Question

1. choose all that apply.

ionic compounds exist as which two things?
as repeating, alternating cations and anions
in all three states of matter
in a crystal lattice
as separate molecules

1. choose the best answer.

which of these helps ionic solids have the properties of high melting points, brittleness, and strong bonds?
crystalline lattice structure
small size
amorphous structure
brittle structure

Explanation:

• For question 6: Ionic compounds form a crystal lattice with repeating, alternating cations and anions. They are typically solids at room - temperature (not in all three states of matter easily like some molecular substances) and do not exist as separate molecules (that's more for covalent compounds).
• For question 7: The crystalline lattice structure of ionic solids gives them high melting points (strong electrostatic forces between ions in the lattice), brittleness (when force is applied, ions shift and like - charged ions repel causing breakage), and strong bonds (due to the ionic bonding in the lattice). Small size is not relevant in this context for these properties. Amorphous structure is not characteristic of ionic solids (they have a regular lattice). And "brittle structure" is a property, not the cause of the properties.

Answer:

1. as repeating, alternating cations and anions, in a crystal lattice
2. crystalline lattice structure