Which of these chemical equations is already balanced? Select one:
a. Mg + O2 --> MgO
b. Na + H2O > NaOH + H2
c. CaCO3 --> CaO + CO2
d. Na + Cl2 ---> NaCl

Uranium can supply energy for the worlds electricity without admitting harmful greenhouse gases which of these statements best describes an outcome of uranium mining

Oil rich countries in the middle east cover about 4% of earths total land area but prossess about 48% of the worlds known oil reserves what is the main reason for high concentration of reserves in this part of the world

How many moles are contained in 5.6 l of h2 at stp