, 12.11.2019 08:31, cuhh

# Imagine that you fill a bucket to the top with water and then place the bucket outside in freezing weather. which of the following describes what will happen when the water in the bucket freezes? a. the level of the water and the bucket itself will not be changed by becoming frozen. b. the level of the water will be lower once it is frozen and the molecules are more compact. c. the sides of the bucket will be pushed out and the level of the water will be above the rim of the bucket.d. the level of the water will be uneven once it is frozen because some water will remain a a liquid in the bucket.

### Other questions on the subject: Chemistry

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Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.