When octane is burned in air, it chemically reacts with oxygen gas o2 to produce carbon dioxide co2 and water h2o ?

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

A5 mole sample of liquid acetone is converted to a gas at 75.0°c. if 628 j are required to raise the temperature of the liquid to the boiling point, 15.600 kj are required to evaporate the liquid, and 712 j are required to raise the final temperature to 75.0°c, what is the total energy required for the conversion?

What is the source of continuous heat and energy that we receive from the sun