"Moving Water Molecules" Exploring the Water World PPT

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"Moving Water Molecules" Exploring the Water World PPT, 27 pages in total.

Lay a solid foundation

1. What cannot be explained by the three state changes of water is ()

A. molecules are small

B． There are gaps between molecules

C． Molecules are constantly moving

D． The rate of movement of molecules is affected by temperature

2. [High School Entrance Exam·Yancheng] When the water in the electric hot water bottle is heated, the hot water bottle bulges because of the water in the hot water bottle ()

A. Increase in molecular size

B． Increased molecular weight

C． The number of molecules increases

D． Increased spacing between molecules

integrated approach

10． The figure shows a particle diagram of the three-state changes of water. Which of the following statements is correct ()

A. In state A, its volume and shape do not change as the container changes.

B． State B is water vapor

C． Evaporation is the phenomenon of changing from state C to state B

D． When changing from state B to state A, heat needs to be absorbed

[Method Rules] This question is answered using the graphic analysis method. In state A, the water is solid, with a small distance between the molecules, and has a fixed shape. Its volume and shape do not change with the change of the container, so A is correct; in state B, the distance between water molecules is the smallest, and it is liquid water, so B is wrong; the distance between water molecules in state C is the largest and it is in the gaseous state, so the phenomenon of converting from state C to state B is liquefaction, so C is wrong; the change from state B to state A is a solidification process, which will release heat, so D is wrong . It is worth noting that the distance between water molecules is smaller in the liquid state than in the solid state.

Explore Peiyou

13． [High School Entrance Examination·Hebei] Use molecular knowledge to explain the following phenomena. Among them, the reasonable one is ()

A. Water freezes into ice because water molecules stop moving

B． When a deflated table tennis ball is placed in hot water, it bulges because the size of the molecules increases.

C． Water added with sugar becomes sweeter because the molecules are constantly moving irregularly

D． The total volume after mixing 1 L of soybeans and 1 L of water is less than 2 L because there are gaps between the molecules.

[Instructions] Molecules are always in constant motion. A is wrong. A deflated table tennis ball can swell when placed in hot water. This is because the temperature increases and the distance between molecules becomes larger. B is wrong. Adding sugar to water becomes sweeter. It is due to the continuous movement of molecules, C is correct; soybeans are macroscopic substances, which cannot mean that there are gaps between molecules, D is incorrect.

Keywords: May 4th System Lujiao Edition Chemistry 8th Grade PPT Courseware Free Download, Moving Water Molecules PPT Download, Exploring the Water World PPT Download, .PPT format;

For more information about the PPT courseware "Exploring the Water Molecules in Movement in the Water World", please click on the "Exploring the Water Molecules in Movement in the Water World" PPT tag.

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Update Time: 2024-11-25

This template belongs to Chemistry courseware Lu Jiao Edition Ninth Grade Chemistry Volume 1 industry PPT template

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