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Authoritative PPT Summary
"Water Frozen" PPT download of changes in temperature and water
Part One: Importing New Knowledge
Want to know what's in this bag?
Come on stage, touch it and tell me how you guessed it?
Water freezes PPT, part 2: new knowledge explanation
1. Observation of Ice
Be careful not to freeze your hands!
Tell us how you feel!
Relatively hard, very smooth, cold, low temperature.
Does ice have color?
You can see through the ice, which is transparent.
Ice has a fixed shape.
Group Activity
Observe ice and water carefully, find their similar and different characteristics, and record them on the table in concise words.
2. At what temperature does water freeze?
Can you turn liquid water into solid ice?
Guess: At what temperature does water freeze?
Water can form ice only at "low temperatures"
Water freezes PPT, part three: knowledge extension
Discuss: After today’s study, do you know why the water in the refrigerator freezes?
Since the temperature in the refrigerator is low, when you put water in the refrigerator, the water releases heat to the surroundings, and the temperature drops. When it drops to 0°C, the state of the water changes and it turns into ice.
Water freezes PPT, Part 4: Consolidation exercises
1. When the temperature of water drops to ( )℃, water begins to freeze. When water freezes, the temperature of the ice-water mixture remains at ( ) ℃ for a long time.
2. Adding some salt to the ice will increase the temperature of the ice ( ).
3. What methods can be adopted to lower the temperature of the ice-water mixture ( )
A. Add water
B. Add salt
C. Add ice
4. The space occupied by ice water after freezing ( )
A. became smaller
B. got bigger
C. No change
Water freezes PPT, Part 5: Class summary
1. Ice and water have something in common: colorless, odorless, and transparent.
2. Characteristics of ice: solid, fixed shape, hard, very smooth, low temperature...
3. Characteristics of water: liquid, no fixed shape, flowing, soft...
4. Water begins to freeze at 0°C; water freezes because of changes in temperature;
Keywords: Free download of Chinese PPT courseware for the second volume of the third grade of the textbook version, PPT download of water freezing, PPT download of changes in temperature and water, .PPT format;
For more information about the PPT courseware "Changes in Temperature and Water - Water Freezes", please click on the "Changes in Temperature and Water - Water Freezes" ppt tag.
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