds) between ions. This strong bonding leads to high melting points (energy needed to break bonds). The lattice is rigid, so when stress is applied, like charges align and repel, causing brittleness. Malleability is for metals (layers slide), not ionic compounds. So the three properties are strong bonds, high melting points, brittleness.

In covalent compounds, atoms share electrons. The atoms involved are neutral (or form molecules by sharing), so the overall charge of the covalent compound (molecule) is zero. For example, \( \ce{H2O} \), \( \ce{CO2} \) have zero overall charge. It's not always positive/negative, and doesn't depend on atom types (since covalent compounds are neutral molecules).

Answer:

• strong bonds
• high melting points
• brittleness

Question 17