Question

4. Activity - Take some solid ice in a beaker. Keep this beaker in the open space in the sun. You see that ice

melts to form water. Now, keeps the beaker containing water, in the freezer. After a few hours, the water in the

beaker freezes to form ice once again.

Write your observation and Conclusion. Take a click while performing this experiment. 5 marks

please tell fast and right
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Answer 1

In this activity, you wanted to test whether these substances could demonstrate freezing point depression, or the lowering of the ice's freezing point so that it melted into a liquid at a lower temperature than normal. You should have seen that the ice cube with salt sprinkled on it melted faster than any of the other cubes. This is because the amount by which the freezing point is lowered depends on the number of molecules dissolved, but not their chemical nature. (This is an example of what's called a "colligative property.") In the same volume there are more molecules of salt than there are of sugar or sand because the chemical components that make up the salt are much smaller than the sugar or sand.

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