Aluminum is an element. Which best describes what makes up a sample of aluminum?A. One kind of Atom B. Two different kinds of atom C. All carbon-based atoms D. A carbon atom and non-carbon atom

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false

In which reaction is precipitation occurring?