When a Substance Melts at Its Normal Melting Point,the Sign

question 35

Multiple Choice

When a substance melts at its normal melting point,the sign of ΔH is ________ and the sign of ΔS of this phase change is ________.

• A)+,-
• B)-,+
• C)+,+
• D)-,-

Recognize the ecological impacts of different pollutants on water bodies.

Understand the methods for reducing thermal water pollution.

Comprehend the effects of organic and inorganic waste on oxygen levels in water bodies.

Grasp the concept and stages of cultural eutrophication.

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Definitions:

Conduction

The process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential.

Phaneritic Texture

A texture of igneous rocks characterized by large, visible crystals, indicative of slow cooling magma.

Trapped Gas

Trapped gas refers to gas that has been contained within another material, such as within rock formations or ice, which can be released under certain conditions.

Andesite

An intermediate-composition igneous rock that is the fine-grained equivalent of diorite; typically gray or greenish-gray, commonly with phenocrysts of cream-colored feldspar or dark amphibole.