Which of the following statements is true? Incandescent light bulbs are almost 100 percent efficient.
Endothermic reactions release heat.
Heat is considered "lost" energy because it cannot be used for work.
An electric drill gains energy in the form of heat and sound.

Agas mixture with a total pressure of 745 mmhg contains each of the following gases at the indicated partial pressures: co2, 245 mmhg ; ar, 119 mmhg ; and o2, 163 mmhg . the mixture also contains helium gas. part a what is the partial pressure of the helium gas? phe p h e = nothing mmhg request answer part b what mass of helium gas is present in a 10.2-l sample of this mixture at 283 k ? m m = nothing g request answer

During which time interval does the object travel approximately 10 meters

How many atoms are there in 5.70 mol of mg