"Changes in State of Matter Temperature" State of Matter and Its Changes PPT Courseware 3

Description

"Changes in State of Matter Temperature" State of Matter and Its Changes PPT Courseware 3

Knowledge sorting

1. Temperature is a physical quantity that represents ___________.

2. Commonly used thermometers measure temperature based on the property of __________.

3. The letter C on the thermometer indicates that the ____ temperature is used. It specifies the temperature of _________ as 0 degrees and the temperature of __________ as 100 degrees.

4. Thermometers are classified according to their uses:_______________

5. Correct use of experimental thermometer:

①Before measuring temperature, observe _____ and recognize ______;

②When measuring temperature, the _____ of the thermometer must be in full contact with the object being measured;

③When reading, the glass bulb of the thermometer cannot leave the object being measured. The line of sight must be perpendicular to the glass tube and __________ with the liquid column.

Practical exercises

1. Use a thermometer to measure the temperature in the beaker. The correct method among the several methods shown in the picture is ( )

2. When the TV is working normally, due to the heating of some components, the back cover will feel a little warm when you try it with your hands. It is estimated that the temperature at the back cover is about ( )

A. -20℃ B. 10℃ C. 40℃ D. 80℃

3. As shown in the picture, Xiaohong made a homemade liquid thermometer using a vial, rubber stopper and glass tube. This thermometer works according to the laws of liquid __________. In actual use, it was found that the liquid column in the glass tube of the thermometer did not change significantly, resulting in inaccurate readings. In this regard, please make a suggestion for improvement: use a thinner glass tube, use a larger volume bottle, and use a liquid with a larger expansion coefficient.

1. Melting and Solidification

1. melt:

(1) Melting: The process in which an object is __________ is called melting.

(2) Melting point: The temperature at which a crystal melts is called the melting point.

The melting points of different crystals are ______.

2. solidification:

(1) Solidification: The process in which matter changes from ___________ is called solidification.

(2) Freezing point: The temperature at which an object solidifies from a liquid to a crystal is called the freezing point.

The freezing point and melting point of the same substance are ______.

3. Solid

Crystal: Has melting point (freezing point)

Amorphous: no melting point (freezing point)

Conditions for crystal melting: the temperature reaches the melting point and it absorbs heat

Conditions for crystal solidification: the temperature reaches the freezing point and heat is released

2. Vaporization and liquefaction

1. Vaporization:

(1) Vaporization: The process by which a substance is _________ is called vaporization.

(2)Vaporization method:___________.

(3) Boiling point: The temperature at which a liquid boils is called the boiling point.

Different liquids have boiling points______.

As the pressure of the gas increases, the boiling point of the liquid ______; as the pressure of the gas decreases, the boiling point of the liquid ______.

2. The difference and connection between evaporation and boiling

Occurrence site Only on the surface of the liquid Inside and on the surface of the liquid

Temperature conditions Any temperature At boiling point

Intensity Slow Violent

Influencing factors Surface area Air flow rate Temperature Heating speed

Temperature changes, cooling, absorbing heat, temperature remains unchanged

Common features: vaporization, heat absorption

3. Picture A is a diagram of the experimental device for "observing the boiling of water".

⑴When installing the experimental device, the ____ iron ring of the two iron rings A and B should be fixed first.

⑵When water boils, the thermometer indicates as shown in Figure B. From this, it can be seen that the boiling point of water is ____ ℃.

3. Sublimation and sublimation

1. Sublimation: The transformation of matter from ______________ is called sublimation.

2. Sublimation and heat absorption

Example: *In winter, clothes that are frozen outdoors will also dry.

*In summer, the mothballs placed in the closet become smaller or even disappear.

3. Sublime: Substance is called sublime from ______________.

4. Condensation heat release

Example: formation of sunflower cream.

*In the cold winter, "ice flowers" form on the inner surface of the window glass in the morning.

*The formation of "clouds" high in the sky.

Selected Exercises

1. Carefully observe the "Water Cycle State Change Diagram" and fill in the appropriate name of the physical state change in the blank box.

2. Fruit farmers often wrap fruits in fresh-keeping bags. One of the purposes of doing so is to reduce the _________ of water in the fruits. The weather when snow melts is sometimes colder than when it snows. This is because snow melting is a __________ process and needs to absorb _________.

3. There is a folk proverb in our country: "It's cold before frost, and it's cold after snow." Frost is formed when water vapor in the air ________ when the temperature is low; snow needs ______ heat to melt.

4. As shown in the figure, the temperature changes with time during the heating process of a piece of ice that a student brought back from outside. It can be seen from the figure:

(1) The initial temperature of this piece of ice is _____℃, and the melting point is ___℃;

(2) After heating for _____min, the ice begins to melt;

(3) When heated for 3 minutes, the state of the substance is _____;

(4) The melting process requires _____min;

(5) After _____min, the temperature rises by 20 ℃.

Keywords: Teaching courseware of states of matter and its changes, teaching courseware of temperature changes in states of matter, Beijing Normal University edition eighth grade physics PPT courseware download, eighth grade physics slide courseware download, download of PPT courseware of states of matter and its changes, changes in states of matter Temperature PPT courseware download, .PPT format;

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

"Changes in State of Matter - Temperature" State of Matter and Its Changes Flash Animation Courseware:

"Changes in State of Matter and Temperature" Flash animation courseware on states of matter and their changes. This courseware is a Flash animation courseware on physical states and their changes in the eighth grade volume of Beijing Normal University. It is suitable for middle school physics teaching. It has rich content and vivid animations. Please download it! Keywords: temperature of change of state of matter..

"Changes in State of Matter Temperature" State of Matter and Its Changes PPT Courseware 2:

"Changes in State of Matter Temperature" State of Matter and Its Changes PPT Courseware 2 States of Matter Matter can be divided into three states: solid, liquid and gaseous. Thinking: What are the characteristics of the state of matter? Characteristic table of solid, liquid and gas State Shape Volume Solid state Certain shape..

"Changes in the State of Matter - Temperature" PPT courseware on states of matter and their changes:

"Temperature of Changes in State of Matter" PPT courseware on states of matter and their changes [Experience 1] Activities on states of matter and changes in matter: Review the knowledge about states of matter in primary school textbooks (1) Water has three states, which are liquid _________ and solid state. The ________ and the gaseous ________..

File Info

Update Time: 2024-10-01

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume one industry PPT template

Preview