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"Water Frozen" PPT Courseware 2 on Changes in Temperature and Water
The cold winter has just passed. I wonder if you have noticed what changes have happened to the water around us during the cold winter?
ice observation
What color is ice?
Can you see other objects through the ice?
Do ice cubes have a fixed shape?
Ice is colorless.
You can see that the ice is transparent.
Ice has a fixed shape
Characteristics of ice
Relatively hard, very smooth, low temperature, easy to melt, ice cubes will float on water, ice is solid
Characteristics of water
A liquid that flows and has no fixed shape
Experiment as follows:
1. Put ice cubes in the cup and measure the temperature of the ice
2. Add table salt into the cup and measure the temperature after the ice and salt are mixed.
3. Insert a test tube containing a small amount of water into the ice and salt mixture. When ice appears in the test tube, measure the temperature in the test tube.
Report and exchange:
1. At what temperature does water freeze?
Answer: Water will freeze at 0℃ and change from liquid to solid.
2. What caused the state of water to change?
Answer: Changes in temperature cause the state of water to change.
judge
1. As long as winter comes, ice can be seen everywhere. ( )
2. During the freezing process, water releases heat to the surroundings. ( )
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