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"The Ice Melts" Changes in Temperature and Water PPT Download
Part One: Importing New Knowledge
Under what conditions can ice turn into water?
Liquid water will solidify into ice below 0°C, so can solid ice turn into liquid water again?
The ice melted PPT, part 2: new knowledge explanation
1. Observe the melting of ice
Do you know the temperature of ice cubes freshly taken out of the refrigerator?
1. Temperature changes when ice melts
The temperature at which ice melts without any disturbance.
(1) Experimental steps:
①Insert the thermometer into the crushed ice. Use a thermometer to measure and record the temperature of the ice cubes.
② Record the temperature of the ice cube every one minute.
③If you observe that the ice cube has completely melted, record the reading of the thermometer.
Experimental requirements
①. The thermometer should be fixed in one position during testing.
②. Read the temperature of the thermometer every 1 minute, report it in order, and the recorder will record it in time.
③. Keep quiet during the experiment for 5 minutes.
2. Study the temperature of the surrounding air when ice melts
(1) Measure the air temperature in the beaker;
(2) Measure the air temperature close to the outer wall of the beaker;
(3) Measure the air temperature away from the ice.
Experimental conclusion: When the ambient temperature exceeds 0°C, ice can be caused to melt;
During the melting process of ice, the temperature is always maintained at 0℃;
Through measurements, we know that the temperature of the air next to the ice cubes has dropped because the melting process of the ice cubes continues to absorb heat from the surrounding air.
2. Speed up the melting of ice
Please discuss in groups. Is there any way you can make the ice melt faster?
1. Group experiment:
(1) Method: Each group puts a piece of ice into a plastic bag, and the mouth of the bag should be sealed. Compare which group of ice melts faster.
(2) Experimental process: Method to quickly melt ice cubes
Group 1: Pour cold water into the beaker and put the ice cubes in;
Group 2: Pour hot water into the beaker and put ice cubes in;
Group 3: Crush an ice cube with a hammer and put it into hot water;
The ice melted PPT, part three: consolidation exercises
1. The reason why ice cubes melt when placed on the experimental table is ().
A． The indoor temperature is high
B. Ice cubes are smaller
C. The table generates heat.
2. Raising the temperature around the ice cube will cause ( ).
A． Ice cubes melt slower
B. Ice cubes melt faster
C. The rate at which the ice cubes melt has not changed
3. The following method to speed up the melting of ice cubes is ().
A． Break the ice cubes
B. Keep ice cubes in a dry environment
C. Breathe hot air into the ice cube with your mouth
D． Wrap the ice cube in a quilt
The ice melted PPT, part 4 content: Class summary
1. When the ambient temperature exceeds 0℃, the ice will melt; during the melting process of ice, the temperature will always remain at 0℃;
2. The melting process of ice cubes requires continuous absorption of heat from the surrounding air.
3. The higher the temperature, the smaller the ice cubes will be and the faster they will melt.
Keywords: Free download of Chinese PPT courseware for the second volume of the third grade of the textbook version, PPT download of ice melting, PPT download of changes in temperature and water, .PPT format;
For more information about the "Changes in Temperature and Water Ice Melts" PPT courseware, please click on the Changes in Temperature and Water ppt Ice Melts ppt tag.
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