4 Al(s) + 3 O2(g) 2 Al2O3(s) In the reaction of aluminum with oxygen shown above, which substance is reduced?
A. aluminum
B. oxygen
C. aluminum oxide
D. NONE of the above

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

Frictional forces acting on an object are often converted into energy, which causes the temperature of the object to rise slightly.

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.