If 25% of a radioactive element remains after 1,000 years, what is the half-life?

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.

Which terms are used to identify pure substances

How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?