"Melting and Solidification" State of Matter and Its Changes PPT Courseware 2

Description

"Melting and Solidification" State of Matter and Its Changes PPT Courseware 2

The process of a substance changing from solid to liquid is called melting.

The process of a substance changing from liquid to solid is called solidification.

Inquiry - the melting of matter

When doing a hypo-melting experiment, why not use an alcohol lamp to heat it directly, but put the test tube in a beaker with water, and then use an alcohol lamp to heat it through an asbestos net?

What is the appropriate amount of water in the beaker?

Where is the appropriate position for the thermometer's bubble? Why?

What data should be recorded? How to record data?

What are the steps for the experiment?

Referring to the textbook, can you design your own experimental plan?

As you explore, you should record:

Equipment used in the research.

Research methods and steps.

The data in the exploration process and the results obtained from the analysis of the data by you and your classmates.

melt image

Crystals have a certain melting temperature, called melting point.

Amorphous has no melting point.

Crystalline and amorphous

Sea waves, ice, quartz, crystal, salt, alum, naphthalene, and various metals are all crystals.

Rosin, glass, beeswax, asphalt, etc. are all amorphous.

practise

1. Read the melting point table in your textbook and determine the states of each of the following substances at different temperatures:

Mercury at -40°C ________.

Alcohol at -115°C ________.

Tin at 237°C _________.

Aluminum at 700°C _________.

Naphthalene at 90°C _________.

Naphthalene _______________ at 80°C.

2. The figure shows the solidification images of two substances, A and B, where _____ is the crystal melt. The freezing point of the crystal melt is _____; the melting point of the crystal is _____.

3． Use an alcohol lamp to heat the ice-water mixture. Before the ice in the cup completely melts, the following statement is correct ( ).

A. The ice in the test tube cannot reach the melting point and may melt

B． The ice in the test tube can reach the melting point and melt

C. The ice in the test tube cannot reach the melting point, so it cannot melt

D． Ice in a test tube can reach its melting point but cannot melt

4. There are ice cubes in both basins A and B. There are more ice cubes in basin A and fewer ice cubes in basin B. Bowl A is placed in the sun and basin B is placed in the shade. The ice cubes in the two basins are are not completely melted, then ( ).

A. The temperature of the water in basin A is higher than that of basin B

B． The water temperature in basin B may be higher than that in basin A

C. The water temperature in both basins is the same

D． You can't tell, you have to use a thermometer to measure it.

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For more information about the PPT courseware "Melting and Solidification States of Matter and Their Changes", please click the Melting and Solidification ppt State of Matter and Its Changes ppt tag.

"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: 2024-07-31

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