McGraw-Hill Online Learning Center Test

1. Review the image and answer the following questions.

Why is water considered "the universal solvent"?

A. Water dissolves any polar or nonpolar substance.
B. Water dissolves nonpolar substances readily, unlike most other fluids.
C. Water is considered the universal solvent only because of its abundance on the earth.
D. Water readily causes polar substances to come apart, making it an excellent biological solvent.

2. When salt crystals are placed in water, the sodium and chloride ions cannot reform salt crystals. Why not?

A. Water molecules form hydration spheres surrounding and separating the sodium and chloride ions.
B. In water, the ionic charges are reversed, so the sodium and chloride ions repel each other.
C. The salt crystals are permanently altered by being placed in water.
D. Chemical reactions occur when salt enters the water, making new compounds.

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