3Fe3O4 + 8Al = 4Al2O3 + 9Fe ... why is Fe 9

Balance the reaction for the combustion of pentane:? C5H12+? O2→? CO2+? H2O Enter the four coefficients in order, separated by commas (e. G., 1,2,3,4), where 1 indicates the absence of a coefficient.

Am231 has a half-life of 432.2 years. it is used smoke detectors in household detectors. The smoke detector in your home has this radioactive product in it. Why do we use radioactive Am231 in our homes?

Juan freezes a bottle of water to ice (500. ml) in preparation for a road trip. how much heat can be absorbed by that ice before it is fully melted?

2 kg nitrogen reacts with 1 kg hydrogen. calculate the mass of ammonia

In the PhET activity, "Properties of Gases", when volume is kept the same, as the temperature is increased A. the rate of collisions increases B. the pressure decreases C. the rate of collisions decreases D. none of these are correct

The following mechanism has been proposed for the gas-phase reaction of chloroform (CHCl3) and chlorine.

Catherine has some seawater. She wants to separate pure water from the seawater. She sets up the apparatus shown in the diagram below. Name the change of state that occurs at the surface of the seawater. It is a distillation diagram

Elements in the noble gas family are considered stable because

A house cat with a mass of 3.0 kg runs at a constant rate of 4.0 m/s in a straight line. What is the momentum of the cat?

Planet z-34 has a mass equal to 1/3 that of earth, a radius equal to 1/3 that of earth, and an axial spin rate 1/2 that of earth.