Question

multiple choice 9 points salt molecules and water molecules are represented by circles of different pattern as shown. which best represents salt dissolved in water?
molecule representation
salt
water
diagrams labeled w, x, y, z
options: sample y, sample z, sample x, sample w

Explanation:

When salt (an ionic compound) dissolves in water, the salt ions (represented by the salt - molecule pattern) should be dispersed among the water molecules (represented by the water - molecule pattern) rather than being in separate clusters.

• Sample W: The salt and water molecules are in separate groups (clusters of salt and clusters of water), so this does not represent a solution.
• Sample X: The water - molecule pattern (the two - toned circles) and the salt - molecule pattern (the dark - colored circles) are combined in a way that the salt is dispersed within the water, which is consistent with a dissolved state.
• Sample Y: The distribution seems random but not in the way of a proper solution where solute (salt) is dispersed in solvent (water).
• Sample Z: The salt and water molecules are in separate layers, not a solution.

Answer:

Sample X