How many ELEMENTS are in Mg + 2HCl → H2 + MgCl2

Which of the following statements is true? question 4 options: nuclear decay rates vary with the conditions of the reaction, but chemical reaction rates do not. chemical reaction rates vary with the conditions of the reaction, but nuclear decay rates do not. neither chemical reaction rates nor nuclear decay rates vary with the conditions of the reaction. both chemical reaction rates and nuclear decay rates vary with the conditions of the reaction.

What is a number added in front of a formula in order to balance the equation

List and describe the neurological effects of the vocs and other air pollutants,as described by dr.theo colborn