Question

Unit 2 & 3: Energy Test
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Question
Possible Points: 1
Two bottles of water are used in an experiment. One bottle is heated and yellow food coloring is added to it. The other bottle is cooled and blue food coloring is added to it.



The yellow bottle is placed on top of the blue bottle so that the liquids in each bottle can touch. After one minute, the liquid in the bottles appears as shown below.



Which of the following ways could the experiment be continued to best illustrate the effects of convection?

Responses

Flip the water bottles upside down so that the blue bottle is on the top and the yellow bottle is on the bottom.
Flip the water bottles upside down so that the blue bottle is on the top and the yellow bottle is on the bottom.

Place the bottles underneath a heat lamp for ten minutes.
Place the bottles underneath a heat lamp for ten minutes.

Pour the water from both bottles into a bowl and use a spoon to stir them together.
Pour the water from both bottles into a bowl and use a spoon to stir them together.

Unstack the bottles and measure the temperature of the yellow bottle and the blue bottle separately.

Answer 1

To best illustrate the effects of convection, the most effective method from the options provided is to **flip the water bottles upside down so that the blue bottle is on the top and the yellow bottle is on the bottom**. This would allow the cooler blue water to rise and the warmer yellow water to sink, which directly demonstrates the convection currents that occur due to temperature differences in liquids.

The other options, such as placing them under a heat lamp or stirring with a spoon, do not effectively illustrate or isolate the convection process as well as flipping the bottles would.