11. a substance is cooled for 16 minutes from a temperature of 206°c. the cooling curve for the substance is…

11. a substance is cooled for 16 minutes from a temperature of 206°c. the cooling curve for the substance is shown below. cooling curve for a substance during which intervals is some or all of the substance in the solid phase? a. ef only b. de and ef c. cd, de, and ef d. the solid phase is not shown on the cooling curve.

11. a substance is cooled for 16 minutes from a temperature of 206°c. the cooling curve for the substance is shown below. cooling curve for a substance during which intervals is some or all of the substance in the solid phase? a. ef only b. de and ef c. cd, de, and ef d. the solid phase is not shown on the cooling curve.

Answer

Brief Explanations:

In a cooling - curve, the flat sections represent phase - change processes. After the last phase - change (from liquid to solid), the substance is in the solid phase. The section EF comes after the phase - change section DE (where the substance changes from liquid to solid). So, during EF, the substance is in the solid phase.

Answer:

A. EF only