A student conducted an experiment to determine how the freezing point of water is affected when sugar is added to the water. He used three beakers, each filled with 1 cup of water. He added 3 teaspoons of sugar in the first beaker of water, 1 teaspoon of sugar in the second, and no sugar in the last beaker. He then cooled each beaker of water and recorded the freezing temperatures. 1. What is the control in this experiment? ___2. What is the independent variable?___ 3. What is the dependent variable?___

The control in this experiment is the temperature of the water.

The independent variable is the amount of sugar that is put in.

The dependant variable in this experiment is when the water freezes.

Explanation:

the answer is na (sodium)

on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.