A balloon is filled to a volume of 12.5 l at 25C and 101 kpa how many grams of helium are in the balloon

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together

What is true for a substance that releases energy

8) warming your hands by a fire is an example if which heat transfer? a. conduction b. convection c. radiation d. none of these