Answer:
By absorbing energy on evaporation and releasing it on condensation, it keeps water cool when the air is hot and warm when the air is cool.
Probably NO2 because it includes Oxygen in the equation.
That guy is a hacker beware!^
Answer: J
Explanation: when a object hits something it has a equal and opposite reaction pushing it back
Carotenoids are widely known as provitamin A, while there is an increasing interest in their role as antioxidants. For this purpose carrot roots are cut to slices (width 2 mm, length 1 cm). The extraction yield of carotenes is observed at different temperatures (20°C, 40°C, and 60°C) using ethanol and 2-propanol. Initially, 25 g of cut carrot samples are added to 100 g of 96% ethanol. Carrot slices are extracted in water bath (20°C, 40°C, 60°C), shake after every 10 min, and after every hour of extraction 5 ml sample are s taken and mixed with petroleum ether (20 ml). Water is
added for the separation of phases, and after the separation the petroleum-ether-carotenoid phase is made up to the volume of 50 ml.