Prove Lavoisier's law (the law on mass maintenance) for the chemical reaction shown by the equation 4Al +3O2 > 2Al2O3 please help​

Identify the missing numbers below to show the result of multiplying the numbers (1.6 × 10-19)(5.0 × 106) = c × 10d

What term describes technology that operates on an atomic level

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures