A large piece of rock salt is added to a test tube containing water. The level o

Question

A large piece of rock salt is added to a test tube containing water. The level of water is marked and the test tube is sealed. After all the salt is dissolved, it is noted that the level of liquid is below the original marked level. What conclusion(s) can we draw from this experiment? WHY?

            a.         The mass of the system has decreased

            b.         When salt is added to water a chemical change occurs

            c.         The density of salt water is greater than the density of pure water

            d.         The volume of the system has decreased as the result of a physical change.

Explanation / Answer

Answer :C ,D . The density of the salt water solution is greater than the density of pure water. Also, this is a physical change, Therefore , the answers will be C, D

The volume of the substance = (mass÷density) .

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