"Melting and Solidification" Changes in State of Matter PPT Courseware 12

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"Melting and Solidification" Changes in State of Matter PPT Courseware 12

Changes in physical state

Can you find the following two pieces of physics knowledge in this water cycle diagram?

1. There are several states of water;

2. Water can change between various states.

Iron that is solid at room temperature can become liquid at high temperatures.

Did you know that nitrogen also comes in liquid form? It can even become solid.

1. There are three states of matter: solid, liquid, and gas.

2. The change of matter from one state to another is called change of state of matter.

Explore the temperature changes during melting

(1) Experimental device:

(2) Things to note during the experiment:

①Safe use of alcohol lamps

②Indirect heating: uniform

(3) Hypo and paraffin melting data table

(4) Melting curve analysis of sea wave and wax:

① What is the state of the sea wave during the period of time corresponding to the AB segment curve? How does the temperature change?

② At which point on the curve does the sea wave begin to melt?

③ What is the state of the sea wave during the period corresponding to segment BC? Does the temperature change? Was the sea wave heated during this time?

④ What is the state of the sea wave in the time period corresponding to the CD segment? How does the temperature change?

⑤ How does the temperature of the wax change during the entire process?

(5 Conclusion:

1. Hypo has a certain melting temperature; (up to 48°C) the melting process absorbs heat and keeps the temperature constant.

2. Paraffin wax does not have a certain melting temperature. The melting process absorbs heat and the temperature rises.

Classification of solids

Crystal: sea wave, ice, salt, naphthalene, various metals

Amorphous: wax, rosin, glass, asphalt

1. the difference

Crystals have a certain melting temperature;

Amorphous materials do not have a certain melting temperature.

2. Melting point: The temperature at which a crystal melts.

3. Crystal melting conditions:

(1) Reach the melting point;

(2) Continue to absorb heat.

Analyze the solidification curve of sea waves

(1) The DE segment indicates that the sea wave is in _____ state, _____ heat (optional "suck" or "release"), and temperature ________.

(2) The EF segment indicates that the physical state of sea waves is __________, _____ heat, and temperature ________.

(3) The FG segment indicates that the state of the sea wave is ______, _____ hot, and the temperature ________.

Freezing point

1. There is a definite temperature when a crystal solidifies; there is no definite temperature when a non-crystal solidifies.

2. Freezing point: The temperature at which a liquid crystalline substance solidifies.

For the same crystalline substance, freezing point = melting point.

3. Crystal solidification conditions:

(1) Reach the freezing point;

(2) Continue to release heat.

Melting endotherm and solidification exotherm

If you take the melting ice into a room with a temperature of 0°C, will the ice continue to melt?

Melting conditions:

(1) Reach the melting point;

(2) Continue to absorb heat.

In summer, ice at 0°C or water of equal mass at 0°C is used to cool soda. The result is ( )

A. The effect of using ice is better because the temperature of ice is low

B． Using water works well because water absorbs heat more easily than ice

C. The effect of using ice is good because the temperature of ice's heat absorption does not change.

D． Both have the same effect

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"Melting and Solidification" PPT courseware:

Contents of the first part of the PPT courseware "Melt and Solidify": Three states of matter: Take water as an example: ice rain, white gas, fog, dew, frost, snow, hail Water vapor Solid state: ice, frost, snow and hail Liquid state: rain, fog, dew, white gas Gaseous state: water Vapor (invisible to the human eye) ... ...

"Melting and Solidification" PPT:

"Melt and Solidification" PPT Part 1 Content: State Changes Solid, liquid, and gaseous states are the three common states of matter. Solid state: such as aluminum, gold, silver, copper, iron, etc. are usually solid. Liquid state: such as water, vinegar, oil, etc. are usually liquid. Gaseous state: such as oxygen, hydrogen,...

"Exploring the Characteristics of Melting and Solidification" Material Forms and Their Changes PPT Courseware 2:

"Exploring the Characteristics of Melting and Solidification" Material Form and Its Changes PPT Courseware 2 Learning Objectives 1. Know what melting and solidification are. Understand the endotherms of melting and the exotherms of solidification. Know the characteristics of crystalline and amorphous melting and solidification. Understand the physical meaning of melting curves. 2. know..

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Update Time: 2024-11-19

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