aluminum is a highly reactive metal that oxidizes when exposed to air which of these would be a good first step in balancing this reaction?

Answer is in the photo. I can't attach it here, but I uploaded it to a file hosting. link below! Good Luck!

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B) Put a coefficient of 3 on o2

Explanation: According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balancing starts with the maximum number of atoms and thus first oxygen needs to get balanced by putting a coefficient of 3 on reactant side.

mechanics (greek   is that area of science concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment. the scientific discipline has its origins in ancient greece with the writings of aristotle and archimedes[1][2][3] (see history of classical mechanics and timeline of classical mechanics). during the early modern period, scientists such as galileo, kepler, and newton laid the foundation for what is now known as classical mechanics. it is a branch of classical physics that deals with particles that are either at rest or are moving with velocities significantly less than the speed of light. it can also be defined as a branch of science which deals with the motion of and forces on objects. the field is yet less widely understood in terms of quantum theory.

explanation:

it would be d. henry moseley

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