A scientist heats an unknown substance in a closed system. The graph shows the change in temperature over time. E D Temperature C A Time During which period is the substance changing state? A. During the time labeled D, when the temperature stays the same B. During the time labeled E, when the temperature increases for a third time C. During the time labeled C, when the temperature increases ebarnly

If an atom has 12 protons and 13 neutrons

A20 liter cylinder of helium at a pressure of 150 atm and a temperature of 27°c is used to fill a balloon at 1.00 atm and 37°c. what is the volume of the balloon? a. 0.14 liters b. 3000 liters c. 2900 liters d. 2400 liters e. 3100 liters

In the haber reaction, patented by german chemist fritz haber in 1908, dinitrogen gas combines with dihydrogen gas to produce gaseous ammonia. this reaction is now the first step taken to make most of the world's fertilizer. suppose a chemical engineer studying a new catalyst for the haber reaction finds that 671 liters per second of dinitrogen are consumed when the reaction is run at 271c and 0.99atm. calculate the rate at which ammonia is being produced. give your answer in kilograms per second. round your answer to significant digits.