Write in standard notation 9.9275 × 103

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.

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

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