"Sublimation and Condensation" Temperature and Physical State Changes PPT Courseware

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"Sublimation and Condensation" Temperature and Physical State Changes PPT Courseware

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sublimation

Concept The phenomenon in which matter changes directly from ____ to ____

Features Sublimation requires____

Sublime

Concept The phenomenon in which matter changes directly from ____ to ____

Features Ninghua requires ____

Sublimation refers to the process in which a substance directly changes from a solid state to a gaseous state. Note that there is no intermediate link such as a liquid state in this change of physical state. That is, during the sublimation process, the states that a substance passes through are only solid and gaseous, but not liquid. For example, when the temperature is below 0°C in winter, all the wet clothes hanging outside are frozen, but these clothes will also dry out because the ice directly sublimates into water vapor.

Sublimation refers to the process in which a substance changes from a gaseous state directly to a solid state, without passing through the intermediate state - liquid state during this state change. For example, the frost you see in winter is formed by the direct condensation of water vapor in the air.

Just like sublimation, not all substances can undergo sublimation. It can only occur for certain substances under certain conditions.

Knowledge point 1 Sublimation

1. Xiaohong put a small amount of iodine in the flask, heated it slightly and found that the solid iodine turned into purple iodine vapor. This is because the iodine occurred ()

A. Evaporation B. Liquefaction C. Boiling D. Sublimation

2. When cooking, it is not advisable to heat iodized salt and oil at the same time. This is because iodine easily ()

A.Liquefaction B.Vaporization C.Sublimation D.Melt

3. In winter, when frozen clothes gradually dry out and ice sculptures slowly become smaller, the matter changes directly from the _______ state to the _______ state, which is called _______.

4. In order to prevent food from rotting and deteriorating during long-distance transportation, food factories usually put some dry ice (i.e. solid carbon dioxide) around the food. This is to use dry ice to _______ to keep the food at a low temperature.

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For more information about the PPT courseware "Sublimation and Sublimation Temperature and Changes in the State of Matter", please click the Sublimation and Sublimation ppt Temperature and Changes in the State of Matter ppt tag.

"Sublimation and Condensation" PPT courseware:

"Sublimation and Condensation" PPT courseware Part One: Phenomenon Study What kind of change in physical state occurred? Endothermic or exothermic 1. Spring is warm and flowers are blooming and ice and snow melt. 2. Rivers freeze in the cold winter. 3. Wetlands dry up after rain. 4. Water drops fall when you open a lunch box. Phenomenon and thinking 1..

"Sublimation and Condensation" PPT:

"Sublimation and Sublimation" PPT Part One Content: Exploration 1 Activity: Heat the iodine crystals in the glass container and observe what phenomena appear in the glass container? After stopping the heating, what happens to the iodine in the glass container? Thinking: Sublimation What conditions are needed for He Ninghua...

"Sublimation and Sublimation" Temperature and Physical State Changes PPT Courseware 3:

"Sublimation and Sublimation" Temperature and Physical State Changes PPT Courseware 3 Review Review 1. What are the conversion processes between solid and liquid called? Endothermic or exothermic? The change of matter from solid to liquid is called melting, which is an endothermic process. ; The change of substance from liquid to solid is called solidification, which is...

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Update Time: 2024-10-20

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