When 98.4 grams of SiO2 are reacted, 41.4 grams of Si are produced. What is the percent yield of this reaction?
SiO2 + 2 C → Si + 2 CO

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Which of the following statements is true about energy quantization at the atomic level? electrons in the outermost orbits are the most stable. electrons in all the orbits around the nucleus have the same amount of energy. electrons in the orbit closest to the nucleus have the least amount of energy. electrons absorb or release the same amount of energy independent of the energy levels.

Witch two conditions can limit the usefulness of the kinetic molecular theory in describing gas behavior?