Conceptual Problems Key: These problems are designed to check your understand 1.

Question

Conceptual Problems Key: These problems are designed to check your understand 1.25 ing of the concepts associated with some of the main topics a. Sodium metal is partially melted. What are the two phases presented in the chapter. A strong conceptual understanding of chemistry is the foundation for both applying chemical b. A sample of sand is composed of granules of quartz (sili- knowledge and solving chemical problems. These problems vary in level of difficulty and often can be used as a basis for group discussion. present? con dioxide) and seashells (calcium carbonate). The sand is mixed with water. What phases are present?

Explanation / Answer

1. Melting indicates change of state from solid to liquid. When a metal is partially melted, the phases present are solid and liquid.

2. There are three phases- liquid water, solid quartz and solid seashells.

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