"Image Problems in the Change of State of Matter" PPT on Change of State of Matter

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"Image Problems in the Change of State of Matter" PPT on Change of State of Matter

Special training

【Topic Overview】

Temperature-time images are often involved in questions about changes in the state of matter, and image questions are the focus and difficulty of this chapter.

Problem-solving ideas: (1) Look at the physical quantities and units represented by the horizontal and vertical axes; (2) Observe the image, analyze the changing trends or patterns of the image, and clarify the physical meaning expressed by the image; (3) Find special points and explore "Starting point, end point, intersection point, inflection point", etc., to determine the conditions or physical laws implicit in each point; (4) Use relevant formulas and laws to solve problems.

Type 1: Melted and solidified images

1. Three solid substances A, B, and C have equal masses. During the heating process, they absorb the same amount of heat in the same time. It can be judged from the image of their temperature changing with time (D)

A. A and B are crystals, and C is amorphous.

B. B is crystal, A and C are amorphous

C. B is amorphous, and the melting point of A is lower than that of C.

D. B is amorphous, and the melting point of A is higher than that of C.

2. As shown in the picture, the temperature of ice changes with time when it is heated. The following judgment about this process is correct (A)

A. The melting point of ice is 0 ℃

B. The temperature of the ice in the 4th minute is higher than that in the 2nd minute

In section C.CD, the substance is in gaseous state

D.DE segment represents the melting process of ice

3. After experiments to explore the melting and solidification characteristics of crystals and amorphous crystals, Xiaoqiang drew four images as shown in the figure. Among them, the image that can reflect the solidification characteristics of crystals is (D)

Type 2 boiling images

4. It is known that when a certain mass of water is heated, the relationship between its temperature and time is shown as the solid line A in the figure. If other conditions remain unchanged and only the amount of water is increased, the curve of its temperature changing with time is (B)

A. Curve E B. Curve C

C. Curve D D. Curve B

5. A group conducted an experiment to explore the boiling of water. During the heating process, the alcohol lamp suddenly went out. After inspection, it was found that the alcohol was used up. They added alcohol and continued to heat the water to complete the experiment. During the whole process, a classmate kept recording the temperature changes of the water. They made the image as shown in the figure based on the experimental record data. Answer the following questions based on the image:

(1) The team measured the boiling point of water to be 100°C;

(2) In the experiment, after the alcohol lamp is extinguished, it corresponds to the AB segment in the image;

(3) If the water is boiling, stop heating and the water cannot (select "can" or "cannot") continue to boil.

Keywords: PPT courseware for eighth-grade physics volume 1 of the People's Education Press is free to download, image problems in changes in the state of matter PPT download, changes in the state of matter PPT download, .PPT format;

For more information about the "Image Problems in Changes of State of Matter" PPT courseware, please click on the "Image Problems in Changes of State of Matter ppt" ppt tag.

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Update Time: 2024-11-22

This template belongs to Physics courseware People's Education Edition Physics for Grade 8, Volume 1 industry PPT template

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