"Water Frozen" Changes in the Four Seasons PPT Courseware 2

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"Water Frozen" Changes in the Four Seasons PPT Courseware 2

Do you know water?

Think about it, what does water look like in daily life? Please describe the characteristics of water from some of the following aspects.

The color, smell, taste, state of water, etc.

What are the characteristics of water?

Colorless, no fixed shape

Odorless and flowing

transparent soft

ice

Have you ever seen ice? Under what circumstances does water turn into ice?

What are the characteristics of ice?

Colorless, fixed shape

Odorless and will not flow

transparent hard

Notice

1. Water vapor is water in a gaseous state. Water vapor is a colorless and transparent gas that we cannot see. The white substance that emerges when boiling water is not water vapor, but "water vapor".

2. Water vapor is composed of small droplets formed when water vapor is cooled, so white water vapor is liquid water, not gaseous.

How is frost formed?

Mix some salt and ice in a dark enamel cup. Use a thermometer to measure the temperature of the ice-salt mixture in the cup. Observe what happens on the outer wall of the cup.

What does this experiment show?

It is formed when water vapor in the air is cooled and drops to 0°C.

1. Fill in:

1. The temperature of water when it freezes is the _____ of the water.

2. It takes _____ for ice to turn into water or water vapor.

3. Water has three states: liquid, gas, and solid. Ice is water in the solid state. Water vapor is water in the vapor state.

4. The main factor affecting the changes in the three states of water is ______________.

2. Be a good little judge:

(1) The three states of liquid, gaseous and solid water can transform into each other under certain conditions. ( )

(2) Water vapor can directly turn into ice, but ice cannot directly turn into water vapor. ( )

(3) Put a piece of ice there and it will never decrease as long as it does not turn into water. ( )

(4) Under normal circumstances, water can freeze at 0°C and below. ( )

(5) The three-state changes of water are very closely related to our lives. ( )

expand:

1. In the early morning before and after the winter solstice, ice flowers often appear on the inside of bedroom windows. What is the reason?

Answer: In the early morning before and after the winter solstice, the outdoor temperature is mostly below 0°C, while the indoor temperature is above 0°C. When the warm and humid indoor water vapor encounters cold, it will freeze on the cold windows and form frost flowers.

2. Fill in the blanks

Frost flowers are formed when ( ) in the air is cooled and drops to 0°C; ( ) is formed when water vapor is cooled

3. Under what conditions do the three states of water occur? This is represented in the figure below.

4. How is frost formed? How did you conduct this experiment?

Answer: It is formed when water vapor in the air is cooled and drops to 0°C.

I did this experiment: put some ice in an enamel with a dark outer wall, and then sprinkle some salt and mix it with the ice. After a while, we will find that white frost will appear on the outer wall of the cup.

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For more information about the PPT courseware "Water Frozen and Changes in Four Seasons", please click the "Water Frozen and Changes in Four Seasons" ppt tag.

"Water Frozen" PPT download of changes in temperature and water:

"Water Frozen" PPT Download of Changes in Temperature and Water Part One: Introduction of New Knowledge Do you want to know what is in this bag? Come on stage, touch it and tell me how you guessed it? ... ... ... Water freezes PPT, part 2: new knowledge explained...

"Water Frozen" Changes in Temperature and Water PPT:

"Water Frozen" PPT on Changes in Temperature and Water Part One: Observation of Ice Take some ice cubes and observe them carefully. What color is ice? Can you see other objects through the ice? Do ice cubes have a fixed shape? How does it feel when you touch an ice cube with your hand? ... ..

"Water Frozen" PPT courseware on changes in the four seasons:

"Water Frozen" PPT courseware on changes in the four seasons Do you understand water? Think about it, what does water look like in daily life? Please describe the characteristics of water from some of the following aspects. The color, smell, taste, state of water, etc. Ice Have you ever seen ice? what's the situation..

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Update Time: 2024-11-22

This template belongs to science courseware E-education edition sixth grade science volume 1 industry PPT template

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